A main driving sealing system of a heading machine and the main driving of the heading machine

Abstract

This invention belongs to the technical field of underground tunnel construction equipment, specifically providing a main drive sealing system for a tunnel boring machine (TBM) and a main drive system for the TBM. The system includes a first sealing structure and a second sealing structure. The first sealing structure comprises a first sealing body, a first sealing ring, and a support mechanism. One side of the first sealing body is connected to the cutterhead flange in the TBM via the first sealing ring, and the other side of the first sealing body is connected to the shield body in the TBM via the support mechanism, thereby achieving a seal between the cutterhead flange and the shield body. The second sealing structure comprises a second sealing body and a second sealing ring. One side of the second sealing body is in contact with the outer surface of the flange, and the other side of the second sealing body is connected to a fixed seat via the second sealing ring, thereby achieving a seal between the flange and the fixed seat. This invention can actively adjust the relative position of the sealing components and flexibly change their adjustment amount, improving the service life and safety performance of the main drive sealing system.

Description

Technical Field

[0001] This invention belongs to the technical field of underground tunnel construction equipment, and relates to a main drive sealing system for a tunnel boring machine and a main drive for the tunnel boring machine. Background Technology

[0002] During tunnel construction, there are numerous cases of work stoppages, idle time, and even equipment paralysis leading to route rerouting due to damage to key components of tunneling equipment such as tunnel boring machines. Among these, damage to the main drive sealing system is the most prominent. This damage allows foreign objects to enter the drive box, causing damage to critical components such as the main bearing, self-aligning bearing, and pinion gear. This poses a significant construction risk to tunnel construction and is one of the most pressing problems that the industry needs to solve.

[0003] Currently, the main drive sealing system is generally designed to consist of multiple rings installed on the flange or in its cavity and multiple seals that are fixed to it. This structure has the following defects: (1) Once it fails or is damaged in the hole, the rings and seals assembled in each axis need to be disassembled and reassembled one by one from the inside of the main drive sealing system, which affects the work efficiency; (2) Since the seals are fixed, the position of the seals cannot be actively adjusted and the sealing rings need to be passively adjusted to avoid the wear position. This operation is prone to secondary oil leakage, and after the operation, the seals need to be added to improve the sealing performance after adjustment; (3) The need to disassemble and adjust the sealing rings for a long time during the shutdown operation is very likely to bring construction risks, and the nearby strata need to be reinforced, which increases the construction cost; (4) It is inconvenient for manual operation to disassemble and assemble multiple rings and seals in a limited space. Summary of the Invention

[0004] This invention aims to provide a tunneling machine main drive sealing system and tunneling machine main drive that solves the problem of having to disassemble and assemble multiple parts and seals multiple times during operations such as replacement and adjustment of the main drive sealing system inside the tunnel, and the inability to actively and flexibly adjust the seals.

[0005] This invention provides a main drive sealing system for a tunneling machine, comprising a first sealing structure and a second sealing structure; The first sealing structure is disposed between the main drive of the tunneling machine and the shield of the tunneling machine, and the first sealing structure includes a first sealing body, a first sealing ring and a support mechanism; the first sealing body extends along the central axis of the main drive of the tunneling machine, one side end face of the first sealing body is connected to the cutterhead flange in the tunneling machine through the first sealing ring, and the other side end face of the first sealing body is connected to the shield of the tunneling machine through the support mechanism, so as to achieve sealing between the cutterhead flange and the shield; The second sealing structure is disposed between the flange in the main drive of the tunneling machine and the fixed seat in the main bearing of the tunneling machine, and the second sealing structure includes a second sealing body and a second sealing ring; the second sealing body extends along the central axis of the main drive of the tunneling machine, one side end face of the second sealing body is in contact with the outer surface of the flange, and the other side end face of the second sealing body is connected to the fixed seat through the second sealing ring to achieve sealing between the flange and the fixed seat.

[0006] Furthermore, the first sealing body includes a first sealing element and a second sealing element that are spaced apart from each other; The first seal and the second seal are spaced apart from each other along the central axis of the main drive of the tunneling machine, and a first sealing gasket is provided between the first seal and the second seal.

[0007] Furthermore, the first sealing structure also includes a first sealing fastener disposed on the side of the first sealing member away from the second sealing member, a first sealing gasket disposed on the side of the second sealing member away from the first sealing member, and a first sealing screw for connecting the first sealing fastener, the first sealing member, the first sealing gasket, the second sealing member and the first sealing gasket. The first sealing fastener is configured as a nut structure that is helically connected to the first sealing screw; The end of the first sealing ring away from the second sealing element is connected in contact with the end face of the main bearing in the main drive of the tunneling machine.

[0008] Furthermore, both the first sealing gasket and the first sealing ring are configured as elastic structural components to ensure compression sealing of the first sealing element and the second sealing element.

[0009] Furthermore, the second sealing body includes a third sealing element and a fourth sealing element disposed at intervals from each other; The third and fourth seals are spaced apart from each other along the central axis of the main drive of the tunneling machine, and a second sealing gasket is provided between the third and fourth seals.

[0010] Furthermore, the second sealing structure also includes a second sealing fastener disposed on the side of the third sealing member away from the fourth sealing member, a second sealing gasket disposed on the side of the fourth sealing member away from the third sealing member, and a second sealing screw for connecting the second sealing fastener, the third sealing member, the second sealing gasket, the fourth sealing member, and the second sealing gasket. The second sealing fastener is configured as a nut structure that is helically connected to the second sealing screw; The end of the second sealing ring away from the fourth sealing element is in contact with the end face of the drive box in the main drive of the tunneling machine.

[0011] Furthermore, both the second sealing gasket and the second sealing ring are configured as elastic structural components to ensure the compression sealing of the third and fourth sealing elements.

[0012] Furthermore, the first seal, the second seal, the third seal, and the fourth seal have the same structure, each including a sealing body and a first set of sealing lips and a second set of sealing lips disposed on the sealing body. The first set of sealing lips and the second set of sealing lips are configured to be symmetrically arranged along the central axis of the sealing body.

[0013] Furthermore, the first set of sealing lips includes at least two pieces spaced apart from each other along the central axis of the sealing body. One end of each sealing lip is integrally formed with the sealing body, and the other end of each sealing lip extends in an inclined manner.

[0014] As a further aspect of the present invention, the present invention also provides a main drive for a tunneling machine, including a main bearing, an internal gear ring, gears, a power unit, a flange, a drive box, a cutterhead flange, a cutterhead, a cutterhead bracket, a shield body, a fixed base, and a tunneling machine main drive sealing system as described above. The main bearing is provided with an external gear ring and an internal gear ring. The internal gear ring meshes with a gear. The gear is located in the drive box and connected to the power unit. The power unit provides a power source for the gear. The flange connects the internal gear ring and the cutter head flange, and is used to transmit the power source of the power unit to the cutter head flange; The cutter head is mounted on the cutter head flange via a cutter head bracket. The support mechanism in the first sealing structure is connected to the shield body, and the first sealing ring in the first sealing structure is connected to the cutterhead flange. The side end face of the second sealing body away from the second sealing ring in the second sealing structure is connected to the flange in contact, and the second sealing ring in the second sealing structure is connected to the fixed seat.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The main drive sealing system of the tunneling machine provided by the present invention adopts a maintainable design concept and a system design that is easy to disassemble and assemble, which improves the operability of the operation and further ensures the safety of equipment and personnel. The design can disassemble and assemble multiple sealing rings (first sealing ring and second sealing ring) and sealing elements (first sealing body and second sealing body) at one time, and perform separate disassembly and assembly operations outside the main drive sealing system, saving operation time and reducing construction costs. The design can actively adjust the relative position of the sealing elements and flexibly change their adjustment amount, thereby improving the service life and safety performance of the main drive sealing system.

[0016] (2) This invention proposes a main drive sealing system for a tunneling machine and a tunneling machine having the same, which can simultaneously disassemble and assemble multiple rings and seals, actively adjust the relative positions of the seals, and flexibly change their adjustment amount; it adopts a maintainable design concept and a system design that facilitates flexible disassembly and assembly, improving operational feasibility and further ensuring equipment and personnel safety. According to the method described in this invention, the interfaces, materials, seals, and the number of their sub-components in the proposed solution can be freely changed according to different materials and forms.

[0017] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a tunneling machine main drive sealing system according to Embodiment 1 of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure of the first outer seal.

[0019] in: 1. First sealing gasket; 2. First sealing fastener; 3. First sealing element; 3.1. Sealing body; 3.2. First set of sealing lips; 3.3. Second set of sealing lips; 4. First sealing ring; 5. Second sealing element; 6. First sealing screw; 7. First sealing gasket; 8. Support mechanism; 9. Main bearing; 10. Internal gear ring; 11. Gear; 12. Power unit; 13. Tunneling machine main bearing flange; 14. Drive box; 15. Second sealing fastener; 16. Second sealing screw; 17. Second sealing ring; 18. Second sealing gasket; 19. Third sealing element; 20. Fourth sealing element; 21. Second sealing gasket; 22. Cutterhead flange; 23. Cutterhead; 24. Cutterhead bracket. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of the present invention clearer and easier to understand, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the accompanying drawings of the present invention are all in a simplified form and use non-precise proportions, and are only used to facilitate and clearly assist in illustrating the implementation of the present invention; the "several" mentioned in the present invention are not limited to the specific number shown in the examples in the accompanying drawings; the orientations or positional relationships indicated by terms such as "front," "middle," "rear," "left," "right," "up," "down," "top," "bottom," and "center" mentioned in the present invention are all based on the orientations or positional relationships shown in the accompanying drawings of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, nor should they be construed as limitations on the present invention.

[0021] Example 1: See Figure 1 and Figure 2 As shown, the main drive sealing system for a tunneling machine provided by the present invention includes a first sealing structure and a second sealing structure. The first sealing structure is disposed between the main drive of the tunneling machine and the shield body of the tunneling machine, and the first sealing structure includes a first sealing body, a first sealing ring 4 and a support mechanism 8; the first sealing body extends along the central axis of the main drive of the tunneling machine, one side end face of the first sealing body is connected to the cutterhead flange in the tunneling machine through the first sealing ring 4, and the other side end face of the first sealing body is connected to the shield body in the tunneling machine through the support mechanism 8, so as to achieve sealing between the cutterhead flange and the shield body; The second sealing structure is disposed between the flange in the main drive of the tunneling machine and the fixed seat in the main bearing of the tunneling machine, and the second sealing structure includes a second sealing body and a second sealing ring 17; the second sealing body extends along the central axis of the main drive of the tunneling machine, one side end face of the second sealing body is in contact with the outer surface of the flange, and the other side end face of the second sealing body is connected to the fixed seat through the second sealing ring 17 to achieve sealing between the flange and the fixed seat.

[0022] As a further embodiment of this invention, the first sealing body includes a first sealing element 3 and a second sealing element 5 that are spaced apart from each other. The first sealing element 3 and the second sealing element 5 are spaced apart from each other along the central axis of the main drive of the tunneling machine, and a first sealing gasket 1 is provided between the first sealing element 3 and the second sealing element 5.

[0023] Preferably, in this embodiment, the first sealing element 3 and the second sealing element 5 have the same structure. Taking the first sealing element 3 as an example, see [link to example]. Figure 2 As shown, it includes a sealing body 3.1 and a first set of sealing lips 3.2 and a second set of sealing lips 3.3 disposed on the sealing body 3.1; The first set of sealing lips 3.2 and the second set of sealing lips 3.3 are each provided with at least two sealing lips that are spaced apart from each other along the central axis of the sealing body 3.1. One end of each sealing lip is integrally formed with the sealing body 3.1, and the other end of each sealing lip extends in an inclined manner away from the sealing body 3.1.

[0024] In a further preferred embodiment, the angle between the single sealing lip and the central axis of the sealing body 3.1 is set to 30-60 degrees, which effectively ensures its sealing performance by tilting.

[0025] As a further embodiment, in order to achieve the mutual connection between the first sealing member 3 and the second sealing member 5, the first sealing structure further includes a first sealing fastener 2 disposed on the side of the first sealing member 3 away from the second sealing member 5, a first sealing gasket 7 disposed on the side of the second sealing member 5 away from the first sealing member 3, and a first sealing screw 6 for connecting the first sealing fastener 2, the first sealing member 3, the first sealing gasket 1, the second sealing member 5 and the first sealing gasket 7. The first sealing fastener 2 is configured as a nut structure that is helically connected to the first sealing screw 6; The end of the first sealing ring 7 away from the second sealing element 5 is connected in contact with the end face of the main bearing in the main drive of the tunneling machine.

[0026] Preferably, in this embodiment, both the first sealing gasket 1 and the first sealing ring 7 are configured as elastic structural members to ensure the compression sealing of the first sealing member 3 and the second sealing member 5.

[0027] Preferably, in this embodiment, a plurality of threaded holes are arranged on the first sealing ring 4 for flexibly assembling and fixing the outer sealing screw 6 of the first sealing gasket 1, the first sealing element 3, and the second sealing element 5.

[0028] In a further preferred embodiment, the first sealing screw 6 has internal hexagon heads at both ends, which facilitates flexible and arbitrary assembly of both ends.

[0029] In a further preferred embodiment, the first sealing fastener 2 is provided with a locking device, which is assembled on the outer sealing screw 6 to further enhance the tightness of the outer sealing gasket 1, the first outer seal 3, and the second outer seal 5.

[0030] As a further embodiment, in this embodiment, the second sealing body includes a third sealing member 19 and a fourth sealing member 20 that are spaced apart from each other; The third seal 19 and the fourth seal 20 are spaced apart from each other along the central axis of the main drive of the tunneling machine, and a second sealing gasket 18 is provided between the third seal 19 and the fourth seal 20.

[0031] Preferably, in this embodiment, the structures of the third sealing element 19 and the fourth sealing element 20 are consistent with the structure of the first sealing element 3.

[0032] Preferably, in this embodiment, in order to achieve the interconnection between the third seal 19 and the fourth seal 20, the second sealing structure further includes a second sealing fastener 15 disposed on the side of the third seal 19 away from the fourth seal 20, a second sealing gasket 21 disposed on the side of the fourth seal 20 away from the third seal 19, and a second sealing screw 16 for connecting the second sealing fastener 15, the third seal 19, the second sealing gasket 18, the fourth seal 20 and the second sealing gasket 21; The second sealing fastener 15 is configured as a nut structure that is helically connected to the second sealing screw 16; The end of the second sealing ring 21 away from the fourth sealing element 20 is in contact with the end face of the drive box in the main drive of the tunneling machine.

[0033] Preferably, in this embodiment, the second sealing gasket 18 and the second sealing ring 21 are both configured as elastic structural members to ensure the compression sealing of the third sealing member 19 and the fourth sealing member 20.

[0034] Preferably, in this embodiment, a plurality of threaded holes are arranged on the second sealing ring 21 for flexibly assembling and fixing the second sealing screw 16 of the second sealing gasket 18, the third sealing element 19, and the fourth sealing element 20.

[0035] In a further preferred embodiment, both ends of the second sealing screw 16 are provided with internal hexagon heads, which facilitates flexible and arbitrary assembly of both ends.

[0036] In a further preferred embodiment, a locking device is provided on the second sealing fastener 15 and assembled on the second sealing screw 16 to further enhance the tightness of the second sealing gasket 18, the third sealing element 19, and the fourth sealing element 20.

[0037] As a further embodiment, in order to effectively ensure the locking force of the first sealing screw 6 and the second sealing screw 16, the threads of the first sealing screw 6 are opposite to those of the first sealing washer 1 and the first sealing fastener 2; the threads of the second sealing screw 16 are opposite to those of the second sealing fastener 15 and the second sealing washer 18; the threads of the first sealing washer 1 and the first sealing fastener 2 are in the same direction; and the threads of the second sealing fastener 15 and the second sealing washer 18 are in the same direction.

[0038] As a further embodiment, taking the replacement of the outer seal as an example, a method for replacing and adjusting the outer seal in a confined space such as an underground construction tunnel is as follows: S1: After ensuring the stability of the strata and the availability of working conditions, conduct safety training for the relevant personnel and allow them to open the chamber and enter the intended working space to clean up any foreign objects near the first sealing element 3.

[0039] S2: Record the distance between the outer end face of the first sealing screw 6 and the outer end face of the first sealing washer 1, and record the distance between the outer end face of the first sealing screw 6 and the end face of the support mechanism 8. Use an Allen wrench, extension wrench / hydraulic wrench / electric wrench / pneumatic wrench to completely remove the first sealing screw 6. The sub-components assembled on it: the first sealing washer 1, the first sealing element 3, and the second sealing element 5 will be completely removed together. Record the axial distance between the screw and each washer. Take care to prevent foreign objects from entering the sealing cavity.

[0040] S3: After the first sealing screw 6, the first sealing gasket 1, the first sealing element 3, and the second sealing element 5 are separated from the main drive sealing system, they are removed in sequence.

[0041] S4: Install the first sealing screw 6, first sealing washer 1, first sealing element 3, and second sealing element 5 as a whole assembly on the outside of the main drive sealing system in their front-to-back positional relationship. Apply the same type of oil as the inside of the drive housing to the outer surface of the first sealing element 3 and the second sealing element 5. Ensure that a certain assembly clearance is maintained between each component and record it. Note that the axial distance between the screw and each washer should be recorded as in S2.

[0042] S5: Using a cross-symmetrical, step-by-step method, evenly install the first sealing screw 6, first sealing washer 1, first sealing element 3, and second sealing element 5 assembly into place. Install them in place according to the distance and positional relationship between the outer end face of the first sealing screw 6 and the outer end face of the first sealing washer 1, and between the outer end face of the first sealing screw 6 and the end face of the support mechanism 8, as recorded in S2.

[0043] Preferably, the number of first sealing gaskets 1 can be changed, and gaskets of different thicknesses can be made. The relative position of the outer seal can be actively and flexibly adjusted. The new installation position after adjustment can be simulated from the drawings and compared with the data recorded in S2 and S4.

[0044] Preferably, S4 can be flexibly adjusted as follows: the first sealing screw 6, the first sealing gasket 1, the first sealing element 3, and the second sealing element 5 are first installed in a separated state, along with the second sealing element 5 and the corresponding front and rear gaskets, and then the first sealing element 3 and the first sealing fastener 2 are installed.

[0045] Similarly, the same operations described above can be performed on the inner seal.

[0046] Preferably, when the inner seal does not directly contact the excavation chamber, i.e., during normal pressure operation, step S1, the chamber opening operation, can be skipped. However, safety training for personnel and cleaning work around the third seal 19 are still required.

[0047] Example 2: The present invention also provides a main drive for a tunneling machine, including a main bearing 9, an internal gear ring 10, a gear 11, a power unit 12, a flange 13, a drive box 14, a cutterhead flange 22, a cutterhead 23, a cutterhead bracket 24, a shield body, a fixed base, and a sealing system for the main drive of the tunneling machine as described in claim 9. The main bearing 9 is provided with an outer gear ring and an inner gear ring 10. The inner gear ring 10 meshes with the gear 11. The gear 11 is located in the drive box 14 and connected to the power unit 12. The power unit 12 provides a power source for the gear 11. The flange 13 connects the internal gear ring 10 and the cutter head flange 22, and is used to transmit the power source of the power unit 12 to the cutter head flange 22. The cutter head 23 is mounted on the cutter head flange 22 via the cutter head bracket 24; The support mechanism in the first sealing structure is connected to the shield body, and the first sealing ring in the first sealing structure is connected to the cutterhead flange 22. The side end face of the second sealing body away from the second sealing ring 17 in the second sealing structure is in contact with the flange 13, and the second sealing ring 17 in the second sealing structure is connected to the fixed seat. The power unit 12 drives the gear 11, which meshes with the internal gear ring 10 on the main bearing 9, further driving the flange 13 and the first sealing ring 4 fixed thereon, and then the cutterhead flange 22, cutterhead bracket 24 and cutterhead 23 fixed on the flange 13, thereby providing torque power to the tunneling machine.

[0048] Preferably, multiple power units 12 are provided, and multiple power units 12 are fixedly arranged in the drive box 14.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A main drive sealing system for a tunneling machine, characterized in that, Includes a first sealing structure and a second sealing structure; The first sealing structure is disposed between the main drive of the tunneling machine and the shield of the tunneling machine, and the first sealing structure includes a first sealing body, a first sealing ring (4) and a support mechanism (8); the first sealing body extends along the central axis of the main drive of the tunneling machine, one side end face of the first sealing body is connected to the cutterhead flange in the tunneling machine through the first sealing ring (4), and the other side end face of the first sealing body is connected to the shield of the tunneling machine through the support mechanism (8) to achieve sealing between the cutterhead flange and the shield; The second sealing structure is disposed between the flange in the main drive of the tunneling machine and the fixed seat in the main bearing of the tunneling machine, and the second sealing structure includes a second sealing body and a second sealing ring (17); the second sealing body extends along the central axis of the main drive of the tunneling machine, one side end face of the second sealing body is in contact with the outer surface of the flange, and the other side end face of the second sealing body is connected to the fixed seat through the second sealing ring (17) to achieve sealing between the flange and the fixed seat.

2. The main drive sealing system for a tunneling machine according to claim 1, characterized in that, The first sealing body includes a first sealing element (3) and a second sealing element (5) that are spaced apart from each other; The first seal (3) and the second seal (5) are spaced apart from each other along the central axis of the main drive of the tunneling machine, and a first sealing gasket (1) is provided between the first seal (3) and the second seal (5).

3. The main drive sealing system for a tunneling machine according to claim 2, characterized in that, The first sealing structure further includes a first sealing fastener (2) disposed on the side of the first sealing member (3) away from the second sealing member (5), a first sealing gasket (7) disposed on the side of the second sealing member (5) away from the first sealing member (3), and a first sealing screw (6) for connecting the first sealing fastener (2), the first sealing member (3), the first sealing gasket (1), the second sealing member (5) and the first sealing gasket (7). The first sealing fastener (2) is configured as a nut structure that is helically connected to the first sealing screw (6); The end of the first sealing ring (7) away from the second seal (5) is in contact with the end face of the main bearing in the main drive of the tunneling machine.

4. The main drive sealing system for a tunneling machine according to claim 3, characterized in that, The first sealing gasket (1) and the first sealing ring (7) are both set as elastic structural components to ensure the compression seal of the first sealing element (3) and the second sealing element (5).

5. The main drive sealing system for a tunneling machine according to any one of claims 2-4, characterized in that, The second sealing body includes a third sealing element (19) and a fourth sealing element (20) arranged at intervals from each other; The third seal (19) and the fourth seal (20) are spaced apart from each other along the central axis of the main drive of the tunneling machine, and a second sealing gasket (18) is provided between the third seal (19) and the fourth seal (20).

6. The main drive sealing system for a tunneling machine according to claim 5, characterized in that, The second sealing structure further includes a second sealing fastener (15) disposed on the side of the third seal (19) away from the fourth seal (20), a second sealing gasket (21) disposed on the side of the fourth seal (20) away from the third seal (19), and a second sealing screw (16) for connecting the second sealing fastener (15), the third seal (19), the second sealing gasket (18), the fourth seal (20), and the second sealing gasket (21). The second sealing fastener (15) is configured as a nut structure that is helically connected to the second sealing screw (16); The end of the second sealing ring (21) away from the fourth seal (20) is in contact with the end face of the drive box in the main drive of the tunneling machine.

7. The tunneling machine main drive sealing system according to claim 6, characterized in that, The second sealing gasket (18) and the second sealing ring (21) are both configured as elastic structural components to ensure the compression seal of the third sealing element (19) and the fourth sealing element (20).

8. The main drive sealing system for a tunneling machine according to claim 5, characterized in that, The first sealing element (3), the second sealing element (5), the third sealing element (19) and the fourth sealing element (20) have the same structure, each including a sealing body and a first set of sealing lips and a second set of sealing lips disposed on the sealing body; The first set of sealing lips and the second set of sealing lips are configured to be symmetrically arranged along the central axis of the sealing body.

9. The main drive sealing system for a tunneling machine according to claim 8, characterized in that, The first set of sealing lips includes at least two pieces that are spaced apart from each other along the central axis of the sealing body. One end of each sealing lip is integrally formed with the sealing body, and the other end of each sealing lip extends in an inclined manner.

10. A main drive for a tunneling machine, characterized in that, Includes main bearing (9), internal gear ring (10), gear (11), power unit (12), flange (13), drive box (14), cutterhead flange (22), cutterhead (23), cutterhead bracket (24), shield body, fixed seat, and the tunneling machine main drive sealing system as described in claim 9; The main bearing (9) is provided with an outer gear ring and an inner gear ring (10). The inner gear ring (10) meshes with the gear (11). The gear (11) is located in the drive box (14) and connected to the power unit (12). The power unit (12) provides a power source for the gear (11). The flange (13) connects the internal gear ring (10) and the cutter head flange (22) and is used to transmit the power source of the power unit (12) to the cutter head flange (22); The cutter head (23) is mounted on the cutter head flange (22) via the cutter head bracket (24); The support mechanism in the first sealing structure is connected to the shield body, and the first sealing ring in the first sealing structure is connected to the cutterhead flange (22); The side end face of the second sealing body away from the second sealing ring (17) in the second sealing structure is in contact with the flange (13), and the second sealing ring (17) in the second sealing structure is connected to the fixed seat.

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