Sealing runway, main drive sealing system and heading machine

Abstract

The utility model discloses a sealing runway, a main drive sealing system and a heading machine, the sealing runway comprises a runway base body, a groove is arranged on a revolution surface of the runway base body, a grinding ring is arranged in the groove, and the grinding ring comprises a plurality of grinding links which are connected end to end. The main drive sealing system comprises the sealing runway, and the heading machine comprises the main drive sealing system. According to the technical scheme provided by the utility model, the grinding ring in the sealing runway is of a sectional structure, and after the grinding ring is completely scrapped, an electric grinder or a cutting machine can be used for cutting off an old grinding ring and welding a new grinding ring, so that the repairing difficulty is greatly reduced, and a positive effect on improving the tunnel construction efficiency is achieved. In addition, the sealing runway provided by the utility model not only can be used for a main driving sealing system, but also can be used for sealing other rotating pairs; the main drive sealing system provided by the utility model not only can be used for the heading machine, but also can be used for other equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to a sealed runway, a main drive sealing system and a tunneling machine. Background Art

[0002] The main drive sealing system of the tunnel boring machine is an important structure to ensure the normal operation of the main drive and the normal excavation of the equipment. The sealing runway is a key component of the main drive sealing system. If it fails due to wear, the equipment will be shut down for maintenance, which seriously affects the progress of tunnel construction. Therefore, in the actual design, how to increase the effective working time of the sealing runway and reduce the difficulty of repairing it in the tunnel after wear becomes the design focus.

[0003] In the prior art, an invention patent application with an application publication date of 2020.07.31 and application publication number CN111473118A discloses an automatic adjustment device for a main drive sealed runway, including a sealed runway, wherein the sealed runway is axially movably connected to a drive disc, and an axial adjustment unit is provided between the sealed runway and the drive disc. This technical solution can stagger the grinding position during the operation of the main drive and increase the effective working time of the sealed runway, but the invention cannot achieve flexible adjustment, and the variable size is single, while the actual wear size of the sealed runway is difficult to control, so the invention is not reliable enough. In addition, the sealed runway can only be repaired by traditional repair methods after damage, that is, welding and grinding along the worn position. The welding amount is large, the runway is easy to deform, and the welding cycle is long. Especially when repairing in a cave, the environment is complex and repair is more difficult.

[0004] The invention patent application with the application publication date of October 26, 2021 and the application publication number of CN113550755A discloses a wear-resistant belt and a shield machine main drive sealed runway, wherein the wear-resistant belt is arranged on the surface of the sealed runway along the circumference of the sealed runway, and the wear-resistant belt includes multiple fiber layers, which are stacked between each fiber layer, and the fiber layers are pressed and formed by a compression molding process. Although this technical solution solves the technical problem of poor wear resistance of the sealed runway, new materials are designed at the wear position and connected to the runway matrix by bolts. This technology is not only costly, but also there is a gap when the new material is bolted to the runway matrix, resulting in poor sealing effect. In addition, since the new material is an integral link and has a large size, it cannot be transported to the main drive position, resulting in the inability to repair the sealed runway in the hole after wear. At the same time, affected by the connection method, the wear belt cannot be adjusted to be misaligned, and the wear belt has an uneven surface due to the threaded hole, which has the risk of aggravating the wear of the seal, which will reduce the life of the seal.

[0005] In summary, the existing technology cannot effectively increase the working time of the sealed runway, and fails to reduce the difficulty of repairing the sealed runway hole after wear. Therefore, it is necessary to propose a new sealed runway, a main drive sealing system and a tunnel boring machine with the main drive sealing system.

[0006] It should be particularly noted that the above technical information is only intended to deepen the understanding of the overall background technology of the present utility model, and should not be regarded as admitting or implying in any form that the above technical information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0007] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a sealed runway, a main drive sealing system and a tunnel boring machine. One technical problem to be solved is that the sealed runway is difficult to repair after being worn, and another technical problem to be solved is that the effective working time of the sealed runway is short.

[0008] The technical solution of this application is:

[0009] A sealed runway comprises a runway base, a groove is arranged at the revolving surface of the runway base, a grinding ring is arranged in the groove, and the grinding ring comprises a plurality of grinding links connected end to end. The technical solution sets the grinding ring in the sealed runway as a segmented structure. When the grinding ring is completely scrapped, the old grinding ring can be cut off with an electric grinder or a cutting machine, and a new grinding ring can be welded on. The difficulty of repair is greatly reduced, which has a positive effect on improving the efficiency of tunnel construction.

[0010] As a preferred technical solution for the sealed runway, the surface of the grinding ring is provided with a wear-resistant layer. This technical solution adds a wear-resistant layer on the basis of the above technical solution. The wear-resistant layer can be a coated wear-resistant material or a composite wear-resistant structure, which can increase the wear resistance of the grinding ring and thus extend the service life of the sealed runway.

[0011] As a preferred technical solution for the sealed runway, a sealing ring groove that fits the grinding ring is provided on the bottom surface or side wall surface of the groove, and a sealing ring is provided in the sealing ring groove. This technical solution adds a sealing ring on the basis of the above technical solution, and a sealing ring groove is designed in the groove. The sealing ring is installed between the grinding ring and the runway base, which can avoid the gap between the grinding ring and the runway base being too large to affect the sealing effect.

[0012] As a preferred technical solution for the sealing runway, when there are several sealing ring grooves, a sealing ring is arranged in each sealing ring groove, and each sealing ring groove is arranged at intervals on the groove bottom surface of the groove, or is arranged on the two side walls of the groove, or is arranged on the groove bottom surface and the side wall surface of the groove. This technical solution provides different arrangements of the sealing ring on the basis of the above technical solution. Although the sealing ring can be arranged at the joint between the grinding ring and the runway substrate, there are multiple options for the specific installation position of the sealing ring. It is preferably installed on the groove bottom surface of the groove, because it is convenient to open the sealing ring groove and obtain a better sealing effect. The sealing ring can withstand radial positive pressure and is also easy to install and disassemble.

[0013] As an optimal technical solution for the sealed runway, adjacent grinding segments are welded together, the grinding ring is designed in sections, and each section of the grinding segment is connected together by welding, which can not only ensure the reliability of the connection, but also enable a new grinding segment to be replaced conveniently and reliably after the grinding segment is removed.

[0014] As a preferred technical solution for the sealed runway, welding grooves are provided at the welding locations between adjacent grinding links.

[0015] As a preferred technical solution for the sealed runway, a heat-insulating groove is provided at the inner wall of the grinding ring opposite to the welding groove, and the welding part of the grinding ring is spaced opposite to the groove through the heat-insulating groove. During welding, the heat-insulating groove can ensure that the welding heat is not transferred to the runway matrix, avoiding welding deformation. Only the interface of the grinding needs to be welded, the welding amount is small, the heat output is small, the welding deformation is controllable, the reliability is higher, the repair difficulty is greatly reduced, and it has a positive effect on improving the efficiency of tunnel construction.

[0016] As a preferred technical solution of the sealed runway, a plurality of grooves are arranged at intervals, and the grinding ring is arranged in each groove.

[0017] A main drive sealing system comprises a coaxially nested pressure ring and a drive disc, the drive disc is provided with a sealing track as described in any of the above technical solutions, and the pressure ring is provided with a sealing member that cooperates with the grinding ring seal.

[0018] As a preferred technical solution of the main drive sealing system, the sealing track is connected to the drive disc through an axial adjustment component.

[0019] As a preferred technical solution of the main drive sealing system, a shoulder is provided on the drive disc, a flange axially corresponding to the shoulder is provided on the runway base, and the axial adjustment assembly includes a gasket provided between the shoulder and the flange.

[0020] As a preferred technical solution of the main drive sealing system, the gasket is connected to the runway base and the drive disc at the same time through bolt one, or the gasket is connected to the drive disc through bolt two, or the gasket is connected to the runway base through bolt three.

[0021] As a preferred technical solution of the main drive sealing system, the gasket is a segmented structure.

[0022] A roadheader comprises a main drive for driving an excavation unit to rotate, wherein the active drive adopts the main drive sealing system described in any one of the above technical solutions.

[0023] Compared with the existing main drive sealed runway of a tunnel boring machine, the utility model proposes a sealed runway, a main drive sealing system and a tunnel boring machine. The application of this structure solves the problems of the short effective working time of the sealed runway in the prior art and the difficulty in repairing the sealed runway after wear in the hole, while ensuring the normal use of the main drive sealing system. It also plays a positive role in improving the efficiency of tunnel construction. In addition, the sealed runway provided by the utility model can be used not only for the main drive sealing system, but also for the sealing of other rotary pairs; the main drive sealing system provided by the utility model can be used not only for tunnel boring machines, but also for other equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A partial cross-sectional view of the main drive sealing system;

[0026] Figure 2 A partial cross-sectional view of the main drive sealing system after adding an axial adjustment component;

[0027] Figure 3 A partial cross-sectional view of the main drive sealing system after adding another axial adjustment component;

[0028] Figure 4 It is a schematic diagram of the structure of the grinding ring in the sealed runway;

[0029] Figure 5 for Figure 4 Enlarged view of the joint of the middle grinding ring.

[0030] Description of Figure Numbers:

[0031] Runway base 1;

[0032] Grinding ring 2, welding groove 2-1, heat insulation groove 2-2;

[0033] Sealing ring 3;

[0034] Lip seal 4;

[0035] Spacer ring 5;

[0036] Pressure ring 6;

[0037] Bolt 17;

[0038] Drive disc 8;

[0039] Gasket 9;

[0040] Bolt 210. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the core concept of the utility model and the following embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0043] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "several" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial" and the like indicate positions or positional relationships only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0044] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0045] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0046] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0047] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0048] A sealed runway, such as Figure 3 As shown, it includes a runway base 1, a groove is arranged at the revolving surface of the runway base 1, a grinding ring 2 is arranged in the groove, and the grinding ring 2 includes a plurality of grinding links connected end to end. In this embodiment, the grinding ring 2 in the sealed runway is set as a segmented structure. When the grinding ring 2 is completely scrapped, the old grinding ring 2 can be cut off by an electric grinder or a cutting machine, and a new grinding ring 2 can be welded. The difficulty of repair is greatly reduced, which has a positive effect on improving the efficiency of tunnel construction.

[0049] Based on the above sealed runway embodiment, as a preferred implementation, a wear-resistant layer is provided on the surface of the wear ring 2. This technical solution adds a wear-resistant layer on the basis of the above technical solution. The wear-resistant layer can be a coated wear-resistant material or a composite wear-resistant structure, which can increase the wear resistance of the wear ring 2 and thus extend the service life of the sealed runway.

[0050] Based on the above sealed track embodiment, as a preferred implementation, a sealing ring groove that fits the grinding ring 2 is provided on the bottom surface or side wall surface of the groove, and a sealing ring 3 is provided in the sealing ring groove. This technical solution is based on the above technical solution, and a sealing ring groove is designed in the groove. The sealing ring 3 is installed between the grinding ring 2 and the track substrate 1, which can avoid the gap between the grinding ring 2 and the track substrate 1 being too large to affect the sealing effect.

[0051] Based on the above-mentioned sealing runway embodiment, as a preferred implementation mode, when there are several sealing ring grooves, a sealing ring 3 is arranged in each sealing ring groove, and each sealing ring groove is arranged at intervals on the groove bottom surface of the groove, or is arranged on the two side walls of the groove, or is arranged on the groove bottom surface and the side wall surface of the groove. This technical solution provides different arrangements of the sealing ring on the basis of the above-mentioned technical solution. Although the sealing ring 3 can be arranged at the joint between the grinding ring 2 and the runway substrate 1, there are multiple options for the specific installation position of the sealing ring 3. It is preferably installed on the groove bottom surface of the groove, because it is convenient to open the sealing ring groove and obtain a better sealing effect. The sealing ring 3 can withstand radial positive pressure and is also easy to install and disassemble.

[0052] On the basis of the above-mentioned sealed runway embodiment, as a preferred implementation mode, adjacent grinding segments are welded together, the grinding ring 2 is designed in sections, and each section of the grinding segment is connected together by welding, which can not only ensure the reliability of the connection, but also enable a new grinding segment to be replaced conveniently and reliably after the grinding segment is removed.

[0053] Based on the above sealed runway embodiment, as a preferred implementation, Figure 4 As shown, welding grooves 2-1 are provided at the welding places between adjacent grinding links.

[0054] Based on the above sealed runway embodiment, as a preferred implementation, Figure 5 As shown, the inner wall of the grinding ring 2 opposite to the welding groove 2-1 is provided with a heat insulation groove 2-2, and the welding part of the grinding ring 2 is spaced opposite to the groove through the heat insulation groove 2-2. During welding, the heat insulation groove 2-2 can ensure that the welding heat is not transferred to the runway substrate 1, avoiding welding deformation. Only the interface of the grinding ring 2 needs to be welded, the welding amount is small, the heat output is small, the welding deformation is controllable, the reliability is higher, and the repair difficulty is greatly reduced, which has a positive effect on improving the efficiency of tunnel construction.

[0055] Based on the above sealed runway embodiment, as a preferred implementation, a plurality of grooves are arranged at intervals, and the grinding ring 2 is arranged in each groove.

[0056] A main drive sealing system, such as Figure 1 and Figure 2 As shown, it includes a coaxially nested pressure ring 6 and a driving plate 8, the driving plate 8 is provided with a sealing track as described in any of the above technical solutions, and the pressure ring 6 is provided with a sealing member that seals with the grinding ring 2.

[0057] Based on the above main drive sealing system embodiment, as a preferred implementation, the sealing track is connected to the drive disc 8 through an axial adjustment assembly.

[0058] Based on the above main drive sealing system embodiment, as a preferred implementation mode, a shoulder is provided on the drive disc 8, a flange axially corresponding to the shoulder is provided on the runway base 1, and the axial adjustment assembly includes a gasket 9 arranged between the shoulder and the flange.

[0059] Based on the above main drive sealing system embodiment, as a preferred implementation mode, the gasket 9 is connected to the runway base 1 and the drive disc 8 at the same time through bolt 1 7, or the gasket 9 is connected to the drive disc 8 through bolt 2 10, or the gasket 9 is connected to the runway base 1 through bolt 3.

[0060] Based on the above main drive sealing system embodiment, as a preferred implementation, the gasket 9 is a segmented structure.

[0061] As a preferred implementation of the main drive sealing system, it includes a sealing track substrate, which is bolted to the drive disc and forms a sealed environment with other sealing components (including seals, sealing spacers, and sealing pressure rings). A groove is circumferentially provided on the track substrate for installing a grinding ring, and a sealing ring groove is designed in the groove for installing a sealing ring; the grinding ring is installed in the groove of the track substrate and contacts with the lip seal; a gasket is bolted to the drive disc, and the drive disc is designed with corresponding threaded holes. At the same time, corresponding holes are provided on the gasket to facilitate the passage of bolts for fixing the track; a bolt jacket connects the drive disc and the gasket.

[0062] As mentioned above, a groove is opened on the sealed runway base and a grinding ring is installed, and a sealing ring groove is designed in the groove. A sealing ring is installed between the grinding ring and the runway base to avoid the gap between the two being too large to affect the sealing effect. The grinding ring is designed in sections, and each section is connected together by welding. There are welding chamfers at both ends of each section of the grinding ring. It is necessary to ensure that the weld depth is less than 2 / 3 of the grinding ring thickness. In addition, grooves larger than 2mm are cut at the bottom of both ends of the grinding ring to ensure that the welding heat is not transferred to the runway base during welding to avoid welding deformation. This design only requires welding at the grinding ring interface, with a small amount of welding, less heat output, controllable welding deformation, and higher reliability.

[0063] In addition, the grinding position of the runway and the seal can be temporarily adjusted by adding a gasket between the runway and the drive disc. This method can make the grinding position of the seal adjustable, effectively increasing the service life of the sealed runway. It should be noted that in order to facilitate bringing it into the tunnel, the gasket is designed in sections, and the thickness can be divided into specifications such as 10mm, 5mm, and 1mm. It is assembled and installed on site according to the wear position and size, which fully reflects the practicality and reliability of the present invention. When the grinding ring is completely scrapped, the old grinding ring can be cut off at the section, and after replacing the sealing ring, a new grinding ring can be welded. Compared with the traditional runway repair method in the tunnel (grinding after welding the wear position in the circumferential direction), the less welding amount and thermal deformation of the present invention greatly improve the repair efficiency of the sealed runway after wear, especially for the complex environment in the tunnel. The reduction in the difficulty of welding repair has a positive effect on improving the efficiency of tunnel construction.

[0064] Therefore, according to this embodiment, the seal grinding position can be flexibly adjusted by the gasket, which effectively increases the working time of the sealed runway. In addition, it is more convenient to repair the runway after it is worn. Due to the small amount of welding, the risk of runway deformation is low, which improves the reliability of the repair of the sealed runway hole and has a positive effect on improving the efficiency of tunnel construction.

[0065] Specific as Figures 1 to 5 As shown, it includes a runway base 1, a grinding ring 2, a sealing ring 3, a lip seal 4, a spacer ring 5, a pressure ring 6, a bolt 1, and a drive disc 8. Among them, the sealing runway base 1 is bolted to the drive disc 8, and the runway base 1 is provided with a groove in the circumference for installing the grinding ring 2. The groove is designed with a sealing ring groove for installing the sealing ring 3; the grinding ring 2 is installed in the groove of the runway base 1; the gasket 9 is bolted to the drive disc 8, and in order to facilitate the passing of the bolt 1 7 for fixing the runway, the gasket 9 is provided with a corresponding hole; the bolt 2 connects the drive disc 8 and the gasket 9.

[0066] A groove is provided on the sealed runway substrate and a grinding ring is installed. A sealing ring groove is designed in the groove. A sealing ring is installed between the grinding ring and the runway substrate to avoid a large gap between the two that affects the sealing effect. The grinding ring is designed in sections, and each section is connected together by welding. If the runway is severely worn during construction, the grinding position of the runway and the seal can be temporarily adjusted by adding a gasket 9 between the runway and the drive disc. This method can make the grinding position of the seal adjustable, effectively increasing the service life of the sealed runway.

[0067] It should be noted that in order to facilitate the insertion into the hole, the gasket is designed in sections, and the thickness can be divided into specifications such as 10mm, 5mm, and 1mm. It is assembled and installed on site according to the wear position and size, which fully reflects the practicality and reliability of the present invention. When the grinding ring 2 is completely scrapped, the old grinding ring 2 can be cut off by an electric grinder or a cutting machine, and the old sealing ring 3 can be removed at the same time. After replacing the sealing ring 3, the new grinding ring 2 can be welded. When welding, pay attention to the alignment of each section, and the welding depth is strictly controlled within the welding groove 2-1 to ensure that the weld depth is less than 2 / 3 of the grinding ring thickness.

[0068] In addition, the bottom of both ends of the grinding ring is cut into insulation grooves 2-2 with a diameter greater than 2 mm to ensure that the welding heat is not transferred to the runway matrix during welding, thus avoiding welding deformation. This design only requires welding at the interface of the grinding ring, with a small amount of welding, less heat output, controllable welding deformation, higher reliability, and greatly reduced repair difficulty, which has a positive effect on improving tunnel construction efficiency.

[0069] A roadheader comprises a main drive for driving an excavation unit to rotate, wherein the active drive adopts the main drive sealing system described in any one of the above technical solutions.

[0070] The parts not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0071] The above content shows and describes the basic principle, main features and beneficial effects of the utility model. The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sealed runway, comprising a runway substrate (1), characterized in that: A groove is provided on the revolving surface of the runway base (1), a grinding ring (2) is provided in the groove, and the grinding ring (2) comprises a plurality of grinding segments connected end to end.

2. The sealed runway according to claim 1, characterized in that: The surface of the grinding ring (2) is provided with a wear-resistant layer.

3. The sealed runway according to claim 1 or 2, characterized in that: A sealing ring groove that fits the grinding ring (2) is provided on the groove bottom surface or the side wall surface of the groove, and a sealing ring (3) is provided in the sealing ring groove.

4. The sealed runway according to claim 3, characterized in that: When there are a plurality of sealing ring grooves, each sealing ring groove is arranged at intervals on the groove bottom surface of the groove, or is respectively arranged on the two side wall surfaces of the groove, or is respectively arranged on the groove bottom surface and the side wall surface of the groove.

5. The sealed runway according to any one of claims 1, 2 and 4, characterized in that: Adjacent grinding links are connected by welding.

6. The sealed runway according to claim 5, characterized in that: Welding grooves (2-1) are provided at welding locations between adjacent grinding links.

7. The sealed runway according to claim 6, characterized in that: A heat insulation groove (2-2) is provided at the inner wall of the grinding ring (2) opposite to the welding groove (2-1), and the welding portion of the grinding ring (2) is spaced opposite to the groove via the heat insulation groove (2-2).

8. The sealed runway according to any one of claims 1-2, 4, 6-7, characterized in that: A plurality of grooves are arranged at intervals, and a grinding ring (2) is arranged in each groove.

9. A main drive sealing system, comprising a pressure ring (6) and a drive disc (8) coaxially nested, characterized in that: The driving disc (8) is provided with a sealing track according to any one of claims 1 to 8, and the pressure ring (6) is provided with a sealing member that seals with the grinding ring (2).

10. The main drive sealing system according to claim 9, characterized in that: The sealing raceway is connected to the driving disc (8) via an axial adjustment assembly.

11. The main drive sealing system according to claim 10, characterized in that: The driving disc (8) is provided with a shoulder, the runway base (1) is provided with a flange axially corresponding to the shoulder, and the axial adjustment component comprises a gasket (9) arranged between the shoulder and the flange.

12. The main drive sealing system according to claim 11, characterized in that: The gasket (9) is connected to the runway base (1) and the drive disc (8) simultaneously via bolt one (7), or the gasket (9) is connected to the drive disc (8) via bolt two (10), or the gasket (9) is connected to the runway base (1) via bolt three.

13. The main drive sealing system according to claim 11 or 12, characterized in that: The gasket (9) is a segmented structure.

14. A roadheader, comprising a main drive for driving an excavation unit to rotate, characterized in that: The main drive adopts the main drive sealing system described in any one of claims 9-13.

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