A center rotating body structure for a shield tunneling machine

Abstract

The utility model belongs to the technical field of shield machine, concretely relates to a center rotary body structure for shield machine. Including fixed ring, rotary ring, drive connection subassembly, drive rotary body and sealing assembly, wherein fixed ring is fixed on the slag chute, the rotary ring is sleeved in the outside of fixed ring, and can rotate relative to fixed ring, and fixed ring and rotary ring are equipped with fixed interface and rotary interface respectively, the inner surface of rotary ring is equipped with annular groove with fixed interface and rotary interface intercommunication, fixed interface is connected with the fixed part pipeline connection of shield machine, and rotary interface is connected with the pipeline connection of cutterhead, the sealing between rotary ring and fixed ring is carried out through sealing assembly, drive rotary body is connected with main drive, and drive rotary body is connected with rotary ring through drive connection subassembly. The utility model installs the rotary joint on the slag chute, makes when replacing the tool not to disassemble the pipeline, not only shortens the time of changing the tool, makes the change tool operation more convenient and fast, but also saves manpower, material resources cost.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel boring machine technology, specifically relating to a central rotating body structure for tunnel boring machines. Background Technology

[0002] The central rotating body of a tunnel boring machine (TBM) is a core component of an earth pressure balance TBM. Its core function is to ensure the stable transport of fluids (such as foam media) between the cutterhead and the machine body while the TBM rotates and turns to adapt to tunnel bends, thereby ensuring the accuracy and quality of tunnel excavation. In the traditional structural design of the central rotating body, the central axis of rotation is connected to the cutterhead and rotates synchronously with it, while the outer shell is connected to the fixed part of the TBM. In the actual application scenario of hard rock TBMs, the traditional central rotating body is directly installed on the back side of the cutterhead and connected and fixed through the front plate of the chute. This installation layout causes the main structure of the central rotating body and the connecting pipelines to directly occupy the space around the cutterhead in the central area. When it is necessary to stop the machine to replace the cutterhead in the central area during tunneling, the interference between the cutterhead and the connecting pipelines and the main structure of the central rotating body prevents the staff from directly accessing the cutterhead to be replaced. All connecting pipelines between the central rotating body and the fixed part and the cutterhead must be completely removed before sufficient operating space can be made for the cutter replacement operation. This technical problem directly triggered multiple chain reactions: on the one hand, the process of dismantling and reinstalling pipelines was cumbersome, requiring significant manpower and resources, and greatly extending the cutterhead replacement time, resulting in excessively long interruptions in tunnel boring machine (TBM) excavation. On the other hand, frequent pipeline dismantling easily caused wear and tear on pipeline interfaces and damage to seals, increasing the risk of fluid leakage, and requiring additional costs for pipeline maintenance and seal replacement. Simultaneously, prolonged downtime for cutterhead replacement also affected the overall construction progress, reduced tunnel excavation efficiency, and indirectly increased project construction costs. These problems were particularly prominent in the high-intensity tunneling operations of hard rock TBMs, severely restricting the continuity and economy of construction. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing shield machine center slewing body and provide a shield machine center slewing body structure that is reasonably designed, safe to use, does not affect normal production, and improves production efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a central rotating body structure for a tunnel boring machine (TBM), including a fixed ring, a rotating ring, a drive connection assembly, a drive rotating body, and a sealing assembly. The fixed ring is fixed to the chute, and the rotating ring is fitted around the outside of the fixed ring and can rotate relative to the fixed ring. The fixed ring and the rotating ring are respectively provided with a fixed interface and a rotating interface. The inner surface of the rotating ring is provided with an annular groove communicating with the fixed interface and the rotating interface. The fixed interface on the fixed ring is connected to the pipeline of the fixed part of the TBM, and the rotating interface of the rotating ring is connected to the pipeline of the cutterhead. The rotating ring and the fixed ring are sealed by the sealing assembly. The drive rotating body is connected to the main drive of the TBM and rotates with the main drive. The drive rotating body is connected to the rotating ring through the drive connection assembly.

[0006] The drive connection assembly includes a shift fork and a main drive connection block, wherein the main drive connection block is disposed on the drive rotating body, one end of the shift fork is connected to the rotating ring, and the other end is connected to the main drive connection block in the form of a fork, forming a complete power transmission link.

[0007] The main drive connecting block is provided with a boss or slot for engaging with the shift fork.

[0008] The drive connection components are in multiple sets and are arranged at equal intervals along the circumferential direction.

[0009] The sealing assembly includes a mechanical seal, an O-ring, and a lip seal. There are two sets of mechanical seals, which are axially spaced and embedded on the outer circumference of the fixed ring. The two sets of mechanical seals are located on both sides of the annular groove of the rotating ring. Both ends of the rotating ring are sealed by an O-ring and a lip seal, with the lip seal located outside the O-ring.

[0010] The advantages and beneficial effects of this utility model are as follows: This utility model adopts an open-type central rotating body and installs the rotary joint on the slag chute, so that the pipeline does not need to be disassembled when changing the cutter. This not only shortens the cutter replacement time and makes the cutter replacement operation more convenient and quick, but also saves manpower and material costs, while ensuring the continuity of construction and improving the overall work efficiency.

[0011] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0012] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of a central rotating body structure for a tunnel boring machine according to the present invention;

[0015] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle;

[0016] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle.

[0017] In the diagram: 1. Cutter head; 2. Slag chute; 3. Fixed ring; 301. Fixed interface; 4. Rotating ring; 401. Annular groove; 402. Rotating interface; 5. Drive connection assembly; 501. Shift fork; 502. Main drive connection block; 6. Drive rotating body; 7. Mechanical seal; 8. O-ring seal; 9. Lip seal; 11. Connecting bolt. Detailed Implementation

[0018] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] See Figures 1 to 3As shown, this utility model provides a central rotating body structure for a tunnel boring machine (TBM), including a fixed ring 3, a rotating ring 4, a drive connection assembly 5, a drive rotating body 6, and a sealing assembly. The fixed ring 3 is fixed to the chute 2 by connecting bolts 11. The rotating ring 4 is fitted on the outside of the fixed ring 3 and can rotate relative to the fixed ring 3. The fixed ring 3 and the rotating ring 4 are respectively provided with a fixed interface 301 and a rotating interface 402 along the radial direction. The inner surface of the rotating ring 4 is provided with an annular groove 401 communicating with the fixed interface 301 and the rotating interface 402. The fixed interface 301 on the fixed ring 3 is connected to the pipeline of the fixed part of the TBM, and the rotating interface 402 of the rotating ring 4 is connected to the pipeline of the cutterhead 1. The rotating ring 4 and the fixed ring 3 are sealed by the sealing assembly. The drive rotating body 6 is connected to the main drive of the TBM and rotates with the main drive. The drive rotating body 6 is connected to the rotating ring 4 through the drive connection assembly 5.

[0021] In embodiments of this utility model, the drive connection components 5 are multiple sets, and are arranged at equal intervals along the circumferential direction. Specifically, see... Figure 3 As shown, the drive connection component 5 includes a shift fork 501 and a main drive connection block 502. The main drive connection block 502 is disposed on the drive rotating body 6. One end of the shift fork 501 is connected to the rotating ring 4, and the other end is connected to the main drive connection block 502 in the form of a fork, forming a complete power transmission link.

[0022] Furthermore, the main drive connecting block 502 is provided with a boss or slot for engaging with the shift fork 501.

[0023] See Figure 2 As shown in the embodiment of this utility model, the sealing assembly includes a mechanical seal 7, an O-ring 8, and a lip seal 9. Two sets of mechanical seals 7 are axially spaced and embedded on the outer circumference of the fixed ring 3. The two sets of mechanical seals 7 are located on both sides of the annular groove 401 of the rotating ring 4, and the mechanical seals 7 directly bear the fluid pressure and rotational friction. Both ends of the rotating ring 4 are sealed by the O-ring 8 and the lip seal 9, with the lip seal 9 located outside the O-ring 8. The O-ring 8 is used for auxiliary sealing or to compensate for radial deviation; the lip seal 9 is used to prevent slag, dust, and moisture from entering the sealing system.

[0024] This utility model provides a central rotating body structure for a tunnel boring machine, the working principle of which is as follows:

[0025] During the tunnel boring machine's excavation process, foam medium (used to improve the excavated soil and reduce cutting resistance) needs to be conveyed to the front of the cutterhead 1. The conveying process is achieved through "dynamic-static interface connection":

[0026] The foam medium first flows into the fixed interface 301 of the fixed ring 3 through the pipeline on the fixed side of the tunnel boring machine. Since the contact surface between the rotating ring 4 and the fixed ring 3 is provided with an annular groove 401 corresponding to the fixed interface 301, even if the rotating ring 4 rotates at high speed with the cutterhead 1, its rotating interface 402 is always connected to the fixed interface 301 of the fixed ring 3 through the annular groove 401. The foam medium flows into the rotating interface 402 of the rotating ring 4 through the annular groove 401 and is finally delivered to the pipeline of the cutterhead 1 to meet the fluid requirements of the tunneling process.

[0027] Throughout the process, the sealing assembly always plays a "dynamic sealing" role, which allows the rotating ring 4 to rotate freely relative to the fixed ring 3, while preventing leakage of foam media, thus ensuring the stability and sealing of fluid transportation.

[0028] The central rotating body of this utility model adopts an open structure. The rotary joint is installed on the chute 2 and engages with the main drive. During the tunneling process, the movement space between the main drive and the cutterhead 1 is increased. When changing the cutter, it is not necessary to disassemble the pipeline, which improves work efficiency, saves costs, manpower and material resources, and shortens the cutter replacement time.

[0029] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A central rotating body structure for a tunnel boring machine, characterized in that, The device includes a fixed ring (3), a rotating ring (4), a drive connection assembly (5), a drive rotating body (6), and a sealing assembly. The fixed ring (3) is fixed on the chute (2), and the rotating ring (4) is fitted on the outside of the fixed ring (3) and can rotate relative to the fixed ring (3). The fixed ring (3) and the rotating ring (4) are respectively provided with a fixed interface (301) and a rotating interface (402). The inner surface of the rotating ring (4) is provided with an annular groove (401) that communicates with the fixed interface (301) and the rotating interface (402). The fixed interface (301) on the fixed ring (3) is connected to the pipeline of the fixed part of the tunnel boring machine, and the rotating interface (402) of the rotating ring (4) is connected to the pipeline of the cutterhead (1). The rotating ring (4) and the fixed ring (3) are sealed by the sealing assembly. The drive rotating body (6) is connected to the main drive of the tunnel boring machine and rotates with the main drive. The drive rotating body (6) is connected to the rotating ring (4) through the drive connection assembly (5).

2. The central rotating body structure for a tunnel boring machine according to claim 1, characterized in that, The drive connection component (5) includes a shift fork (501) and a main drive connection block (502), wherein the main drive connection block (502) is disposed on the drive rotating body (6), one end of the shift fork (501) is connected to the rotating ring (4), and the other end is connected to the main drive connection block (502) in the form of a fork, forming a complete power transmission link.

3. The central rotating body structure for a tunnel boring machine according to claim 2, characterized in that, The main drive connecting block (502) is provided with a boss or slot for engaging with the shift fork (501).

4. The central rotating body structure for a tunnel boring machine according to claim 1, characterized in that, The drive connection components (5) are in multiple groups and are arranged at equal intervals along the circumferential direction.

5. The central rotating body structure for a tunnel boring machine according to claim 1, characterized in that, The sealing assembly includes a mechanical seal (7), an O-ring (8), and a lip seal (9). There are two sets of mechanical seals (7), which are axially spaced and embedded on the outer circumference of the fixed ring (3). The two sets of mechanical seals (7) are located on both sides of the annular groove (401) of the rotating ring (4). Both ends of the rotating ring (4) are sealed by the O-ring (8) and the lip seal (9), with the lip seal (9) located outside the O-ring (8).

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