Emergency sealing method for tunnel boring machines

Abstract

This invention discloses an emergency sealing method for a tunnel boring machine (TBM). The TBM sealing system includes a front shield, a main drive, and a main bearing, with the main bearing positioned between the main drive and the front shield. A sealing assembly, located in front of the main bearing, achieves sealed contact between the front shield and the main drive. The assembly further includes: a shield connecting ring, detachably and fixedly installed on the front shield and sealingly connected thereto; a drive connecting ring, detachably and fixedly installed on the main drive and sealingly connected thereto; and a sealing ring, disposed in the cavity between the shield connecting ring and the drive connecting ring to seal the gap between the front shield and the main drive in front of the sealing assembly. The emergency sealing device, consisting of the shield connecting ring, drive connecting ring, and sealing ring, installed in front of the TBM, is simple and convenient to operate. Therefore, it effectively solves the problem of the main drive sealing assembly failing to function properly in a TBM.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machines, and more specifically, to an emergency sealing method for tunnel boring machines. Background Technology

[0002] The main drive is connected to the front shield via high-strength studs, providing cutting torque to the cutterhead. It is equipped with a sealing system that uses automatic continuous grease injection to prevent sand, gravel, and sewage from the excavation chamber from entering the gearbox. Currently, multiple polyurethane or lip seals are generally used, with sealing grease added to the sealing cavity for sealing.

[0003] Its main defects are as follows:

[0004] During tunnel boring machine (TBM) construction, the risk of leakage can lead to the accumulation of water or other debris in the front annular cavity of the seal. Despite regular grease lubrication, dust and water can still seep into the seal lip, accelerating wear and failure, and potentially allowing mud and water to enter. Furthermore, in tunneling under conditions of great depth, high water pressure, long distances, and complex geological conditions, if the main drive seal fails, damaging the main bearing, the TBM will be shut down. Replacing the main drive seal inside the tunnel is extremely difficult. If this situation occurs, the risks of TBM construction increase, the construction period is extended, costs rise, and significant losses are incurred by the construction company.

[0005] In conclusion, how to effectively solve the problem of the main drive sealing component failing to function properly in tunnel boring machines is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an emergency sealing method for tunnel boring machines.

[0007] This invention provides the following technical solution:

[0008] A tunnel boring machine sealing system includes a front shield, a main drive, and a main bearing, wherein the main bearing is disposed between the main drive and the front shield; a sealing assembly is used to achieve sealed contact between the front shield and the main drive on the front side of the main bearing, and the system further includes:

[0009] The shield connecting ring is detachably and fixedly installed on the front shield and sealed together.

[0010] The drive connecting ring is detachably and fixedly installed on the main drive and is sealed to it.

[0011] A sealing ring is disposed in the cavity between the shield connecting ring and the drive connecting ring to seal the gap between the front shield and the main drive on the front side of the sealing assembly.

[0012] In application, when the sealing component used as the primary seal fails or its sealing effectiveness decreases, an emergency sealing device consisting of a shield connecting ring, a drive connecting ring, and a sealing ring can be installed on the front side of the tunnel boring machine (TBM). This allows the TBM to continue tunneling forward without replacing the sealing component. Furthermore, installing the shield connecting ring, drive connecting ring, and sealing ring on the front side of the TBM is relatively simple and convenient. In summary, this TBM sealing system effectively solves the problem of inadequate operation when the main drive sealing component fails in a TBM.

[0013] Preferably, the shield connecting ring and / or the drive connecting ring are provided with an oil injection port for injecting oil into the sealing ring.

[0014] Preferably, it further includes a sealing clamping ring for clamping and fixing the sealing ring.

[0015] Preferably, at least two of the sealing rings are stacked axially and separated from each other by an isolation ring.

[0016] Preferably, the sealing and clamping ring is fixed to the shield connecting ring, and the sealing and clamping ring, the front sealing ring, the isolation ring, the rear sealing ring and the front shield are in close contact in sequence.

[0017] Preferably, the drive connecting ring is provided with at least one radially through oil injection port, and the outlet end of the oil injection port is located in the cavity between two adjacent sealing rings.

[0018] Preferably, it further includes a shield connecting screw and a drive connecting screw. The shield connecting screw passes backward through the sealing clamping ring and the shield connecting ring in sequence and is fixedly connected to the front shield. The drive connecting screw passes backward through the drive connecting ring and is connected to the main drive. An annular gap is formed between the shield connecting ring and the drive connecting ring. In the axial rearward direction, the pressure part of the sealing clamping ring, the front sealing ring, the isolation ring and the rear sealing ring are distributed in sequence in the annular gap. The pressure part of the sealing clamping ring is configured to cooperate with the annular gap.

[0019] Preferably, one side of the sealing ring is fixed relative to one of the shield connecting ring and the drive connecting ring; the other side of the sealing ring forms a forward-inclined contact angle to make sealing contact with the other of the shield connecting ring and the drive connecting ring.

[0020] Preferably, the shield connecting ring is detachably and fixedly installed on the central ring of the front shield, and the drive connecting ring is detachably and fixedly installed on the flange of the main drive; a cutterhead flange is also installed on the front side of the flange of the main drive, and the central ring of the front shield is fixedly connected to the gearbox.

[0021] This invention also provides an emergency sealing method for a tunnel boring machine (TBM). This method includes the following steps: removing a first connecting screw on the front shield where a protective gasket is installed, and removing a second connecting screw on the main drive where a protective gasket is installed, wherein the protective gasket is a gasket located at the front side of the gap between the front shield and the main drive; installing a shield connecting ring on the front side of the front shield, and using a shield connecting screw for detachable fixing through a hole on the front shield that mates with the first connecting screw; installing a drive connecting ring on the front side of the main drive, and using a drive connecting screw for detachable fixing through a hole on the main drive that mates with the second connecting screw; and setting a sealing ring in the cavity between the shield connecting ring and the drive connecting ring to seal the gap between the front shield and the main drive at the front side of the sealing assembly. Since the aforementioned TBM sealing system has the above-mentioned technical effects, the emergency sealing method for a TBM with this sealing system should also have corresponding technical effects. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the shield machine sealing system after the installation of the emergency sealing device, provided in an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the emergency sealing device provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the shield machine sealing system before the installation of the emergency sealing device, as provided in an embodiment of the present invention.

[0026] The following labels are shown in the attached diagram:

[0027] 1-Main bearing, 2-Gearbox, 3-Front shield, 4-First connecting screw, 5-Protective gasket, 6-Second connecting screw, 7-Sealing assembly, 8-Main drive, 9-Cutter disc flange, 10-Shield connecting ring, 11-Isolation ring, 12-Sealing ring, 13-Shield connecting screw, 14-Sealing clamping ring, 15-Drive connecting screw, 16-Drive connecting ring, 17-Oil inlet. Detailed Implementation

[0028] This invention discloses a shield machine sealing system that can effectively solve the problem of the shield machine failing to work properly when the main drive sealing component fails.

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1-3 , Figure 1 This is a schematic diagram of the shield machine sealing system after the installation of the emergency sealing device, provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the emergency sealing device provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the shield machine sealing system before the installation of the emergency sealing device, as provided in an embodiment of the present invention.

[0031] In some embodiments, an emergency sealing device for the main drive of a tunnel boring machine is provided, which can be applied to tunnel boring machines that are excavating over long distances. This device prevents sand, gravel, sewage, and other contaminants from the excavation chamber from entering the gearbox and causing damage to the main bearing due to wear and failure of the main drive seal, thus providing emergency protection for the main drive.

[0032] In some embodiments, as shown in the appendix Figure 1 As shown, the tunnel boring machine's sealing system includes not only the sealing assembly 7 but also an emergency sealing device. The emergency sealing device mainly comprises a shield connecting ring 10, a drive connecting ring 16, and a sealing ring 12. In use, if the sealing assembly 7 fails and becomes unusable, the emergency sealing device can be reinstalled, allowing the entire tunnel boring machine to continue moving forward to complete the current excavation.

[0033] In some embodiments, such as Figure 1 , 2 As shown, a shield machine sealing system is provided, which mainly includes a front shield 3, a main drive 8, a main bearing 1, a sealing assembly 7, a shield connecting ring 10, a drive connecting ring 16, and a sealing ring 12.

[0034] The main bearing 1 is disposed between the main drive 8 and the front shield 3 to guide the rotation of the main drive 8 relative to the front shield 3. A gap is formed between the main drive 8 and the front shield 3, and this gap is dynamically sealed by a sealing assembly 7. The sealing assembly 7 is disposed in front of the main bearing 1 to prevent impurities such as mortar from the front of the tunnel boring machine from entering the main bearing 1. During use, lubricating oil is generally continuously supplied to the sealing assembly 7 to ensure smooth movement of the sealing components in the sealing assembly 7, and the lubricating oil can be discharged forward from the gap between the main drive 8 and the front shield 3. It should be noted that the arrangement of the sealing assembly 7 is not limited to that shown in the attached figure. Figure 1As shown, the sealing assembly may include an axial sealing assembly and / or a radial sealing assembly. The sealing assembly 7 is located in front of the main bearing 1, but not necessarily in a spatial sense. It is sufficient that impurities entering the gap between the main drive 8 and the front shield 3 from the front of the tunnel boring machine cannot pass through the sealing assembly 7 and enter the main bearing 1. The gap between the main drive 8 and the front shield 3 can extend back and forth or be arranged in a reciprocating manner. The main drive 8 and the front shield 3 are arranged radially inward and outward, with the main drive 8 forming either the outer wall or the inner wall of the gap.

[0035] The shield connecting ring 10, the drive connecting ring 16 and the sealing ring 12 constitute the above-mentioned emergency sealing device. Of course, the above-mentioned emergency sealing device may be further provided with other structures.

[0036] The shield connecting ring 10 is detachably and fixedly installed on the front shield 3; the drive connecting ring 16 is detachably and fixedly installed on the main drive 8; and the sealing ring 12 is disposed in the cavity between the shield connecting ring 10 and the drive connecting ring 16 to seal the gap between the front shield 3 and the main drive 8 on the front side of the sealing assembly 7. That is, the drive connecting ring 16 and the shield connecting ring 10 form a gap that the sealing ring 12 can seal, and the sealing ring 12 is disposed in the cavity between the shield connecting ring 10 and the drive connecting ring 16. It should be noted that the sealing ring 12 seals the gap between the front shield 3 and the main drive 8 on the front side of the sealing assembly 7, so that the mortar on the front side of the tunnel boring machine cannot cross the sealing ring 12 to reach the sealing assembly 7, thereby replacing the sealing assembly 7 in sealing the gap between the front shield 3 and the main drive 8. The aforementioned detachable and fixed installation methods include screw connections, bolt connections, and snap-fit ​​connections.

[0037] In some embodiments, the shield connecting ring 10 is sealed to the front shield 3, and the drive connecting ring 16 is sealed to the main drive 8. Specifically, the shield connecting ring 10 may be tightly fitted against the front side of the front shield 3, and the drive connecting ring 16 may be tightly fitted against the front side of the main drive 8. This ensures that mortar can only reach the gap between the front shield 3 and the main drive 8 by passing through the gap between the shield connecting ring 10 and the drive connecting ring 16. The sealing ring 12 is generally fixed relative to one of the shield connecting ring 10 and the drive connecting ring 16, and makes sealing contact with the other to achieve a dynamic seal.

[0038] In some embodiments, when the sealing component 7, which serves as the primary seal, fails or its sealing effectiveness decreases during application, an emergency sealing device consisting of a shield connecting ring 10, a drive connecting ring 16, and a sealing ring 12 can be installed on the front side of the tunnel boring machine (TBM). This allows the TBM to continue tunneling forward without replacing the sealing component 7. Furthermore, installing the shield connecting ring 10, drive connecting ring 16, and sealing ring 12 on the front side of the TBM is relatively simple and convenient. In summary, this TBM sealing system effectively solves the problem of the main drive sealing component failing to function properly in a TBM.

[0039] In some embodiments, an oil inlet 17 may be provided to directly supply lubricating oil to the sealing ring 12, thereby ensuring the dynamic sealing effect. Specifically, the shield connecting ring 10 and / or the drive connecting ring 16 may be provided with an oil inlet 17 for injecting oil into the sealing ring 12. The oil inlet 17 may be located on the shield connecting ring 10 or the drive connecting ring 16, depending on the needs, with the aim of directly guiding the lubricating oil into the sealing ring 12. The specific inlet location is on the dynamic sealing side of the sealing ring 12, and preferably on the rear side of the sealing ring 12, so that the lubricating oil can pass through the sealing ring 12 from back to front and then be discharged from the front side of the tunnel boring machine.

[0040] In some embodiments, the shield machine sealing system may further include a sealing clamping ring 14 for clamping and fixing the sealing ring 12. For example, when the sealing ring 12 is fixed relative to the shield connecting ring 10, the sealing clamping ring 14 is also fixed relative to the shield connecting ring 10. If the sealing ring 12 is fixed relative to the drive connecting ring 16, the sealing clamping ring 14 is also fixed relative to the drive connecting ring 16. This allows for better fixing of the sealing ring 12. It should be noted that when multiple sealing rings 12 are provided, some sealing rings 12 may be fixed relative to the shield connecting ring 10, while other sealing rings 10 may be fixedly connected to the drive connecting ring 16, or all sealing rings 12 may be fixed relative to either the shield connecting ring 10 or the drive connecting ring 16.

[0041] In some embodiments, to ensure a sealing effect, at least two of the sealing rings 12 can be stacked axially to provide a double-layer seal, thereby ensuring the sealing effect of the emergency sealing device.

[0042] In some embodiments, to better secure each sealing ring 12, adjacent sealing rings 12 can be separated by an isolation ring 11. The structure of the sealing ring 12 can refer to the sealing ring structure used in the sealing assembly 7. Generally, rubber rings, nylon rings, etc. are used. The hardness of the sealing ring 12 is significantly less than that of the isolation ring 11, sealing compression ring 14, etc. The isolation ring 11, sealing compression ring 14, shield connecting ring 10, and drive connecting ring 16 can be selected as plastic rings or metal rings as needed. Whether the materials of them are the same is not specifically required; they can be the same or different.

[0043] In some embodiments, for ease of fixation, the sealing compression ring 14 can be fixed to the shield connecting ring 10, and the sealing compression ring 14 is used to push the front sealing ring 12, the isolation ring 11, the rear sealing ring 12 and the front shield 3 to abut tightly in sequence, so that the sealing compression ring 14, the front sealing ring 12, the isolation ring 11, the rear sealing ring 12 and the front shield 3 abut tightly in sequence, so as to achieve sealing contact and fixed connection between the sealing ring 12 and the front shield 3.

[0044] And / or the sealing clamping ring 14 is fixed to the drive connecting ring 16, and the sealing clamping ring 14 is used to push the front sealing ring 12, the isolation ring 11, the rear sealing ring 12 and the main drive 8 to abut tightly in sequence, so that the sealing clamping ring 14, the front sealing ring 12, the isolation ring 11, the rear sealing ring 12 and the main drive 8 abut tightly in sequence, so as to achieve sealing contact and fixed connection between the sealing ring 12 and the main drive 8.

[0045] In some embodiments, for convenience, at least one radially through-hole oil inlet 17 can be provided on the drive connecting ring 16 and / or the shield connecting ring 10. The outlet end of the oil inlet 17 can be located in the cavity between two adjacent sealing rings 12. Of course, the outlet end of the oil inlet 17 can be located on the rear side of the rear sealing ring 12 or on the front side of the front sealing ring 12. When only one sealing ring 12 is provided, it is preferable that the outlet end of the oil inlet 17 is located on the rear side of the sealing ring 12, so that the oil inlet of the oil inlet 17 can flow forward from the sealing ring 12 for easy discharge.

[0046] In some embodiments, such as where the main drive 8 is located radially inside the front shield 3, specifically, at the emergency sealing device, the main drive 8 is located radially inside the front shield 3. In this case, the drive connecting ring 16 is located radially inside the shield connecting ring 10, and the sealing compression ring 14, the front sealing ring 12, the isolation ring 11, the rear sealing ring 12, and the front shield 3 are sequentially and tightly abutted against each other. In this case, the drive connecting ring 16 may have a radially through-type oil injection port 17, preferably a plurality of circumferentially evenly distributed oil injection ports 17.

[0047] In some embodiments, for convenient detachable and fixed installation, the tunnel boring machine sealing system may further include a shield connecting screw 13 and a drive connecting screw 15. The shield connecting screw 13 passes rearward through the sealing clamping ring 14 and the shield connecting ring 10 in sequence and is then fixedly connected to the front shield 3. If it is a bolt, it will pass through a through hole on the front shield 3; if it is a screw, it can be threadedly connected to a threaded hole on the front shield 3. The drive connecting screw 15 passes rearward through the drive connecting ring 16 and is then connected to the main drive 8. If it is a bolt, it will pass through a through hole on the main drive 8; if it is a screw, it can be threadedly connected to a threaded hole on the main drive 8.

[0048] In some embodiments, an annular gap is formed between the shield connecting ring 10 and the drive connecting ring 16 in the axial rearward direction. The annular gap contains, in sequence, the pressing part of the sealing clamping ring 14, the front sealing ring 12, the isolation ring 11, and the rear sealing ring 12. The pressing part of the sealing clamping ring 14 is configured to cooperate with the annular gap. The smaller the cooperation gap, the better. If it is too large, it is easy for sand and gravel to enter. If it is too small, it is not conducive to the discharge of lubricating oil and it is easy to get clogged.

[0049] In some embodiments, the structure of the sealing ring 12 can refer to the sealing ring of a dynamic seal in the prior art, or it can be a ring-shaped sealing ring with a rectangular, circular, or elliptical cross-section. Alternatively, it can be the same as or similar in shape to the sealing structure in the sealing assembly 7. To facilitate the discharge of lubricating oil and prevent sand and gravel from passing backward over the sealing ring 12, one side of the sealing ring 12 can be fixed relative to one of the shield connecting ring 10 and the drive connecting ring 16; the other side of the sealing ring 12 forms a forward-inclined contact angle to make sealing contact with the other of the shield connecting ring 10 and the drive connecting ring 16. It should be noted that in this context, "forward" refers to the tunneling direction of the tunnel boring machine.

[0050] If the outer side of the sealing ring 12 is fixed relative to the shield connecting ring 10, the inner side of the sealing ring 12 forms a forward-inclined contact angle that contacts the drive connecting ring 16. When the lubricating oil is located behind the contact angle, the forward thrust acting on the contact angle is divided into a radially outward thrust, which pushes the contact angle radially outward to widen the gap between the contact angle and the drive connecting ring 16. When the sand is located in front of the contact angle, the backward thrust acting on the contact angle is divided into a radially inward thrust, which pushes the contact angle radially inward to ensure tight contact between the contact angle and the drive connecting ring 16. This increases the thrust and the more effectively the sand can be prevented from moving backward.

[0051] In some embodiments, the shield connecting ring 10 can be detachably and fixedly mounted on the central ring of the front shield 3, and the drive connecting ring 16 can be detachably and fixedly mounted on the flange of the main drive 8. A cutterhead flange 9 can also be mounted on the front side of the flange of the main drive 8, and the central ring of the front shield 3 can be fixedly connected to the gearbox 2, specifically, using bolts or screws.

[0052] Based on the shield machine sealing system provided in the above embodiments, the present invention also provides an emergency sealing method for a shield machine, which includes the following steps:

[0053] Step 100: Remove the first connecting screw 4 on the front shield 3 where the protective gasket 5 is installed, and remove the second connecting screw 6 on the main drive 8 where the protective gasket 5 is installed, wherein the protective gasket 5 is the gasket at the front side of the gap between the front shield 3 and the main drive 8.

[0054] Step 200: Install the shield connecting ring 10 on the front side of the front shield 3, and detachably fix it with the shield connecting screw 13 through the hole on the front shield 3 that mates with the first connecting screw 4; install the drive connecting ring 16 on the front side of the main drive 8, and detachably fix it with the drive connecting screw 15 through the hole on the main drive 8 that mates with the second connecting screw 6; and set a sealing ring 12 in the cavity between the shield connecting ring 10 and the drive connecting ring 16 to seal the gap between the front shield 3 and the main drive 8 on the front side of the sealing assembly 7.

[0055] Specifically, prior to step 100, the structure of the tunnel boring machine sealing system can be as shown in the attached figure. Figure 3As shown, the shield machine sealing system mainly includes a main bearing 1, a gearbox 2, a front shield 3, a first connecting bolt 4, a protective gasket 5, a second connecting bolt 6, a sealing assembly 7, a main drive 8, and a cutterhead flange 9. The main bearing 1 and gearbox 2 are fixed to the front shield 3 by connecting bolts. The outer protective gasket 5 is fixed to one side of the front shield 3 in the tunneling direction by the first connecting bolt 4, and the outer protective gasket 5 is flush with the inner side of the front shield 3. The inner protective gasket 5 is fixed to one side of the main drive 8 in the tunneling direction by the second connecting bolt 6, and the inner protective gasket 5 is flush with the inner side of the main drive 8. The cutterhead flange 9 and the main drive 8 are fixed to the main bearing 1 by bolts. The sealing assembly 7 is fixed to the main drive 8, and the front end face of the main drive 8 is flush with the front end face of the front shield 3. There is a certain gap between the outer and inner protective gaskets 5 to allow grease to drain.

[0056] When tunneling over long distances, the main drive seal will experience varying degrees of wear as the tunnel boring machine (TBM) advances to a certain distance. Preferably, the main drive seal can be used to seal the tunnel under normal conditions before proceeding. When the main drive seal fails due to wear, steps 100 and 200 can be executed. Step 200 can involve installing any of the aforementioned emergency sealing devices to form a TBM sealing system with at least a shield connecting ring 10, a drive connecting ring 16, and a sealing ring 12. As in the various embodiments described above, the emergency sealing device includes at least the shield connecting ring 10, the drive connecting ring 16, and the sealing ring 12, and may optionally include structures such as a sealing compression ring 14 and an isolation ring 11.

[0057] Since this emergency sealing method for tunnel boring machines (TBMs) adopts the TBM sealing system described in the above embodiments, the beneficial effects of this method can be found in the above embodiments. Furthermore, after the first connecting screw 4 and the second connecting screw 6 are removed, the shield connecting screw 13 and the drive connecting screw 15 can be installed respectively to complete the installation of the emergency sealing device without altering the existing structure of the TBM, thereby reducing operating costs. Since both are installed on the front side of the TBM, installation is convenient and simple.

[0058] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other, or they can be combined to form a new embodiment.

[0059] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of emergency sealing of a tunneling machine, characterized in that, The shield machine sealing system comprises a front shield (3), a main drive (8) and a main bearing (1) arranged between the main drive (8) and the front shield (3); a sealing assembly (7) is arranged between the front shield (3) and the main drive (8) on the front side of the main bearing (1); further comprising: a shield connecting ring (10) which is detachably fixedly installed on the front shield (3) and sealedly connected therebetween; a drive connecting ring (16) which is detachably fixedly installed on the main drive (8) and sealedly connected therebetween; a sealing ring (12) arranged in the cavity between the shield connecting ring (10) and the drive connecting ring (16) to seal the gap between the front shield (3) and the main drive (8) on the front side of the sealing assembly (7); a sealing compression ring (14) for compressing and fixing the sealing ring (12); at least two sealing rings (12) are stacked in the axial direction and separated by a separation ring (11) therebetween; the sealing compression ring (14) is fixed to the shield connecting ring (10), and the sealing compression ring (14), the sealing ring (12) on the front side, the separation ring (11), the sealing ring (12) on the rear side and the front shield (3) are sequentially and closely abutted; the shield connecting ring (10) is detachably fixedly installed on the center ring of the front shield (3), and the drive connecting ring (16) is detachably fixedly installed on the flange of the main drive (8); the flange of the main drive (8) is further provided with a cutter flange (9), and the center ring of the front shield (3) is fixedly connected with a gearbox (2); the shield machine emergency sealing method comprises the following steps: remove the first connecting screw (4) for installing the protection gasket (5) on the front shield (3), and remove the second connecting screw (6) for installing the protection gasket (5) on the main drive (8), wherein the protection gasket (5) is a gasket on the front side of the gap between the front shield (3) and the main drive (8); install the shield connecting ring (10) on the front side of the front shield (3) and detachably fixedly connect the shield connecting ring (10) by the shield connecting screw (13) matched with the hole of the first connecting screw (4) on the front shield (3); install the drive connecting ring (16) on the front side of the main drive (8) and detachably fixedly connect the drive connecting ring (16) by the drive connecting screw (15) matched with the hole of the second connecting screw (6) on the main drive (8); and arrange the sealing ring (12) in the cavity between the shield connecting ring (10) and the drive connecting ring (16) to seal the gap between the front shield (3) and the main drive (8) on the front side of the sealing assembly (7).

2. The method of claim 1, wherein, The shield connecting ring (10) and / or the drive connecting ring (16) is provided with an oil injection port (17) for injecting oil to the sealing ring (12).

3. The method of claim 2, wherein, The drive connecting ring (16) is provided with at least one radial through oil injection port (17), and the outlet end of the oil injection port (17) is located at the cavity between the adjacent two sealing rings (12).

4. The method of claim 3, wherein, Also include shield connecting screw (13) and drive connecting screw (15), the shield connecting screw (13) passes through the sealing compression ring (14) in order, the shield connecting ring (10) is fixedly connected with the front shield (3) after, the drive connecting screw (15) passes through the drive connecting ring (16) after being connected with the main drive (8);The annular gap is formed between the shield connecting ring (10) and the drive connecting ring (16), in the annular gap, the compression part of the sealing compression ring (14), the sealing ring (12) on the front side, the isolation ring (11) and the sealing ring (12) on the rear side are distributed in order along the axial direction to the rear direction, the compression part of the sealing compression ring (14) is matched with the annular gap.

5. The method of claim any one of claims 1-4, wherein, One side of the sealing ring (12) is fixedly connected with one of the shield connecting ring (10) and the drive connecting ring (16);The other side of the sealing ring (12) forms a forwardly inclined contact angle to be in sealing contact with the other of the shield connecting ring (10) and the drive connecting ring (16).

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