Main drive sealing system of heading machine and control method thereof

Abstract

The application discloses a main driving sealing system of a heading machine and a control method thereof, which is arranged between an outer rotating ring and an inner fixed ring of a main driving device of the heading machine, and comprises a bidirectional sealing ring and at least one unidirectional sealing ring arranged in sequence from inside to outside along a heading direction of the heading machine, wherein the inner fixed ring is provided with a pressure monitoring module and an auxiliary support structure at a position corresponding to the bidirectional sealing ring. The bidirectional sealing ring can preferably protect the main bearing, and after the front unidirectional sealing ring fails, the bidirectional sealing ring still has a certain sealing effect, which prevents foreign impurities from entering the inside of the main driving, and effectively avoids the problem that foreign impurities have entered the inside of the main driving when the failed sealing ring is replaced.

Description

Technical Field

[0001] This invention relates to the field of tunneling machine main drive sealing technology, and in particular to a tunneling machine main drive sealing system and its control method. Background Technology

[0002] Tunnel boring machines (TBMs) play a vital role in underground engineering construction. The main drive seal, acting as the TBM's immune system, is crucial in blocking external media and is a key factor in ensuring the safe operation of the equipment. Current TBM main drive seal systems typically employ a multi-layered rubber seal combination within a sealed cavity, which is then continuously extruded with grease to achieve a sealing effect.

[0003] In the aforementioned process, a combination of multiple rubber seals with their lips facing forward (in the tunneling direction of the tunneling machine) and one rubber seal with its lip facing backward (opposite to the tunneling direction) is typically used. The forward-facing rubber seals prevent external mud and sand from entering the sealing cavity. However, due to sudden changes in the external environment and seal wear, the forward-facing seals are prone to failure. Once all the forward-facing seals fail, the last rearward-facing seal is ineffective at blocking impurities at the front end. Mud and sand can easily enter the sealing cavity through the last seal and enter the main bearing, potentially causing the main bearing to malfunction and affecting continuous tunneling operations. Furthermore, there are no timely and effective remedial measures after the failure of the first few rubber seals. Therefore, it is essential to design a main drive sealing system for tunneling machines that can better protect the main bearing. Summary of the Invention

[0004] The purpose of this invention is to provide a main drive sealing system and its control method for a tunneling machine. The bidirectional sealing ring in the sealing system can provide better protection for the main bearing. Even after the front unidirectional sealing ring fails, the bidirectional sealing ring still has a certain sealing effect, preventing external impurities from entering the interior of the main drive. This effectively avoids the problem that external impurities have already entered the interior of the main drive when the failed sealing ring is replaced.

[0005] The above-mentioned objectives of this invention are mainly achieved by the following technical solutions:

[0006] On one hand, the present invention provides a main drive sealing system for a tunneling machine, which is arranged between an outer rotating ring and an inner fixed ring of the main drive device of the tunneling machine. The main drive sealing system includes a bidirectional sealing ring and at least one unidirectional sealing ring arranged sequentially from the inside to the outside along the tunneling direction of the tunneling machine. The inner fixed ring is provided with a pressure monitoring module at the position corresponding to the bidirectional sealing ring.

[0007] In a preferred embodiment of the present invention, the bidirectional sealing ring has a first sealing lip facing at least one of the unidirectional sealing rings and a second sealing lip facing opposite to the first sealing lip, and the pressure monitoring module is located at a position opposite to the first sealing lip.

[0008] In a preferred embodiment of the present invention, the pressure monitoring module has a pressure sensor located on the outer surface of the inner fixing ring. The first sealing lip is provided with a boss, which can abut against the pressure sensor when the first sealing lip is subjected to hydraulic pressure.

[0009] In a preferred embodiment of the present invention, the inner fixing ring is further provided with an auxiliary support structure at the position corresponding to the bidirectional sealing ring. The auxiliary support structure is located between the first sealing lip and the second sealing lip. When the pressure monitoring module detects that the first sealing lip is deformed, the auxiliary support structure can be opened to support the first sealing lip and the second sealing lip.

[0010] In a preferred embodiment of the present invention, the auxiliary support structure includes an expansion member located on the inner fixing ring. When the pressure monitoring module detects deformation of the first sealing lip, the expansion member can deform to support the first sealing lip and the second sealing lip.

[0011] In a preferred embodiment of the present invention, the expansion member is an airbag, and the auxiliary support structure further includes a vent pipe. The vent pipe passes through the inner fixing ring. When the first sealing lip is deformed, the pressure monitoring module can send a control signal to control the introduction of gas medium into the vent pipe.

[0012] In a preferred embodiment of the present invention, a detection cavity is formed between at least one of the unidirectional sealing rings and the bidirectional sealing rings, and a flushing channel communicating with the detection cavity is provided on the inner fixing ring.

[0013] In a preferred embodiment of the present invention, at least one of the unidirectional sealing rings has a sealing cavity formed on the side away from the bidirectional sealing ring, and the inner fixing ring is provided with an oil cleanliness monitoring module corresponding to the sealing cavity.

[0014] In a preferred embodiment of the present invention, at least one of the one-way sealing rings includes a first one-way sealing ring, a second one-way sealing ring, and a third one-way sealing ring arranged sequentially adjacent to each other. The sealing lips of the first one-way sealing ring, the second one-way sealing ring, and the third one-way sealing ring are arranged in the same direction and all face the front side of the tunneling machine. The detection cavity is formed between the two-way sealing ring and the third one-way sealing ring, and the sealing cavity is formed between the third one-way sealing ring and the second one-way sealing ring.

[0015] In a preferred embodiment of the present invention, the oil cleanliness monitoring module has a cleanliness sensor, which is disposed on the outer wall of the inner fixing ring and corresponds to the sealing cavity.

[0016] In a preferred embodiment of the present invention, along the circumferential direction of the main drive device, a plurality of pressure monitoring modules and a plurality of auxiliary support structures are spaced apart on the inner fixing ring.

[0017] In a preferred embodiment of the present invention, along the circumferential direction of the main drive device, a plurality of oil cleanliness monitoring modules and the flushing channel are provided at intervals on the inner fixing ring.

[0018] On the other hand, the present invention also provides a control method for a main drive sealing system of a tunneling machine, wherein the control method is implemented using the main drive sealing system of the tunneling machine as described above, and the control method includes:

[0019] When the pressure monitoring module detects deformation of the bidirectional sealing ring, it sends a control signal to stop the main drive unit of the tunneling machine from rotating, and the operator replaces the failed sealing ring in the main drive unit.

[0020] In a preferred embodiment of the present invention, the tunneling machine main drive sealing system further includes:

[0021] An auxiliary support structure is located at the position of the inner fixing ring corresponding to the bidirectional sealing ring;

[0022] A detection cavity is formed between at least one of the one-way sealing rings and the two-way sealing rings, and a flushing channel communicating with the detection cavity is provided on the inner fixing ring.

[0023] At least one of the unidirectional sealing rings forms a sealing cavity on the side away from the bidirectional sealing ring, and the inner fixing ring is provided with an oil cleanliness monitoring module at the sealing cavity;

[0024] The control method further includes:

[0025] When the pressure monitoring module detects deformation of the bidirectional sealing ring, the auxiliary support structure is activated to support the bidirectional sealing ring.

[0026] When the oil cleanliness monitoring module detects that the cleanliness of the oil in the sealing cavity is less than the cleanliness threshold, the main drive device of the tunneling machine is stopped, and flushing medium is introduced into the flushing channel to clean the sealing cavity.

[0027] Compared with the prior art, the technical solution of the present invention has the following characteristics and advantages:

[0028] 1. The tunneling machine main drive sealing system of the present invention uses a bidirectional sealing ring instead of a conventional unidirectional sealing ring. After the failure of the first few unidirectional sealing rings, the bidirectional sealing ring still has a certain sealing effect, preventing impurities that enter through the failed sealing ring from entering the main drive device. This effectively avoids the problem that external impurities have already entered the main drive device through the failed sealing ring when the failed sealing ring is replaced.

[0029] 2. The main drive sealing system of the tunneling machine described in this invention has a pressure monitoring module and an auxiliary support structure at the lower part of the bidirectional sealing ring. When the pressure monitoring module detects that the sealing lip of the bidirectional sealing ring has undergone significant deformation, the auxiliary support structure is activated to support the bidirectional sealing ring, preventing the sealing lip of the bidirectional sealing ring from being crushed and extending its service life.

[0030] 3. The main drive sealing system of the tunneling machine described in this invention is provided with an oil cleanliness monitoring module in the sealing cavity. When the oil cleanliness monitoring module detects that the cleanliness of the oil in the sealing cavity is less than the cleanliness threshold, a flushing medium is introduced into the flushing channel to clean the sealing cavity and ensure the stable operation of the sealing system.

[0031] 4. The control method for the main drive sealing system of the tunneling machine described in this invention can monitor the pressure state of the bidirectional sealing ring and the cleanliness of the oil in the sealing cavity in real time, and adjust the operation process in real time according to the monitored data, so that the tunneling machine can carry out tunneling operations safely and stably. Attached Figure Description

[0032] 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. In the drawings:

[0033] Figure 1 This is a schematic diagram of the main drive sealing system of the tunneling machine described in this invention;

[0034] Figure 2 This is a schematic diagram of the first state structure of the bidirectional sealing ring described in this invention;

[0035] Figure 3 This is a schematic diagram of the second state structure of the bidirectional sealing ring described in this invention;

[0036] Figure 4 This is a schematic diagram of the auxiliary support structure of the present invention supporting the bidirectional sealing ring.

[0037] Explanation of icon numbers:

[0038] 10. Outer rotating ring component;

[0039] 20. Inner fixing ring; 21. First threading hole; 22. Second threading hole; 23. Flushing channel; 24. Pipe hole;

[0040] 30. Bidirectional sealing ring; 31. First sealing lip; 311. Boss; 32. Second sealing lip;

[0041] 40. First one-way sealing ring; 41. Second one-way sealing ring; 42. Third one-way sealing ring; 43. Sealing spacer ring; 44. Detection chamber; 45. Sealing chamber;

[0042] 50. Pressure monitoring module; 51. Pressure sensor;

[0043] 60. Auxiliary support structure; 61. Expansion component; 62. Vent pipe;

[0044] 70. Oil cleanliness monitoring module; 71. Oil cleanliness sensor;

[0045] X, tunneling direction. Detailed Implementation

[0046] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0047] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0049] Implementation Method 1:

[0050] like Figure 1 As shown, the present invention provides a main drive sealing system for a tunneling machine, which is arranged between the outer rotating ring 10 and the inner fixed ring 20 of the main drive device of the tunneling machine. The main drive sealing system includes a bidirectional sealing ring 30 and at least one unidirectional sealing ring arranged sequentially from the inside to the outside along the tunneling direction X of the tunneling machine. A pressure monitoring module 50 is provided on the inner fixed ring 20 at the position corresponding to the bidirectional sealing ring 30.

[0051] The main drive unit of the tunneling machine described in this invention uses a bidirectional sealing ring 30 instead of a conventional unidirectional sealing ring. After the first few unidirectional sealing rings fail, the bidirectional sealing ring 30 still has a certain sealing effect, preventing impurities that pass through the failed sealing ring from entering the main drive unit. This effectively avoids the problem that external impurities have already entered the main drive unit through the failed sealing ring when the failed sealing ring is replaced.

[0052] Meanwhile, a pressure monitoring module 50 is provided at the lower part of the bidirectional sealing ring 30. The deformation state of the bidirectional sealing ring 30 is monitored in real time by the pressure monitoring module 50. Operators can replace the failed sealing ring according to the monitoring results of the pressure monitoring module 50 to avoid the sealing lip of the bidirectional sealing ring 30 being crushed.

[0053] Specifically, such as Figure 1As shown, a gap is formed between the outer rotating ring 10 and the inner fixed ring 20 of the main drive unit of the tunneling machine. To prevent impurities at the front end of the tunneling machine from entering this gap, multiple sealing rings need to be installed in this gap to ensure the stable operation of the main drive unit. A bidirectional sealing ring 30 and at least one unidirectional sealing ring are sequentially arranged from the inside to the outside along the tunneling direction X of the tunneling machine. The bidirectional sealing ring 30 and at least one unidirectional sealing ring are fixed to the inner wall of the outer rotating ring 10 by a sealing spacer 43. The sealing lips of the bidirectional sealing ring 30 and the sealing lips of the at least one unidirectional sealing ring abut against the outer wall of the inner fixed ring 20. The sealing lips of the at least one unidirectional sealing ring face the front of the main drive unit, effectively blocking the entry of impurities. The bidirectional sealing ring 30 has sealing lips on both sides, achieving bidirectional sealing, preventing impurities entering through the unidirectional sealing ring and also preventing lubricating oil inside the main drive structure from flowing out through the bidirectional sealing ring 30.

[0054] According to one embodiment of the present invention, such as Figure 1 As shown, at least one unidirectional sealing ring includes a first unidirectional sealing ring 40, a second unidirectional sealing ring 41, and a third unidirectional sealing ring 42 arranged sequentially adjacent to each other. The sealing lips of the first unidirectional sealing ring 40, the second unidirectional sealing ring 41, and the third unidirectional sealing ring 42 are arranged in the same direction and all face the front side of the tunneling machine. A detection cavity 44 is formed between the bidirectional sealing ring 30 and the third unidirectional sealing ring 42, and a sealing cavity 45 is formed between the third unidirectional sealing ring 42 and the second unidirectional sealing ring 41.

[0055] The third one-way sealing ring 42, the second one-way sealing ring 41, and the first one-way sealing ring 40 are arranged sequentially along the tunneling direction X of the tunneling machine, providing a multi-seal structure for the main drive device. By continuously introducing grease into the annular space formed between the one-way sealing rings, lubrication is ensured between the outer rotating ring 10 and the inner fixed ring 20. At the same time, the grease is continuously squeezed out from the gap, which can further prevent impurities such as slag from entering the gap.

[0056] Specifically, such as Figure 1 As shown, a sealing spacer ring 43 is provided between the first one-way sealing ring 40 and the second one-way sealing ring 41, and between the second sealing ring and the third one-way sealing ring 42. The sealing spacer ring 43 fixes the first one-way sealing ring 40, the second one-way sealing ring 41 and the third one-way sealing ring 42 to the outer rotating ring 10.

[0057] According to one embodiment of the present invention, such as Figures 1 to 4 As shown, the bidirectional sealing ring 30 has a first sealing lip 31 facing at least one unidirectional sealing ring and a second sealing lip 32 facing opposite to the first sealing lip 31, and the pressure monitoring module 50 is located at a position opposite to the first sealing lip 31.

[0058] Furthermore, an auxiliary support structure 60 is provided at the position of the inner fixing ring 20 corresponding to the bidirectional sealing ring 30. The auxiliary support structure 60 is located between the first sealing lip 31 and the second sealing lip 32. When the pressure monitoring module 50 detects deformation of the first sealing lip 31, the auxiliary support structure 60 can open to support the first sealing lip 31 and the second sealing lip 32. The first sealing lip 31 and the second sealing lip 32 in the bidirectional sealing ring 30 can achieve sealing on both sides of the bidirectional sealing ring 30. The pressure monitoring module 50 can sense the degree of deformation of the first sealing lip 31. If the pressure monitoring module 50 senses that the deformation of the first sealing lip 31 is too large, it controls the auxiliary support structure 60 to open, supporting the first sealing lip 31 and the second sealing lip 32 upwards, preventing the first sealing lip 31 from being crushed due to excessive pressure.

[0059] Specifically, such as Figure 1 As shown, the bidirectional sealing ring 30 and the third unidirectional sealing ring 42 are arranged adjacent to each other. A sealing spacer 43 is provided between the third unidirectional sealing ring 42 and the bidirectional sealing ring 30. The sealing spacer 43 is used to fix the bidirectional sealing ring 30 to the outer rotating ring 10. The first sealing lip 31 and the second sealing lip 32 are symmetrically arranged and abut against the outer surface of the inner fixing ring 20. The first sealing lip 31 is oriented towards the third unidirectional sealing ring 42 to prevent the sealing grease on the front side of the main drive device from entering the rear side of the main drive device. The second sealing lip 32 is oriented in the opposite direction to the first sealing lip 31 to prevent the lubricating grease on the rear side of the main drive device from entering the front side of the main drive device.

[0060] According to one embodiment of the present invention, such as Figures 2 to 4 As shown, the pressure monitoring module 50 has a pressure sensor 51, which is located on the outer surface of the inner fixing ring 20. The first sealing lip 31 is provided with a boss 311. When the first sealing lip 31 is subjected to hydraulic pressure, the boss 311 can abut against the pressure sensor 51.

[0061] Specifically, such as Figure 2 As shown, a second wire-passing hole 22 is provided on the inner fixing ring 20, and a groove is provided on the outer wall of the inner fixing ring 20 corresponding to the position of the first sealing lip 31. The pressure sensor 51 is disposed in the groove, and the data transmission line passes through the second wire-passing hole 22 and is connected to the pressure sensor 51. A boss 311 is provided on the side of the second sealing lip 32 near the outer side of the inner fixing ring 20, and the protruding position of the boss 311 corresponds to the position of the pressure sensor 51. Figure 3As shown, after the first sealing lip 31 deforms under the pressure of the oil, the boss 311 can abut against the pressure sensor 51. When the pressure sensor 51 detects the pressure of the boss 311, it transmits the deformation state of the first sealing lip 31 through the data transmission line.

[0062] Furthermore, the auxiliary support structure 60 includes an expansion member 61, which is located on the inner fixing ring 20. When the pressure monitoring module 50 detects deformation of the first sealing lip 31, the expansion member 61 can deform to support the first sealing lip 31 and the second sealing lip 32. This invention provides an expansion member 61 that can expand after excessive deformation of the bidirectional sealing ring 30 to support the first sealing lip 31 and the second sealing lip 32, effectively preventing the bidirectional sealing ring 30 from being crushed and extending its service life.

[0063] Specifically, such as Figures 2 to 4 As shown, the expansion member 61 is located in the space formed between the first sealing lip 31, the second sealing lip 32, and the inner fixing ring 20. In this embodiment, the expansion member 61 is an airbag, and the auxiliary support structure 60 also includes a vent pipe 62, which is connected to the airbag. The inner fixing ring 20 has a through hole 24, and the vent pipe 62 passes through the through hole 24. When the first one-way sealing ring 40, the second one-way sealing ring 41, and the third one-way sealing ring 42 fail, the grease carrying impurities will enter the detection cavity 44 between the third one-way sealing ring 42 and the bidirectional sealing ring 30. The first sealing lip 31 of the bidirectional sealing ring 30 will deform under the pressure of the grease. When the pressure sensor 51 detects that the first sealing lip 31 is deformed by pressure and the boss 311 abuts against the pressure sensor 51 (e.g. Figure 3 As shown), the pressure monitoring module 50 can send a control signal to control the introduction of gas medium into the vent pipe 62. The gas medium enters the airbag through the vent pipe 62, and the airbag inflates and pushes up the first sealing lip 31 and the second sealing lip 32 (as shown). Figure 4 (As shown), to prevent the first sealing lip 31 from failing due to excessive deformation.

[0064] According to one embodiment of the present invention, a plurality of pressure monitoring modules 50 and a plurality of auxiliary support structures 60 are provided at intervals on the inner fixing ring 20 along the circumferential direction of the main drive device.

[0065] Along the circumference of the main drive unit, multiple pressure monitoring modules 50 and multiple auxiliary support structures 60 are spaced apart to simultaneously monitor multiple positions of the first sealing lip 31 of the bidirectional sealing ring 30, avoiding the problem that a single monitoring point is difficult to effectively monitor the entire annular first sealing lip 31.

[0066] According to one embodiment of the present invention, such as Figure 1As shown, a detection cavity 44 is formed between at least one unidirectional sealing ring and a bidirectional sealing ring 30, and a flushing channel 23 communicating with the detection cavity 44 is provided on the inner fixing ring 20. The flushing channel 23 is used to introduce flushing medium into the detection cavity 44, so as to clean the detection cavity 44 and the sealing cavity 45 in front of the detection cavity 44 when the detection cavity 44 needs to be cleaned.

[0067] Furthermore, such as Figure 1 As shown, at least one unidirectional sealing ring has a sealing cavity 45 formed on the side away from the bidirectional sealing ring 30, and an oil cleanliness monitoring module 70 is provided on the inner fixing ring 20 corresponding to the sealing cavity 45. The oil cleanliness monitoring module 70 can monitor the cleanliness of the oil in the sealing cavity 45 in real time, and control the opening and closing of the flushing channel 23 according to the cleanliness of the sealing cavity 45.

[0068] Specifically, such as Figure 1 As shown, a sealing cavity 45 is formed between the third one-way sealing ring 42 and the second one-way sealing ring 41. A groove is provided on the outer wall of the inner fixing ring 20 at the position corresponding to the sealing cavity 45. The oil cleanliness monitoring module 70 has an oil cleanliness sensor 71, which is installed in the groove. A first wire hole 21 is provided on the inner fixing ring 20, and the data transmission line passes through the first wire hole 21 and is electrically connected to the oil cleanliness sensor 71. When the first one-way sealing ring 40 and the second one-way sealing ring 41 fail or other reasons cause the cleanliness of the oil in the sealing cavity 45 to be lower than the cleanliness threshold, the flushing channel 23 is opened, and flushing medium is introduced into the detection cavity 44 through the flushing channel 23. The flushing medium enters the sealing cavity 45 through the third one-way sealing ring 42 to clean the sealing cavity 45.

[0069] According to one embodiment of the present invention, along the circumferential direction of the main drive device, a plurality of oil cleanliness monitoring modules 70 and flushing channels 23 are provided at intervals on the inner fixing ring 20. The plurality of oil cleanliness sensors 71 can monitor the oil cleanliness at multiple locations of the entire annular sealing cavity 45 in real time, and the plurality of flushing channels 23 can clean the entire annular detection cavity 44 and sealing cavity 45.

[0070] Implementation Method Two:

[0071] The present invention also provides a control method for the main drive sealing system of a tunneling machine. The control method is implemented using the main drive sealing system of the tunneling machine described in Embodiment 1. The control method includes: when the pressure monitoring module 50 detects deformation of the bidirectional sealing ring 30, the pressure monitoring module 50 sends a control signal to stop the main drive device of the tunneling machine from rotating, and the operator replaces the failed sealing ring in the main drive device.

[0072] Specifically, the pressure sensor 51 monitors the pressure signal in real time. If no signal is detected, it indicates that the deformation of the bidirectional sealing ring 30 is small, the protrusion 311 on the first sealing lip 31 is not in contact with the inner fixing ring 20, and the tunneling machine maintains normal tunneling operation. If the pressure sensor 51 detects a signal, it indicates that the pressure in the detection chamber 44 is large, the protrusion 311 of the first sealing lip 31 is in contact with the pressure sensor 51, and at this time it indicates that the first one-way sealing ring 40, the second one-way sealing ring 41, and the third one-way sealing ring 42 have lost their function. The system controls the main drive device to stop rotating according to the signal, the alarm light stays on, and the alarm is triggered. On-site personnel can determine whether the conditions for shutdown and maintenance are met based on the current geological conditions. If the conditions are met, shutdown and maintenance are carried out, and the failed sealing rings are replaced or repaired. If the conditions are not met, tunneling continues until the shutdown conditions are met, and then shutdown and maintenance are carried out, and the failed sealing rings are replaced or repaired.

[0073] According to one embodiment of the present invention, the control method for the main drive sealing system of a tunneling machine further includes:

[0074] When the pressure monitoring module 50 detects deformation of the bidirectional sealing ring 30, the auxiliary support structure 60 is activated to support the bidirectional sealing ring 30.

[0075] When the oil cleanliness monitoring module 70 detects that the cleanliness of the oil in the sealing cavity 45 is less than the cleanliness threshold, the main drive device of the tunneling machine is stopped, and flushing medium is introduced into the flushing channel 23 to clean the sealing cavity 45.

[0076] Specifically, if the pressure sensor 51 detects a signal, the system controls the main drive device to stop rotating according to the signal, the alarm light stays on, and the alarm is triggered. At this time, the auxiliary support structure 60 is activated, and the airbag is pressurized through the vent pipe 62 and expands outward to fit against the bidirectional sealing ring 30 to provide support, which can effectively prevent the bidirectional sealing ring 30 from being crushed.

[0077] Furthermore, the oil cleanliness sensor 71 can monitor the presence of impurity particles in the oil within the sealing cavity 45 in real time. When impurity particles are present, the cutterhead continues to rotate but stops feeding in the X direction of tunneling, the oil injection is shut off, the flushing channel 23 opens, and flushing medium is injected into the detection cavity 44 to expel as many impurity particles as possible from the sealing cavity 45, ensuring the cleanliness of the oil within the sealing cavity 45 and keeping the sealing ring in a normal state of friction and wear. If impurities in the oil enter the detection cavity 44 for other reasons, the bidirectional sealing ring 30 can still function as a seal even with a small amount of oil.

[0078] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. 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, arranged between an outer rotating ring (10) and an inner fixed ring (20) of the main drive unit of the tunneling machine, characterized in that, The main drive sealing system of the tunneling machine includes a bidirectional sealing ring (30) and at least one unidirectional sealing ring arranged sequentially from the inside to the outside along the tunneling direction (X) of the tunneling machine. The inner fixing ring (20) is provided with a pressure monitoring module (50) at the position corresponding to the bidirectional sealing ring (30). The bidirectional sealing ring (30) has a first sealing lip (31) facing at least one of the unidirectional sealing rings and a second sealing lip (32) facing opposite to the first sealing lip (31), and the pressure monitoring module (50) is located at a position opposite to the first sealing lip (31); The inner fixing ring (20) is also provided with an auxiliary support structure (60) at the position corresponding to the bidirectional sealing ring (30). The auxiliary support structure (60) is located between the first sealing lip (31) and the second sealing lip (32). When the pressure monitoring module (50) detects that the first sealing lip (31) is deformed, the auxiliary support structure (60) can be opened to support the first sealing lip (31) and the second sealing lip (32). The pressure monitoring module (50) has a pressure sensor (51), which is located on the outer side of the inner fixing ring (20). The first sealing lip (31) is provided with a boss (311). When the first sealing lip (31) is subjected to hydraulic pressure, the boss (311) can abut against the pressure sensor (51). The auxiliary support structure (60) includes an expansion member (61) located on the inner fixing ring (20). When the pressure monitoring module (50) detects that the first sealing lip (31) is deformed, the expansion member (61) can deform to support the first sealing lip (31) and the second sealing lip (32).

2. The main drive sealing system for a tunneling machine according to claim 1, characterized in that, The expansion member (61) is an airbag, and the auxiliary support structure (60) also includes a vent pipe (62). The vent pipe (62) passes through the inner fixing ring (20). When the first sealing lip (31) is deformed, the pressure monitoring module (50) can send a control signal to control the introduction of gas medium into the vent pipe (62).

3. The main drive sealing system for a tunneling machine according to claim 1, characterized in that, A detection cavity (44) is formed between at least one of the unidirectional sealing rings and the bidirectional sealing ring (30), and a flushing channel (23) communicating with the detection cavity (44) is provided on the inner fixing ring (20).

4. The main drive sealing system for a tunneling machine according to claim 3, characterized in that, At least one of the unidirectional sealing rings has a sealing cavity (45) formed on the side away from the bidirectional sealing ring (30), and the inner fixing ring (20) is provided with an oil cleanliness monitoring module (70) corresponding to the sealing cavity (45).

5. The main drive sealing system for a tunneling machine according to claim 4, characterized in that, At least one of the unidirectional sealing rings includes a first unidirectional sealing ring (40), a second unidirectional sealing ring (41), and a third unidirectional sealing ring (42) arranged sequentially adjacent to each other. The sealing lips of the first unidirectional sealing ring (40), the second unidirectional sealing ring (41), and the third unidirectional sealing ring (42) are arranged in the same direction and all face the front side of the tunneling machine. The detection cavity (44) is formed between the bidirectional sealing ring (30) and the third unidirectional sealing ring (42), and the sealing cavity (45) is formed between the third unidirectional sealing ring (42) and the second unidirectional sealing ring (41).

6. The main drive sealing system for a tunneling machine according to claim 4, characterized in that, The oil cleanliness monitoring module (70) has a cleanliness sensor, which is located on the outer wall of the inner fixing ring (20) and corresponds to the sealing cavity (45).

7. The main drive sealing system for a tunneling machine according to claim 1, characterized in that, Along the circumferential direction of the main drive device, the inner fixing ring (20) is provided with a plurality of pressure monitoring modules (50) and a plurality of auxiliary support structures (60) at intervals.

8. The main drive sealing system for a tunneling machine according to claim 4, characterized in that, Along the circumferential direction of the main drive device, the inner fixing ring (20) is provided with a plurality of oil cleanliness monitoring modules (70) and the flushing channel (23) at intervals.

9. A control method for the main drive sealing system of a tunneling machine, characterized in that, The control method is implemented using the main drive sealing system of the tunneling machine as described in any one of claims 1 to 8. The control method includes: When the pressure monitoring module (50) detects deformation of the bidirectional sealing ring (30), the pressure monitoring module (50) sends a control signal to stop the main drive unit of the tunneling machine from rotating, and the operator replaces the failed sealing ring in the main drive unit.

10. The control method for the main drive sealing system of a tunneling machine according to claim 9, characterized in that, The tunneling machine's main drive sealing system also includes: An auxiliary support structure (60) is located at the position of the inner fixing ring (20) corresponding to the bidirectional sealing ring (30); A detection cavity (44) is formed between at least one of the one-way sealing rings and the two-way sealing rings (30), and a flushing channel (23) communicating with the detection cavity (44) is provided on the inner fixing ring (20). At least one of the unidirectional sealing rings forms a sealing cavity (45) on the side away from the bidirectional sealing ring (30), and the inner fixing ring (20) is provided with an oil cleanliness monitoring module (70) corresponding to the sealing cavity (45). The control method further includes: When the pressure monitoring module (50) detects the deformation of the bidirectional sealing ring (30), the auxiliary support structure (60) is activated to support the bidirectional sealing ring (30). When the oil cleanliness monitoring module (70) detects that the cleanliness of the oil in the sealing cavity (45) is less than the cleanliness threshold, the main drive device of the tunneling machine is stopped, and flushing medium is introduced into the flushing channel (23) to clean the sealing cavity (45).

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