Sealing device

Abstract

This invention provides a sealing device. The sealing device includes a grease injection assembly and a sealing assembly. The sealing assembly includes a sealing sleeve and at least two sealing elements, which are spaced apart and fitted onto the rotating shaft of a tunnel boring machine (TBM). The sealing sleeve is fitted onto the sealing elements, with the inner wall of the sealing element abutting against the rotating shaft and the outer wall of the sealing element abutting against the sealing sleeve. A receiving cavity is formed between at least two adjacent sealing elements for containing grease. The grease injection assembly includes a first detector, a second detector, a controller, and a regulating valve. The first detector, the second detector, and the regulating valve are all electrically connected to the controller. The regulating valve communicates with the receiving cavity. The first detector is configured to detect the temperature of the TBM's soil chamber, the second detector is configured to detect the pressure of the soil chamber, and the controller is configured to control the opening of the regulating valve based on the temperature and pressure to change the flow rate of grease entering the receiving cavity. The sealing device provided by this invention has high sealing reliability.

Description

Technical Field

[0001] This invention relates to the field of construction machinery technology, and in particular to a sealing device. Background Technology

[0002] The slewing center of the tunnel boring machine (TBM) is installed at the rear of the cutterhead and rotates synchronously with it. It serves as the connecting hub for several injection pipelines for soil amendment fluid in front of the cutterhead and the hydraulic pipelines for the hydraulically controlled cutting tools. If the sealing device of the slewing center leaks, the slag and moisture in the soil chamber will corrode and damage the main steel structure and main drive of the TBM, causing it to shut down and severely impacting tunneling efficiency.

[0003] In related technologies, a sealing sleeve and a sealing cover are installed on the outer periphery of the front flange shaft of the tunnel boring machine. The sealing cover is located at one end of the sealing sleeve, and the inner cavity of the sealing sleeve and the side of the sealing cover facing the sealing sleeve form a sealing cavity. Multiple sealing rings are installed inside the sealing cavity. Grease is injected into the sealing cavity between the sealing rings using a grease pump through the grease injection port on the sealing sleeve.

[0004] However, the sealing rings in the above-mentioned sealing devices are easily damaged, causing sealing failure and resulting in low sealing reliability. Summary of the Invention

[0005] This invention provides a sealing device with high sealing reliability.

[0006] This invention provides a sealing device for a tunnel boring machine. The sealing device includes a grease injection assembly and a sealing assembly. The sealing assembly includes a sealing sleeve and at least two sealing elements. The at least two sealing elements are spaced apart and sleeved on the rotating shaft of the tunnel boring machine. The sealing sleeve is sleeved on the sealing elements. The inner wall of the sealing element abuts against the rotating shaft, and the outer wall of the sealing element abuts against the sealing sleeve. A receiving cavity is formed between the sealing sleeve and the rotating shaft. The receiving cavity is used to receive grease.

[0007] The grease injection assembly includes a first detector, a second detector, a controller, and a regulating valve. The first detector, the second detector, and the regulating valve are all electrically connected to the controller. The regulating valve is connected to the receiving cavity. The first detector is configured to detect the temperature of the soil chamber of the tunnel boring machine. The second detector is configured to detect the pressure of the soil chamber. The controller is configured to control the opening of the regulating valve according to the temperature and pressure to change the flow rate of grease entering the receiving cavity.

[0008] In one possible implementation, the sealing device provided by the present invention allows the controller to control the regulating valve to increase its opening degree when the temperature exceeds the maximum value of a first preset range.

[0009] In one possible implementation, the sealing device provided by the present invention allows the controller to control the regulating valve to increase its opening degree when the pressure exceeds the maximum value of a second preset range.

[0010] In a possible implementation, the sealing device provided by the present application, the controller comprises a temperature controller, a pressure controller, a main controller and a flow regulator, the temperature controller, the pressure controller and the flow regulator are electrically connected with the main controller.

[0011] The first detector is electrically connected with the temperature controller, the second detector is electrically connected with the pressure controller, and the adjusting valve is electrically connected with the flow regulator.

[0012] In a possible implementation, the sealing device provided by the present application, the grease injection assembly further comprises a flow transmitter, the flow transmitter is electrically connected with the main controller, the flow transmitter is in communication with the accommodation cavity and is located between the accommodation cavity and the adjusting valve, and the flow transmitter is used for detecting the flow of the grease entering the accommodation cavity.

[0013] In a possible implementation, the sealing device provided by the present application, the sealing assembly comprises a first sealing assembly and a second sealing assembly, the second sealing assembly is located on one side of the first sealing assembly along the axial direction of the rotating shaft, and the second sealing assembly is connected with the first sealing assembly.

[0014] The first sealing assembly comprises a first sealing sleeve and at least two first sealing members, the at least two first sealing members are sleeved on the rotating shaft at intervals, the first sealing sleeve is sleeved on the first sealing members, the inner wall of the first sealing member abuts against the rotating shaft, and the outer wall of the first sealing member abuts against the first sealing sleeve, and the first sealing sleeve forms a first accommodation cavity with the rotating shaft.

[0015] The second sealing assembly comprises a second sealing sleeve and at least two second sealing members, the at least two second sealing members are sleeved on the rotating shaft at intervals, the second sealing sleeve is sleeved on the second sealing members, the inner wall of the second sealing member abuts against the rotating shaft, and the outer wall of the second sealing member abuts against the second sealing sleeve, and a second accommodation cavity is formed between the at least two adjacent second sealing members.

[0016] In a possible implementation, the sealing device provided by the present application, the second sealing sleeve comprises a first splicing ring and a second splicing ring, the first splicing ring and the second splicing ring are oppositely arranged, and the two ends of the first splicing ring are detachably connected with the two ends of the second splicing ring one by one.

[0017] In a possible implementation, the sealing device provided by the present application, the two ends of the first splicing ring are each provided with a first connecting part, the two ends of the second splicing ring are each provided with a second connecting part, and the two first connecting parts are detachably connected with the two second connecting parts one by one.

[0018] In one possible implementation, the sealing device provided by the present invention has at least one first positioning part at each end of the first splicing ring, and at least one second positioning part at each end of the second splicing ring, with at least two first positioning parts and at least two second positioning parts connected in a one-to-one correspondence.

[0019] In one possible implementation, the sealing device provided by the present invention has at least two mounting grooves on the inner wall of the second sealing sleeve, and the at least two mounting grooves are respectively provided with at least two second sealing elements, with the second sealing elements located in the mounting grooves.

[0020] The second sealing sleeve is provided with at least two grease injection holes, which are arranged opposite each other and located between at least two mounting grooves. The grease injection holes are in communication with the second receiving cavity.

[0021] The sealing device provided by this invention comprises a grease injection assembly and a sealing assembly. The sealing assembly includes a sealing sleeve and at least two sealing elements. The at least two sealing elements are spaced apart and fitted onto the rotating shaft of the tunnel boring machine (TBM). The sealing sleeve is fitted onto the sealing elements, with the inner wall of the sealing element abutting against the rotating shaft and the outer wall of the sealing element abutting against the sealing sleeve. A receiving cavity is formed between the sealing sleeve and the rotating shaft to hold grease, which reduces wear on the sealing elements. The grease injection assembly includes a first detector, a second detector, a controller, and a regulating valve. The first detector, the second detector, and the regulating valve are all electrically connected to the controller. The regulating valve is connected to the receiving cavity. The first detector detects the temperature of the TBM's soil chamber, and the second detector detects the pressure of the soil chamber. The controller controls the opening of the regulating valve based on the temperature and pressure, thereby changing the flow rate of grease entering the receiving cavity. Thus, the grease flow rate can be adaptively adjusted when the TBM operates in different geological formations, effectively reducing wear on the sealing elements in different formations, thereby effectively preventing seal damage and improving the reliability of the sealing device. 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 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 sealing device provided in an embodiment of the present invention;

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

[0025] Figure 3This is a schematic diagram of another structure of the sealing component in the sealing device provided in an embodiment of the present invention;

[0026] Figure 4 An exploded view of the second sealing sleeve in the sealing device provided in an embodiment of the present invention;

[0027] Figure 5 for Figure 4 A-direction view;

[0028] Figure 6 for Figure 3 Cross-sectional view of the central sealing assembly;

[0029] Figure 7 for Figure 3 Another cross-sectional view of the sealing assembly.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100-Grease injection assembly; 110-First detector; 120-Second detector; 130-Controller; 131-Temperature controller; 132-Pressure controller; 133-Main controller; 134-Flow regulator; 140-Control valve; 150-Flow transmitter; 160-Grease distributor;

[0032] 200-Sealing assembly; 210-Sealing sleeve; 220-Seal; 230-First sealing assembly; 231-First sealing sleeve; 2311-First sealing sleeve body; 2312-Cover plate; 232-First seal; 240-Second sealing assembly; 241-Second sealing sleeve; 2411-First splicing ring; 2411a-First connecting part; 2411b-First positioning part; 2412-Second splicing ring; 2412a-Second connecting part; 2412b-Second positioning part; 2413-Mounting groove; 242-Second seal; 243-Third seal; 244-Grease injection hole; 250-Spacer ring;

[0033] 300 - Receptacle; 400 - Grease pump; 500 - Rotating shaft; 600 - Soil chamber; 700 - First screw; 800 - Second screw; 900 - Locating pin. Detailed Implementation

[0034] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection via an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In the description of this invention, the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] The terms "first," "second," and "third" (if applicable) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0037] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or maintenance tool that includes a series of steps or units, not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or maintenance tool.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] In related technologies, a sealing sleeve and a sealing cover plate are installed on the outer periphery of the front flange shaft of the tunnel boring machine (TBM). The sealing cover plate is located at one end of the sealing sleeve, and the inner cavity of the sealing sleeve and the side of the sealing cover plate facing the sealing sleeve form a sealing cavity, in which multiple sealing rings are installed. Grease is injected into the sealing cavity between the sealing rings using a grease pump through the grease injection port on the sealing sleeve. However, the grease supply is constant, and when the TBM operates in high-temperature and high-pressure strata, the sealing rings are prone to damage, causing sealing failure and resulting in low sealing reliability.

[0040] Moreover, once the sealing ring is damaged and the seal fails, the sealing device is difficult to remove, making repairs inside the hole more difficult.

[0041] To address the aforementioned technical problems, the sealing device provided by this invention incorporates a grease injection assembly. This assembly includes a first detector, a second detector, a controller, and a regulating valve. The first detector, second detector, and regulating valve are all electrically connected to the controller. The regulating valve communicates with the receiving cavity. The detector is configured to detect the temperature of the soil chamber of the tunnel boring machine, the second detector is configured to detect the pressure of the soil chamber, and the controller is configured to control the opening of the regulating valve based on the temperature and pressure, thereby altering the flow rate of grease entering the receiving cavity. This allows for adjustment of the grease injection flow rate according to the temperature and pressure of the formation, achieving economic efficiency while effectively reducing the occurrence of seal damage.

[0042] Furthermore, the sealing sleeve in the sealing assembly is designed as a separate unit, which facilitates its removal from the rotating shaft of the tunnel boring machine, allowing for replacement of the seal and simplifying repairs. It also allows for the temporary installation of sealing assemblies, increasing the number of sealing components and improving the reliability of the sealing device.

[0043] Figure 1 This is a schematic diagram of the sealing device provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of a sealing component in a sealing device provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of another structure of the sealing component in the sealing device provided in an embodiment of the present invention.

[0044] See Figures 1 to 3 As shown, the sealing device provided by the present invention is used for a tunnel boring machine. The sealing device includes a grease injection assembly 100 and a sealing assembly 200. The sealing assembly 200 includes a sealing sleeve 210 and at least two sealing elements 220. The at least two sealing elements 220 are spaced apart and sleeved on the rotating shaft 500 of the tunnel boring machine. The sealing sleeve 210 is sleeved on the sealing elements 220. The inner wall of the sealing element 220 abuts against the rotating shaft 500, and the outer wall of the sealing element 220 abuts against the sealing sleeve 210. A receiving cavity 300 is formed between the sealing sleeve 210 and the rotating shaft 500. The receiving cavity 300 is used to receive grease.

[0045] The grease injection assembly 100 includes a first detector 110, a second detector 120, a controller 130, and a regulating valve 140. The first detector 110, the second detector 120, and the regulating valve 140 are all electrically connected to the controller 130. The regulating valve 140 is connected to the accommodating cavity 300. The first detector 110 is configured to detect the temperature of the soil chamber 600 of the tunnel boring machine. The second detector 120 is configured to detect the pressure of the soil chamber 600. The controller 130 is configured to control the opening of the regulating valve 140 according to the temperature and pressure to change the flow rate of grease entering the accommodating cavity 300.

[0046] It should be noted that the number of sealing components 200 can be one, two or more, and this embodiment does not limit the specific number of sealing components 200.

[0047] Specifically, the seal 220 can be a dynamic seal, such as a lip seal or a lip seal strip.

[0048] In order to achieve the positioning of the seal 220 along the axial direction of the rotation shaft 500, in some embodiments, a spacer 250 is provided between two adjacent seals 220, and both adjacent seals 220 abut against the spacer 250.

[0049] It should be noted that a receiving cavity 300 is formed between the sealing sleeve 210 and the rotating shaft 500 along the radial direction of the rotating shaft 500. A receiving cavity 300 can also be formed between two adjacent sealing elements 220 and between the sealing element 220 and the inner wall of the sealing sleeve 210 along the axial direction of the rotating shaft 500. Furthermore, the number of receiving cavities 300 can be one, two, or more. The sealing sleeve 210 has grease inlets communicating with the receiving cavities 300. These grease inlets can be correspondingly arranged one-to-one with each receiving cavity 300, allowing grease to be injected into the receiving cavity 300. Specifically, as shown in Figure 2, the number of receiving cavities 300 is three.

[0050] The grease pump 400 (e.g., an electric grease pump) is electrically connected to the controller 130 and is used to deliver grease into the accommodating cavity 300.

[0051] The sealing device provided in this embodiment includes a grease injection assembly 100 and a sealing assembly 200. The sealing assembly 200 includes a sealing sleeve 210 and at least two sealing elements 220. The at least two sealing elements 220 are spaced apart and sleeved on the rotating shaft 500 of the tunnel boring machine. The sealing sleeve 210 is sleeved on the sealing elements 220. The inner wall of the sealing element 220 abuts against the rotating shaft 500, and the outer wall of the sealing element 220 abuts against the sealing sleeve 210. A receiving cavity 300 is formed between at least two adjacent sealing elements 220. The receiving cavity 300 is used to receive grease, and the grease can reduce the wear of the sealing elements 220. The grease injection assembly 100 includes a first detector 110, a second detector 120, a controller 130, and a regulating valve 140. The first detector 110, the second detector 120, and the regulating valve 140 are all electrically connected to the controller 130. The regulating valve 140 is connected to the accommodating cavity 300. The first detector 110 detects the temperature of the soil chamber 600 of the tunnel boring machine, and the second detector 120 detects the pressure of the soil chamber 600. The controller 130 controls the opening of the regulating valve 140 according to the temperature and pressure, thereby changing the flow rate of grease entering the accommodating cavity 300. In this way, the flow rate of grease can be adaptively adjusted when the tunnel boring machine is working in different strata, thereby effectively reducing the wear of the seal 220 in different strata, effectively avoiding damage to the seal 220, and improving the reliability of the sealing device.

[0052] In one possible implementation, when the temperature exceeds the maximum value of a first preset range, the controller 130 is configured to control the regulating valve 140 to increase its opening.

[0053] For example, the first preset range is 40℃-70℃. When the first detector 110 detects that the temperature of the soil chamber 600 is greater than 70℃, the controller 130 controls the regulating valve 140 to increase the opening, thereby increasing the flow rate of grease into the accommodating cavity 300 and reducing the wear of the seal 220.

[0054] In some embodiments, when the temperature is less than the minimum of a first preset range, the controller 130 is configured to control the regulating valve 140 to reduce its opening.

[0055] In one possible implementation, when the pressure is greater than the maximum value of the second preset range, the controller 130 is configured to control the regulating valve 140 to increase its opening.

[0056] For example, the second preset range is 0-3 bar. When the second detector 120 detects that the pressure in the soil chamber 600 is greater than 3 bar, the controller 130 controls the regulating valve 140 to increase the opening, thereby increasing the flow rate of grease into the accommodating cavity 300 and reducing the wear of the seal 220.

[0057] In this embodiment, the controller 130 includes a temperature controller 131, a pressure controller 132, a main controller 133, and a flow regulator 134. The temperature controller 131, the pressure controller 132, and the flow regulator 134 are all electrically connected to the main controller 133.

[0058] The first detector 110 is electrically connected to the temperature controller 131, the second detector 120 is electrically connected to the pressure controller 132, and the regulating valve 140 is electrically connected to the flow regulator 134.

[0059] Temperature controller 131 is used to compare the temperature of soil chamber 600 detected by first detector 110 with a first preset range and transmit the comparison result to main controller 133.

[0060] The pressure controller 132 is used to compare the pressure of the soil chamber 600 detected by the second detector 120 with the second preset range, and transmit the comparison result to the main controller 133.

[0061] The main controller 133 processes the results transmitted by the temperature controller 131 and the pressure controller 132, and transmits a signal to increase the grease flow rate or a signal to decrease the grease flow rate to the flow regulator 134, which controls the opening of the regulating valve 140.

[0062] In one possible implementation, the sealing device provided by the present invention, the grease injection assembly 100 further includes a flow transmitter 150, which is electrically connected to the main controller 133, communicates with the accommodating cavity 300, and is located between the accommodating cavity 300 and the regulating valve 140. The flow transmitter 150 is used to detect the flow rate of grease entering the accommodating cavity 300.

[0063] Specifically, the main controller 133 processes the results transmitted by the temperature controller 131 and the pressure controller 132, calculates the required grease flow rate, and compares the required grease flow rate with the grease flow rate detected by the flow transmitter 150, thereby transmitting a signal to increase the grease flow rate or a signal to decrease the grease flow rate to the flow regulator 134, which controls the opening of the regulating valve 140.

[0064] It should be noted that when the sealing assembly 200 has at least two receiving cavities 300, the number of regulating valves 140 is at least two, and the at least two regulating valves 140 are arranged one-to-one with the at least two receiving cavities 300. In addition, the grease injection assembly 100 also includes a grease distributor 160, and the at least two regulating valves 140 are all connected to the grease distributor 160.

[0065] See Figure 3 As shown, in order to improve the sealing effect, the sealing assembly 200 includes a first sealing assembly 230 and a second sealing assembly 240. The second sealing assembly 240 is located on one side of the first sealing assembly 230 along the axial direction of the rotation axis 500, and the second sealing assembly 240 is connected to the first sealing assembly 230.

[0066] The first sealing assembly 230 includes a first sealing sleeve 231 and at least two first sealing elements 232. The at least two first sealing elements 232 are spaced apart and sleeved on the rotating shaft 500. The first sealing sleeve 231 is sleeved on the first sealing elements 232. The inner wall of the first sealing element 232 abuts against the rotating shaft 500, and the outer wall of the first sealing element 232 abuts against the first sealing sleeve 231. A first accommodating cavity is formed between the first sealing sleeve 231 and the rotating shaft 500.

[0067] Specifically, along the radial direction of the rotation shaft 500, a first receiving cavity is formed between the first sealing sleeve 231 and the rotation shaft 500; along the axial direction of the rotation shaft 500, a first receiving cavity can be formed between two adjacent first sealing members 232; and a first receiving cavity can be formed between the inner wall of the first sealing member 232 and the first sealing member 232. See also Figure 3 As shown, the number of first accommodating cavities is three.

[0068] Specifically, the first sealing sleeve 231 includes a first sealing sleeve body 2311 and a cover plate 2312. The first sealing sleeve body 2311 is fitted onto the first sealing element 232, and the cover plate 2312 covers the side of the first sealing sleeve body 2311 near the second sealing assembly 240. The first sealing element 232 can be a lip seal ring.

[0069] The second sealing assembly 240 includes a second sealing sleeve 241 and at least two second sealing elements 242. The at least two second sealing elements 242 are spaced apart and sleeved on the rotating shaft 500. The second sealing sleeve 241 is sleeved on the second sealing elements 242. The inner wall of the second sealing element 242 abuts against the rotating shaft 500, and the outer wall of the second sealing element 242 abuts against the second sealing sleeve 241. A second receiving cavity is formed between at least two adjacent second sealing elements 242.

[0070] Specifically, along the radial direction of the rotation shaft 500, a second receiving cavity is formed between the second sealing sleeve 241 and the rotation shaft 500; along the axial direction of the rotation shaft 500, a second receiving cavity is formed between two adjacent second sealing elements 242. See also Figure 3 As shown, there are two second seals 242 and one second accommodating cavity.

[0071] In this embodiment, the specific connection method between the second sealing component 240 and the first sealing component 230 is not limited. For example, the second sealing sleeve 241 can be connected to the first sealing sleeve 231 by screws, thereby realizing the connection between the second sealing component 240 and the first sealing component 230.

[0072] To improve the sealing effect, a third sealing element 243 is provided on the side of the second sealing sleeve 241 facing the first sealing sleeve 231. The third sealing element 243 is embedded in the second sealing sleeve 241, and one side of the third sealing element 243 abuts against the first sealing sleeve 231.

[0073] It is understood that the number of the first sealing component 230 and the second sealing component 240 can be one, two or more, and this embodiment does not make a specific limitation.

[0074] It should be noted that the sealing component 200 may include only the first sealing component 230, or the sealing component 200 may include only the second sealing component 240. The structures of the first sealing component 230 and the sealing component 200 may be the same as those in the above embodiments, and will not be described in detail here.

[0075] Figure 4 This is an exploded view of the second sealing sleeve in the sealing device provided in an embodiment of the present invention. Figure 5 for Figure 4 View from A in the middle, Figure 6 for Figure 3A cross-sectional view of the central sealing assembly. Figure 7 for Figure 3 Another cross-sectional view of the sealing assembly.

[0076] To facilitate the installation and disassembly of the second sealing assembly 240, the second sealing sleeve 241 includes a first splicing ring 2411 and a second splicing ring 2412. The first splicing ring 2411 and the second splicing ring 2412 are arranged opposite to each other, and the two ends of the first splicing ring 2411 and the two ends of the second splicing ring 2412 are detachably connected.

[0077] Specifically, the second seal 242 can be a lip seal.

[0078] It is understandable that by setting the first splicing ring 2411 and the second splicing ring 2412, the two ends of the first splicing ring 2411 and the two ends of the second splicing ring 2412 are detachably connected in a one-to-one correspondence. In this way, when the first sealing component 230 fails, the second sealing component 240 can be installed on one side of the first sealing component 230 as a sealing reinforcement structure to complete the sealing repair inside the hole.

[0079] In one possible implementation, a first connecting part 2411a is provided at both ends of the first splicing ring 2411, and a second connecting part 2412a is provided at both ends of the second splicing ring 2412. The two first connecting parts 2411a and the two second connecting parts 2412a are detachably connected in a one-to-one correspondence.

[0080] For example, the first connecting part 2411a and the second connecting part 2412a can be connected by screws or bolts.

[0081] For details, see Figures 4 to 6 As shown, the first connecting part 2411a and the second connecting part 2412a are connected by eight first screws 700.

[0082] See Figure 3 and Figure 7 As shown, the second sealing sleeve 241 is connected to the first sealing sleeve 231 by four second screws 800.

[0083] In this embodiment, in order to improve the positional accuracy of the first splicing ring 2411 and the second splicing ring 2412, at least one first positioning part 2411b is provided at both ends of the first splicing ring 2411, and at least one second positioning part 2412b is provided at both ends of the second splicing ring 2412, with at least two first positioning parts 2411b and at least two second positioning parts 2412b connected in a one-to-one correspondence.

[0084] For details, see Figure 4As shown, there are two first positioning parts 2411b and two second positioning parts 2412b. The two first positioning parts 2411b and the two second positioning parts 2412b are connected one-to-one by two positioning pins 900.

[0085] In one possible implementation, to facilitate the installation of the second seal 242, the inner wall of the second sealing sleeve 241 is provided with at least two mounting grooves 2413, each corresponding to one of the at least two second seals 242, with the second seals 242 located within the mounting grooves 2413. The mounting grooves 2413 can serve to position the second seals 242 during installation.

[0086] To facilitate grease injection, the second sealing sleeve 241 is provided with at least two grease injection holes 244, which are arranged opposite to each other and located between at least two mounting grooves 2413. The grease injection holes 244 are in communication with the second accommodating cavity.

[0087] Specifically, at least one of the two grease injection holes 244 is connected to the grease pump 400, and the other is connected to the return oil tank.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing device for a tunnel boring machine, characterized in that, The sealing device includes a grease injection assembly and a sealing assembly. The sealing assembly includes a sealing sleeve and at least two sealing elements. The at least two sealing elements are spaced apart and sleeved on the rotating shaft of the tunnel boring machine. The sealing sleeve is sleeved on the sealing elements. The inner wall of the sealing element abuts against the rotating shaft, and the outer wall of the sealing element abuts against the sealing sleeve. A receiving cavity is formed between the sealing sleeve and the rotating shaft. The receiving cavity is used to receive grease. The grease injection assembly includes a first detector, a second detector, a controller, and a regulating valve. The first detector, the second detector, and the regulating valve are all electrically connected to the controller. The regulating valve is in communication with the receiving cavity. The first detector is configured to detect the temperature of the soil chamber of the tunnel boring machine. The second detector is configured to detect the pressure of the soil chamber. The controller is configured to control the opening of the regulating valve according to the temperature and the pressure to change the flow rate of grease entering the receiving cavity.

2. The sealing device according to claim 1, characterized in that, When the temperature exceeds the maximum value of the first preset range, the controller is configured to control the regulating valve to increase its opening.

3. The sealing device according to claim 1, characterized in that, When the pressure is greater than the maximum value of the second preset range, the controller is configured to control the regulating valve to increase its opening.

4. The sealing device according to any one of claims 1 to 3, characterized in that, The controller includes a temperature controller, a pressure controller, a main controller, and a flow regulator, all of which are electrically connected to the main controller. The first detector is electrically connected to the temperature controller, the second detector is electrically connected to the pressure controller, and the regulating valve is electrically connected to the flow regulator.

5. The sealing device according to claim 4, characterized in that, The grease injection assembly also includes a flow transmitter, which is electrically connected to the main controller, communicates with the receiving cavity, and is located between the receiving cavity and the regulating valve. The flow transmitter is used to detect the flow rate of grease entering the receiving cavity.

6. The sealing device according to any one of claims 1 to 3, characterized in that, The sealing assembly includes a first sealing assembly and a second sealing assembly, the second sealing assembly being located on one side of the first sealing assembly along the axial direction of the rotation axis, and the second sealing assembly being connected to the first sealing assembly; The first sealing assembly includes a first sealing sleeve and at least two first sealing elements. The at least two first sealing elements are spaced apart and sleeved on the rotating shaft. The first sealing sleeve is sleeved on the first sealing elements. The inner wall of the first sealing element abuts against the rotating shaft, and the outer wall of the first sealing element abuts against the first sealing sleeve. A first receiving cavity is formed between the first sealing sleeve and the rotating shaft. The second sealing assembly includes a second sealing sleeve and at least two second sealing elements. The at least two second sealing elements are spaced apart and sleeved on the rotating shaft. The second sealing sleeve is sleeved on the second sealing elements. The inner wall of the second sealing element abuts against the rotating shaft, and the outer wall of the second sealing element abuts against the second sealing sleeve. A second receiving cavity is formed between at least two adjacent second sealing elements.

7. The sealing device according to claim 6, characterized in that, The second sealing sleeve includes a first splicing ring and a second splicing ring. The first splicing ring and the second splicing ring are arranged opposite to each other, and the two ends of the first splicing ring correspond one-to-one with the two ends of the second splicing ring and are detachably connected.

8. The sealing device according to claim 7, characterized in that, The first splicing ring has a first connecting part at both ends, and the second splicing ring has a second connecting part at both ends. The two first connecting parts and the two second connecting parts are detachably connected in a one-to-one correspondence.

9. The sealing device according to claim 7, characterized in that, The first splicing ring has at least one first positioning part at each end, and the second splicing ring has at least one second positioning part at each end, with at least two first positioning parts and at least two second positioning parts connected in a one-to-one correspondence.

10. The sealing device according to claim 6, characterized in that, The inner wall of the second sealing sleeve is provided with at least two mounting grooves, and the at least two mounting grooves are respectively provided with at least two second sealing elements, and the second sealing elements are located in the mounting grooves; The second sealing sleeve is provided with at least two grease injection holes, which are arranged opposite to each other and located between at least two mounting grooves. The grease injection holes communicate with the second accommodating cavity.

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