Shield tunneling machine main drive sealing element and shield tunneling machine

Abstract

The utility model discloses a main drive sealing element of a shield tunneling machine and the shield tunneling machine. The main drive sealing element of the shield tunneling machine comprises a first sealing assembly, a second sealing assembly and a connecting assembly, the first sealing assembly and the second sealing assembly are connected to the connecting assembly and form a sealing groove, the first sealing assembly is provided with a first contact part and a second contact part, the second sealing assembly is provided with a third contact part and a fourth contact part, and the third contact part and the fourth contact part are arranged in the sealing groove. The connecting assembly is provided with a fifth contact part, the upper end of the fourth contact part is provided with a lubrication holding part, the lubrication holding part comprises at least one protruding structure, and a holding groove is formed between the protruding structure and the fourth contact part. A better sealing effect is achieved by arranging a plurality of contact parts, the shape of the contact parts is matched with that of the shield tunneling machine, the lubrication containing part is arranged, the containing groove is formed, lubricating oil can be stored in the containing groove, loss of the lubricating oil is reduced, the sealing piece is continuously lubricated, the sealing effect of the sealing piece is improved, and the service life of the sealing piece is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field related to seals, and in particular to a main drive seal of a shield machine and a shield machine. Background Art

[0002] my country's infrastructure construction is undergoing rapid development. However, given the country's mountainous terrain, tunnel excavation is often necessary to facilitate railway and highway construction. Shield machines are essential for tunnel excavation. The shield machine's main drive seal is a key component essential for its normal operation. After installation, the shield machine's main drive seal requires lubrication to improve sealing effectiveness and service life. However, lubricating oil on the shield machine's main drive seal can be lost over time, resulting in poor lubrication and impacting sealing effectiveness and service life. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a shield machine main drive seal that can reduce lubricating oil loss in the shield machine main drive seal and improve the sealing effect and service life of the shield machine main drive seal.

[0004] The present application also proposes a shield machine having the above-mentioned shield machine main drive seal.

[0005] According to the first aspect of the present application, a shield machine main drive seal comprises:

[0006] a first sealing assembly having an annular structure, a first contact portion being provided on an inner side of the first sealing assembly, and a second contact portion being provided on an outer side of the first sealing assembly;

[0007] a second sealing assembly, wherein the second sealing assembly is an annular structure, a third contact portion is provided on an inner side of the second sealing assembly, and a fourth contact portion is provided on an outer side of the second sealing assembly;

[0008] a connecting assembly, one end of the first sealing assembly being connected to the connecting assembly, one end of the second sealing assembly being connected to the connecting assembly, the first sealing assembly and the second sealing assembly extending from the connecting assembly in two directions respectively, a sealing groove being formed between the first sealing assembly and the second sealing assembly, and a fifth contact portion being provided on the connecting assembly;

[0009] A lubrication retention portion is arranged at the upper end of the fourth contact portion, and the lubrication retention portion includes at least one protrusion structure, which is an annular protrusion arranged around the second sealing assembly. The protrusion structure protrudes obliquely upward, and a retention groove is formed between the protrusion structure and the fourth contact portion.

[0010] The shield machine main drive seal according to the embodiment of the present application has at least the following beneficial effects:

[0011] By setting the first sealing component, the second sealing component, the connecting component and the sealing groove, the first sealing component and the second sealing component are both annular structures, which match the parts that need to be sealed on the main drive of the shield machine, and the sealing effect is better; by setting the first contact part, the second contact part, the third contact part, the fourth contact part and the fifth contact part, multiple contact parts are in close contact with multiple parts on the main drive of the shield machine, thereby achieving a better sealing effect; by setting the lubricating retention part, the lubricating oil can be retained and the loss of lubricating oil can be reduced. The lubricating retention part is set at the upper end of the fourth contact part, and the setting position is more reasonable, which can achieve a better lubrication effect; the lubricating retention part is set as a convex structure, and a retention groove is formed between the convex structure and the fourth contact part. The retention groove can effectively store lubricating oil. When the main drive of the shield machine moves, the lubricating oil in the retention groove will flow. If the lubricating oil in the fourth contact part is consumed too much at this time, resulting in the loss of oil film and poor sealing effect, the lubricating oil in the retention groove will flow downward to replenish the oil film to achieve better sealing and lubrication effects, reduce the friction damage of the shield machine main drive seal, and improve the service life of the shield machine main drive seal; if the oil film of the fourth contact part is complete at this time, the presence of the oil film can prevent the lubricating oil in the retention groove from flowing downward, so that the retention groove has a better storage effect, thereby being able to continuously provide lubrication for the shield machine main drive seal, thereby improving the sealing effect and service life of the shield machine main drive seal.

[0012] According to some embodiments of the present application, there are at least three protruding structures, and the plurality of protruding structures form a corrugated structure.

[0013] According to some embodiments of the present application, the end of the protruding structure is a round head structure.

[0014] According to some embodiments of the present application, the first contact portion is parallel to the axis of the first sealing assembly, the second contact portion has an angle with the axis of the first sealing assembly, and the distance between the upper end of the second contact portion and the axis of the first sealing assembly is smaller than the distance between the lower end of the second contact portion and the axis of the first sealing assembly.

[0015] According to some embodiments of the present application, a sixth contact portion is provided at an upper end of the second contact portion, and the sixth contact portion is parallel to the axis of the first sealing assembly.

[0016] According to some embodiments of the present application, a horizontal contact portion is provided at the top of the first sealing assembly, and a first inclined contact portion is provided at the top of the second sealing assembly.

[0017] According to some embodiments of the present application, a second inclined contact portion is provided between the first inclined contact portion and the third contact portion.

[0018] According to some embodiments of the present application, a third inclined contact portion is provided between the first inclined contact portion and the fourth contact portion, and the third inclined contact portion is provided as a parting surface.

[0019] According to some embodiments of the present application, a fourth inclined contact portion is provided on the connecting assembly, the fourth inclined contact portion is inclined relative to the axis of the first sealing assembly, and the distance between the lower end of the fourth inclined contact portion and the axis of the first sealing assembly is smaller than the distance between the upper end of the fourth inclined contact portion and the axis of the first sealing assembly; a second arc transition portion is provided between the fourth inclined contact portion and the fourth contact portion.

[0020] A shield machine according to an embodiment of the second aspect of the present application includes the shield machine main drive seal described in the above embodiment.

[0021] A shield machine according to an embodiment of the present application has at least the following beneficial effects:

[0022] The shield machine main drive seal in the above embodiment is adopted. The shield machine main drive seal is provided with a first sealing component, a second sealing component, a connecting component and a sealing groove. The first sealing component and the second sealing component are both annular structures, which match the parts of the shield machine main drive that need to be sealed, and the sealing effect is better; by providing a first contact part, a second contact part, a third contact part, a fourth contact part and a fifth contact part, multiple contact parts are in close contact with multiple parts on the shield machine main drive, thereby achieving a better sealing effect; by providing a lubrication retention part, the lubricating oil can be retained and the loss of lubricating oil can be reduced. The lubrication retention part is provided at the upper end of the fourth contact part, and the setting position is more reasonable, which can achieve a better lubrication effect; the lubrication retention part is provided as a convex structure, and a convex structure is formed between the convex structure and the fourth contact part. There is a retention groove, which can effectively store lubricating oil. When the main drive of the shield machine moves, the lubricating oil in the retention groove will flow. If the lubricating oil in the fourth contact part is consumed too much at this time, resulting in the loss of oil film and poor sealing effect, the lubricating oil in the retention groove will flow downward to replenish the oil film to achieve better sealing and lubrication effects, reduce the friction damage of the main drive seal of the shield machine, and increase the service life of the main drive seal of the shield machine; if the oil film of the fourth contact part is complete at this time, the presence of the oil film can prevent the lubricating oil in the retention groove from flowing downward, so that the retention groove has a better storage effect, so that it can continuously provide lubrication for the main drive seal of the shield machine, thereby improving the sealing effect of the main drive seal of the shield machine and increasing the service life of the main drive seal of the shield machine and the shield machine.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the technical solution disclosed in this application and constitute a part of the specification. Together with the embodiments disclosed in this application, they are used to explain the technical solution disclosed in this application and do not constitute a limitation on the technical solution disclosed in this application.

[0025] Figure 1 This is a schematic diagram of the overall structure of the main drive seal of the shield machine according to the embodiment of the present application;

[0026] Figure 2 This is a schematic cross-sectional structure diagram of the main drive seal of a shield machine according to an embodiment of the present application;

[0027] Figure 3 This is a schematic diagram of the inclination angles of the contact parts of the main drive seal of the shield machine in an embodiment of the present application.

[0028] Figure markings: shield machine main drive seal 100; first sealing assembly 110; first contact portion 111; second contact portion 112; sixth contact portion 113; horizontal contact portion 114; chamfer 115; second sealing assembly 120; third contact portion 121; fourth contact portion 122; first inclined contact portion 123; second inclined contact portion 124; third inclined contact portion 125; connecting assembly 130; fifth contact portion 131; fourth inclined contact portion 132; second circular arc transition portion 133; sealing groove 140; first circular arc transition portion 141; lubrication retention portion 150; protruding structure 151; retention groove 152. DETAILED DESCRIPTION

[0029] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0030] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0031] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0032] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0033] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0034] like Figure 1 、 2As shown, the embodiment of the present application discloses a shield machine main drive seal 100, which is used for sealing the shield machine main drive. The shield machine main drive seal 100 includes a first sealing component 110, a second sealing component 120 and a connecting component 130. One end of the first sealing component 110 is connected to the connecting component 130, and one end of the second sealing component 120 is connected to the connecting component 130. The first sealing component 110 and the second sealing component 120 extend from the connecting component 130 in two directions respectively. A sealing groove 140 is formed between the first sealing component 110 and the second sealing component 120, and a fifth contact portion is provided at the bottom of the connecting component; by setting the first sealing component 110 , the second sealing component 120, the connecting component 130 and the sealing groove 140, so that the overall shape of the shield machine main drive seal 100 is adapted to the parts that need to be sealed in the shield machine main drive, and the sealing effect is better; the first sealing component 110 is an annular structure, adapted to the parts that need to be sealed in the shield machine main drive, the first sealing component 110 is provided with a first contact portion 111 on the inside, and the second sealing component 110 is provided with a second contact portion 112 on the outside; the second sealing component 120 is an annular structure, adapted to the parts that need to be sealed in the shield machine main drive, the connecting component 130 is an annular structure, adapted to the parts that need to be sealed in the shield machine main drive, and the third contact portion 112 is provided on the inside of the second sealing component 120 121, a fourth contact portion 122 is provided on the outer side of the second sealing component 120; by providing the first contact portion 111 and the second contact portion 112 on the first sealing component 110, providing the third contact portion 121 and the fourth contact portion 122 on the second sealing component 120, and providing the fifth contact portion 131 on the connecting component 130, multiple contact portions are in close contact with multiple parts of the components that need to be sealed on the main drive of the shield machine, thereby achieving a better sealing effect; a lubrication retention portion 150 is provided on the upper end of the fourth contact portion 122 to prevent the lubricating oil from losing too quickly. Since the fourth contact portion 122 is located at the outermost circle of the shield machine main drive seal 100, its contact area with the shield machine main drive is large, and the shield machine The axial force applied to the main engine during driving motion is also relatively large, so the fourth contact portion 122 requires more lubricating oil, and the lubricating oil at the fourth contact portion 122 is consumed faster. Setting the lubrication retention portion 150 at the fourth contact portion 122 can achieve a better lubrication effect; setting the lubrication retention portion 150 at the upper end of the fourth contact portion 122 facilitates the downward flow of the lubricating oil to achieve a better lubrication effect; the lubrication retention portion 150 includes at least one protrusion structure 151, which is an annular protrusion arranged around the second sealing assembly 120, and the protrusion structure 151 protrudes obliquely upward, and a retention groove 152 is formed between the protrusion structure 151 and the fourth contact portion 122.

[0035] It is worth noting that in the above description, "upper oblique" and "bottom" are based on Figure 2 The orientation shown is when the fifth contact portion is located at the bottom of the shield machine's main drive and is horizontally positioned. In the description of this application, "inside," "outside," "inner side," and "outer side" are all relative positions relative to the axis of the first sealing assembly. The position closer to the axis of the first sealing assembly is considered the inner side, and the position farther from the axis of the first sealing assembly is considered the outer side.

[0036] The shield machine main drive seal 100 needs to be lubricated when in use. The lubricating oil will form an oil film between the shield machine main drive seal 100 and the shield machine main drive to achieve a better sealing effect. At the same time, the lubricating oil will reduce the friction damage between the shield machine main drive seal 100 and the shield machine main drive, thereby increasing the service life of the shield machine main drive seal 100. However, in actual use, the lubricating oil is lost very quickly, which will cause the oil film between the shield machine main drive seal 100 and the shield machine main drive to disappear, affecting the lubrication effect and service life. For this reason, the embodiment of the present application provides a retention groove 152 for storing lubricating oil, reducing the loss of lubricating oil, and improving the sealing effect and service life of the shield machine main drive seal 100. The protruding structure 151 is set to be annular and protrudes obliquely upward, so that the retention groove 152 formed has a better storage effect.

[0037] Specifically, in the embodiment of the present application, the sealing groove 140 is a V-shaped structure, and a first arc transition portion 141 is provided at the bottom of the sealing groove 140. The sealing groove 140 is set as a V-shaped structure, which is adapted to the shape of the part to be sealed of the main drive of the shield machine, and the fitting effect is better, thereby achieving a better sealing effect. The first arc transition portion 141 is provided at the bottom of the sealing groove 140 to avoid stress concentration, avoid the breakage of the second sealing component 120, and improve the service life of the main drive seal 100 of the shield machine.

[0038] In the embodiment of the present application, at least three protrusions 151 are provided, and the plurality of protrusions 151 form a corrugated structure. This corrugated structure can enhance the friction between the fourth contact portion 122 and the shield machine's main drive, achieving a better sealing effect. Furthermore, the provision of the plurality of protrusions 151 can form a plurality of retention grooves 152 on the fourth contact portion 122, achieving a better lubricating oil storage effect.

[0039] In the embodiment of the present application, the end of the raised structure has a rounded head structure. The sealing effect of the shield machine main drive seal 100 is related to the static friction between the fourth contact portion 122 and the shield machine main drive after installation. The greater the static friction, the tighter the installation and the better the sealing effect. Setting the end of the raised structure 151 to a rounded head structure changes the surface contact between the raised structure 151 and the shield machine main drive to line contact. Under the condition that the pressure of the raised structure 151 on the shield machine main drive remains unchanged, the reduced contact area between the raised structure 151 and the shield machine main drive will enhance its static friction, thereby enhancing the sealing effect. Providing multiple raised structures 151 can achieve better sealing effect.

[0040] In the embodiment of the present application, the first contact portion 111 is parallel to the axis of the first sealing component 110, the second contact portion 112 has an angle with the axis of the first sealing component 110, and the distance between the upper end of the second contact portion 112 and the axis of the first sealing component 110 is smaller than the distance between the lower end of the second contact portion 112 and the axis of the first sealing component 110.

[0041] By setting an angle between the second contact portion 112 and the axis of the first sealing component 110, the demolding difficulty of the shield machine main drive seal can be reduced during molding, thereby improving production efficiency. At the same time, since the shield machine main drive seal and the shield machine main drive are interference-fitted, the second contact portion 112 is set to an inclined structure with an angle to the axis of the first sealing component 110, which can reduce the difficulty of installation. In some embodiments of the present application, the angle between the second contact portion 112 and the axis of the first sealing component 110 is 3° to 8°. In one embodiment of the present application, please refer to Figure 3 The angle between the second contact portion 112 and the axis of the first sealing component 110 is 5°. In actual production and use, if the angle between the second contact portion 112 and the axis of the first sealing component 110 is too large, it will affect the sealing effect of the shield machine main drive seal 100. If the angle between the second contact portion 112 and the axis of the first sealing component 110 is too small, it will make it difficult to demold and the production efficiency is low. After repeated experiments, the applicant confirmed that the angle between the second contact portion 112 and the axis of the first sealing component 110 is set to 5° as a more appropriate angle.

[0042] In the embodiment of the present application, a sixth contact portion 113 is provided at the upper end of the second contact portion 112 . The sixth contact portion 113 is parallel to the axis of the first sealing assembly 110 , that is, the sixth contact portion 113 is a vertical structure.

[0043] By providing a sixth contact portion 113 parallel to the axis of the first sealing assembly 110 at the upper end of the second contact portion 112, and since the second contact portion 112 is an inclined structure and the sixth contact portion 113 is a vertical structure, and there is an interference fit between the shield machine main drive seal 100 and the shield machine main drive, after the shield machine main drive seal 100 is installed, the sixth contact portion 113 will exert a radial force on the shield machine main drive, preventing the shield machine main drive seal 100 from axial movement, reducing the requirements for the product's inner diameter interference fit, and improving the product's operational stability. The above-mentioned radial and axial directions are relative to the annular structure of the shield machine main drive seal 100.

[0044] In the embodiment of the present application, a horizontal contact portion 114 is provided at the top of the first sealing assembly 110, and a first inclined contact portion 123 is provided at the top of the second sealing assembly 120. By providing the horizontal contact portion 114 and the first inclined contact portion 123, the shape of the shield machine's main drive is adapted, and each contact portion has a closer contact with the shield machine's main drive, thereby improving the sealing effect.

[0045] In the embodiment of the present application, a chamfer 115 is provided between the first contact portion 111 and the horizontal contact portion 114. The chamfer 115 is provided to facilitate installation.

[0046] In the embodiment of the present application, a second inclined contact portion 124 is provided between the first inclined contact portion 123 and the third contact portion 121. By providing the second inclined contact portion 123, which is adapted to the shape of the shield machine main drive, each contact portion is in closer contact with the shield machine main drive, and the sealing effect is better.

[0047] In the embodiment of the present application, a third inclined contact portion 125 is provided between the first inclined contact portion 123 and the fourth contact portion 122. The third inclined contact portion 125 is provided as a parting surface. The angle between the third inclined contact portion 121 and the axis of the connecting assembly 130 is smaller than the angle between the first inclined contact portion 123 and the axis of the connecting assembly 130. By providing the third inclined contact portion 121, which is adapted to the shape of the shield machine main drive, each contact portion is in closer contact with the shield machine main drive, and the sealing effect is better. The position of the third inclined contact portion 121 is relatively far away from the sealing groove 140. Setting the third inclined contact portion 121 as a parting surface can reduce the risk of defects in compression molding, improve the appearance quality, and ensure the fine structure molding of large-section seals.

[0048] In an embodiment of the present application, a fourth inclined contact portion 132 is provided on the connecting assembly 130. The fourth inclined contact portion 132 is inclined relative to the axis of the first sealing assembly 110, and the distance between the lower end of the fourth inclined contact portion 132 and the axis of the first sealing assembly 110 is smaller than the distance between the upper end of the fourth inclined contact portion 132 and the axis of the first sealing assembly 110; a second arc transition portion 133 is provided between the fourth inclined contact portion 132 and the fourth contact portion 122. By providing the fourth inclined contact portion 132 and the second arc transition portion 133, the shape of the shield machine main drive is adapted, and the contact between each contact portion and the shield machine main drive is tighter, resulting in a better sealing effect. By providing the second arc transition portion 133, stress concentration is avoided, product breakage is prevented, and product strength is improved. In some embodiments, the inclination angle of the fourth inclined contact portion 132 is 5°.

[0049] An embodiment of the present application further discloses a shield machine, which includes the shield machine main drive seal of the above embodiment.

[0050] The shield machine of the embodiment of the present application adopts the shield machine main drive seal 100 in the above embodiment. The shield machine main drive seal 100 is provided with a first sealing component 110, a second sealing component 120, a connecting component 130 and a sealing groove 140. The first sealing component 110, the second sealing component 120, the connecting component 130 and the sealing groove 140 are all annular structures, which match the components that need to be sealed in the shield machine main drive, and the sealing effect is better; by providing a first contact portion 111, a second contact portion 112, a third contact portion 121, a fourth contact portion 122 and a fifth contact portion 131, multiple contact portions are in close contact with multiple parts on the shield machine main drive, thereby achieving a better sealing effect; by providing a lubrication retention portion 150, the lubricating oil can be retained and the loss of lubricating oil can be reduced. The lubrication retention portion 150 is provided at the upper end of the fourth contact portion 122. The setting position is relatively reasonable and can achieve a better lubrication effect; the lubrication retention portion 150 is provided as a convex structure 1 51. A retention groove 152 is formed between the protruding structure 151 and the fourth contact portion 122. The retention groove 152 can effectively store lubricating oil. When the main drive of the shield machine moves, the lubricating oil in the retention groove 152 will flow. If the lubricating oil in the fourth contact portion 122 is consumed too much at this time, resulting in a loss of oil film and poor sealing effect, the lubricating oil in the retention groove 152 will flow downward to replenish the oil film to achieve better sealing and lubrication effects, reduce friction damage to the shield machine main drive seal 100, and increase the service life of the shield machine main drive seal 100; if the oil film of the fourth contact portion 122 is complete at this time, the presence of the oil film can prevent the lubricating oil in the retention groove 152 from flowing downward, so that the retention groove 152 has a better storage effect, thereby being able to continuously provide lubrication for the shield machine main drive seal 100, thereby improving the sealing effect of the shield machine main drive seal 100 and increasing the service life of the shield machine main drive seal 100 and the shield machine.

[0051] In some optional embodiments, the functions / operations mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the functions / operations involved, the two boxes shown in succession may actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiments presented and described in the flow chart of the present application are provided in an exemplary manner for the purpose of providing a more comprehensive understanding of the technology. The disclosed method is not limited to the operations and logic flows presented herein. Optional embodiments are contemplated in which the order of the various operations is changed and the sub-operations described as a part of a larger operation are performed independently.

[0052] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. The shield machine main drive seal is characterized by: include: a first sealing assembly having an annular structure, a first contact portion being provided on an inner side of the first sealing assembly, and a second contact portion being provided on an outer side of the first sealing assembly; a second sealing assembly, wherein the second sealing assembly is an annular structure, a third contact portion is provided on an inner side of the second sealing assembly, and a fourth contact portion is provided on an outer side of the second sealing assembly; a connecting assembly, one end of the first sealing assembly being connected to the connecting assembly, one end of the second sealing assembly being connected to the connecting assembly, the first sealing assembly and the second sealing assembly extending from the connecting assembly in two directions respectively, a sealing groove being formed between the first sealing assembly and the second sealing assembly, and a fifth contact portion being provided on the connecting assembly; A lubrication retention portion is arranged at the upper end of the fourth contact portion, and the lubrication retention portion includes at least one protrusion structure, which is an annular protrusion arranged around the second sealing assembly. The protrusion structure protrudes obliquely upward, and a retention groove is formed between the protrusion structure and the fourth contact portion.

2. The shield machine main drive seal according to claim 1, characterized in that: There are at least three protruding structures, and the plurality of protruding structures form a corrugated structure.

3. The shield machine main drive seal according to claim 1, characterized in that: The end of the protruding structure is a round head structure.

4. The shield machine main drive seal according to claim 1, characterized in that: The first contact portion is parallel to the axis of the first sealing assembly, the second contact portion has an angle with the axis of the first sealing assembly, and the distance between the upper end of the second contact portion and the axis of the first sealing assembly is smaller than the distance between the lower end of the second contact portion and the axis of the first sealing assembly.

5. The shield machine main drive seal according to claim 4, characterized in that: A sixth contact portion is provided at an upper end of the second contact portion, and the sixth contact portion is parallel to the axis of the first sealing assembly.

6. The shield machine main drive seal according to claim 1, characterized in that: A horizontal contact portion is provided on the top of the first sealing assembly, and a first inclined contact portion is provided on the top of the second sealing assembly.

7. The shield machine main drive seal according to claim 6, characterized in that: A second inclined contact portion is provided between the first inclined contact portion and the third contact portion.

8. The shield machine main drive seal according to claim 6, characterized in that: A third inclined contact portion is provided between the first inclined contact portion and the fourth contact portion, and the third inclined contact portion is provided as a parting surface.

9. The shield machine main drive seal according to claim 1, characterized in that: A fourth inclined contact portion is provided on the connecting assembly, and the fourth inclined contact portion is inclined relative to the axis of the first sealing assembly. A second arc transition portion is provided between the fourth inclined contact portion and the fourth contact portion.

10. A shield machine, characterized in that: The shield machine main drive seal comprises the shield machine main drive seal according to any one of claims 1 to 9.

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