Dustproof oil seal and shield tunneling machine main drive sealing structure comprising same

Abstract

The utility model discloses a dustproof oil seal and a shield tunneling machine main drive sealing structure comprising the dustproof oil seal. The problems that in the prior art, a sealing system repairing technology is large in structure change, high in cost and long in time are solved. The dustproof oil seal comprises a sealing base and a V-shaped sealing dustproof lip portion which are integrally formed, the V-shaped sealing dustproof lip portion is connected to the lower portion of the sealing base through a sealing waist portion, and when the dustproof oil seal bears pressure, the V-shaped sealing dustproof lip portion forms triangular support. Through the structural design, the dustproof oil seal has the functions of external dust prevention and internal pressure bearing, and the effect of rapid leakage prevention is achieved. Compared with the prior art, the main drive sealing structure of the shield tunneling machine has the advantages that the sealing ring and the pressing ring on the outermost side are replaced, the sealing effect can be rapidly achieved, and meanwhile grease consumption is reduced in the using process; the sealing effect is achieved, and meanwhile the sealing replacement procedure and the working difficulty are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of main drive seals, in particular to a dustproof oil seal and a shield machine main drive seal structure comprising the dustproof oil seal. Background Art

[0002] The function of the shield machine main drive sealing system is to prevent external dust from entering the main bearing (external seal works) and to prevent the main bearing lubricating gear oil from leaking out from the main drive (internal seal works). When the inner seal fails due to long-term use, aging, and pressure deformation, but the outer seal has not failed, the outer seal needs to be removed before replacement, which greatly increases the workload and difficulty of the work. At this time, a quick solution to the oil leakage of the inner seal is needed.

[0003] In recent years, some related technologies have emerged for the repair of shield machine main drive seals, such as the quickly replaceable shield machine main drive seal structure disclosed in the Chinese patent application number 201610933360.6, which adds a lip seal on the basis of the original main drive structure of the shield machine to protect the original sealing system and can be quickly replaced after damage; and the shield machine main drive internal seal leakage plugging construction method disclosed in the Chinese patent application number 202211078274.3, which adjusts the relative position of the inner seal and the wear-resistant ring by lifting the bolt and adds a temporary seal in the gap of the adjusted wear-resistant ring to plug the leakage of the shield machine main drive seal. In the above two repair technologies, the sealing system structure is temporarily installed. Although the sealing effect is achieved to the outside world, it cannot effectively prevent the main bearing lubricating gear oil from leaking outward (i.e., the failure of the inner seal). If the inner seal is not replaced, only the outer seal needs to be replaced with a seal of a new structure, which can achieve the effect of blocking leakage, which will greatly save cost and time. Therefore, it is necessary to research and develop a dustproof oil seal structure that can prevent dust from the outside and bear pressure from the inside to improve the sealing effect of the main drive of the shield machine. Utility Model Content

[0004] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a dustproof oil seal and a shield machine main drive sealing structure comprising the dustproof oil seal, which solves the problem that the sealing system repair technology in the prior art requires large structural changes, high costs and long time.

[0005] The technical solution of the utility model is achieved as follows: a dustproof oil seal comprises an integrally formed sealing base and a V-shaped sealing dustproof lip, the V-shaped sealing dustproof lip is connected to the lower part of the sealing base through a sealing waist, and when the dustproof oil seal is under pressure, the V-shaped sealing dustproof lip forms a triangular support; the dustproof oil seal has the functions of external dustproof and internal pressure bearing through the above-mentioned structural design, thereby achieving a rapid leakage blocking effect.

[0006] Further preferably, the V-shaped sealing dustproof lip comprises a front dustproof lip and a rear sealing lip, and the inner surface of the rear sealing lip is connected to the inner surface of the front dustproof lip by an arc transition. In specific use, the front dustproof lip and the rear sealing lip will form a triangular support structure as a whole. With the support of the front dustproof lip at one end, the rear sealing lip is prevented from generating an excessively high contact load, especially when the rear sealing lip is under pressure, the effect is obvious.

[0007] Further preferably, the inner surface of the middle part of the rear sealing lip is provided with a pressure-bearing inflection point, and when the dustproof oil seal is under pressure, the rear sealing lip forms a local angle support. The outer surface of the rear sealing lip is an outwardly convex arc surface, the rear sealing lip is connected to the sealing waist by an arc transition, the sealing waist is connected to the bottom surface of the sealing base by an arc transition, and the front dustproof lip is connected to the front end surface of the sealing base by an arc transition.

[0008] A shield machine main drive sealing structure comprises the dustproof oil seal, a runway and an outer ring member. The dustproof oil seal is arranged in an annular cavity formed by the runway and the outer ring member and is fixed by a pressure ring.

[0009] Further preferably, a dustproof oil seal, a second seal, a third seal and a fourth seal are sequentially provided in the annular cavity from outside to inside, the rear sealing lip of the dustproof oil seal faces the second seal, the second seal and the third seal face oppositely, and the third seal and the fourth seal face the same direction.

[0010] Further preferably, a spacer ring is provided between two adjacent seals and between the second seal and the dustproof oil seal to limit and fix the seal and the dustproof oil seal, and a sealing ring is provided between the spacer ring and the outer ring to provide overall sealing.

[0011] Further preferably, the cross section of the pressure ring is T-shaped, and the portion of the pressure ring extending into the annular cavity is provided with an arcuate inner ring surface, which corresponds to the arc transition connection portion between the front dustproof lip and the front end surface of the sealing base. A sealing ring is provided between the portion of the pressure ring extending into the annular cavity and the outer ring.

[0012] Further preferably, the inner V-shaped surface of the V-shaped sealing dustproof lip of the dustproof oil seal is coated with grease.

[0013] The beneficial effects of the utility model are as follows: the utility model dustproof oil seal has a V-shaped sealing dustproof lip composed of a front dustproof lip and a rear sealing lip, so that the dustproof oil seal has the function of external dustproof and internal pressure bearing, further improving the sealing performance and extending the service life. Compared with the prior art, the shield machine main drive sealing structure replaces the outermost seal and pressure ring, which can quickly achieve the sealing effect, and also saves the consumption of grease during use; while meeting the sealing effect, the replacement process and difficulty of the seal are greatly reduced, and the contact state of the sealing lip and the runway is basically the same as the new seal of the original structure. The seal wear and heat under pressure conditions are significantly reduced compared with the previous structure, which greatly extends the service life of the dustproof oil seal and solves the problems of large structural changes, high cost and long time in the existing sealing system repair technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a schematic diagram of the structure of the dustproof oil seal of the utility model.

[0016] Figure 2 It is a partial enlarged view of the rear sealing lip of the dustproof oil seal of the utility model.

[0017] Figure 3 This is a schematic diagram of the main drive sealing structure of the shield machine of the utility model.

[0018] Figure 4 This is a schematic diagram before the dustproof oil seal is installed.

[0019] Figure 5 This is a schematic diagram of the dustproof oil seal under pressure.

[0020] In the figure: 1 dustproof oil seal, 1-1 sealing base, 1-2 rear sealing lip, 1-3 front dustproof lip, 1-4 sealing waist, 1-5 pressure inflection point; 2 second seal, 3 third seal, 4 fourth seal, 5 spacer ring, 6 pressure ring, 7 outer ring, 8 runway, 9 sealing ring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be understood that the terms "vertical", "lateral", "up", "down", "front", "back", "left", "right", "horizontal", "top", "bottom", "inside" and "outside" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0024] like Figure 1 As shown, in embodiment 1, a dustproof oil seal comprises an integrally formed sealing base 1-1 and a V-shaped sealing dustproof lip, the V-shaped sealing dustproof lip is connected to the lower part of the sealing base 1-1 through a sealing waist 1-4, and the size of the connection between the sealing base and the sealing waist in this embodiment is thickened to make up for the lack of radial compression. Specifically, the V-shaped sealing dustproof lip comprises a front dustproof lip 1-3 and a rear sealing lip 1-2, the inner surface of the rear sealing lip 1-2 is connected to the inner surface of the front dustproof lip 1-3 by a circular arc transition; the rear sealing lip 1-2 has the effect of sealing the main bearing lubricating gear oil; the front dustproof lip 1-3 has the effect of preventing external dust from entering.

[0025] When the dustproof oil seal is under pressure, the V-shaped dustproof lip, i.e. the front dustproof lip 1-3 and the rear sealing lip 1-2, form a triangular support. If the rear sealing lip 1-2 is too long or too thick, it will interfere with the spacer ring, and if it is too short, the pressure resistance will deteriorate. While reducing the length and thickness of the sealing lip, the back of the sealing lip is made into a triangular support structure, which will support the lip when under pressure, avoid excessive contact load on the lip, improve the sealing effect of the dustproof oil seal and extend its service life.

[0026] As a preferred solution, Figure 2 As shown, in this embodiment, the inner surface of the middle part of the rear sealing lip 1-2 is provided with a pressure-bearing inflection point 1-5. When the dustproof oil seal is under pressure, the rear sealing lip 1-2 forms a local angle support to improve the pressure-bearing capacity of the rear sealing lip. In addition, as a preferred embodiment, the outer surface of the rear sealing lip 1-2 is an outwardly convex arc surface, also to improve the pressure-bearing capacity of the lip. The rear sealing lip 1-2 is connected to the sealing waist 1-4 by an arc transition, the sealing waist 1-4 is connected to the bottom surface of the sealing base 1-1 by an arc transition, and the front dustproof lip 1-3 is connected to the front end surface of the sealing base 1-1 by an arc transition. The overall design of arc transition improves the sealing and pressure-bearing capacity of the dustproof oil seal.

[0027] Example 2: Figure 3 As shown, a shield machine main drive sealing structure includes the dustproof oil seal 1 described in Example 1 and also includes a runway 8 and an outer ring 7. The dustproof oil seal 1 is arranged in the annular cavity formed by the runway 8 and the outer ring 7, and is fixed by a pressure ring 6. The sealing base and the sealing groove are interference fit, and the pressure ring 6 can adopt a dustproof oil seal pressure ring. The dustproof oil seal 1 can replace the outermost seal of the original main drive sealing structure. In order to further improve the pressure bearing capacity of the seal, the supporting effect of the wall surface of the dustproof oil seal pressure ring is utilized. When the seal is under pressure, the sealing waist will be close to the wall surface of the dustproof oil seal pressure ring, which indirectly improves the pressure bearing capacity of the dustproof oil seal. After the dustproof oil seal is installed, the contact state of the lip and the runway and the sealing force are basically the same as the original seal. Under pressure, the contact force between the sealing lip and the runway is less than that of the original seal, which is conducive to extending the service life.

[0028] In order to adapt to the existing shield machine main drive structure, the dustproof oil seal is limited by its assembly space, the radial assembly size cannot be changed, and the length of the rear sealing lip 1-2 is reduced to a certain extent. In order to ensure its sealing effect (the contact load between the lip and the runway is basically the same as the original seal), it is adjusted together in three ways: first, the size of the connection between the sealing base 1-1 and the sealing waist 1-4 is thickened to make up for the lack of radial compression; second, when the dustproof oil seal is assembled, the rear sealing lip 1-2 will be close to the runway by the torsional effect of the sealing waist 4; third, the front dustproof lip 1-3 and the rear sealing lip 1-2 will form a similar triangular support structure as a whole. With the support of the front dustproof lip 1-3 at one end, the rear sealing lip 1-2 is prevented from generating excessive contact load, especially when the rear sealing lip 1-2 is under pressure, the effect is obvious.

[0029] Embodiment 3: A shield machine main drive sealing structure. On the basis of embodiment 2, a dustproof oil seal 1, a second seal 2, a third seal 3, and a fourth seal 4 are sequentially arranged in the annular cavity from outside to inside. The rear sealing lip 1-2 of the dustproof oil seal 1 faces the second seal 2, the second seal 2 and the third seal 3 face opposite directions, and the third seal 3 and the fourth seal 4 face the same direction. The dustproof oil seal 1 replaces the outermost seal of the original main drive sealing structure, and has the function of external dustproof and internal pressure bearing. Spacer rings 5 ​​are arranged between two adjacent seals and between the second seal 2 and the dustproof oil seal 1, which are used to limit and fix the seal and the dustproof oil seal. A sealing ring 9 is arranged between the spacer ring 5 and the outer ring 7 to further improve the overall sealing performance.

[0030] As a preferred solution, the cross section of the pressure ring 6 is T-shaped, and the portion of the pressure ring 6 extending into the annular cavity is provided with an arc-shaped inner ring surface, which corresponds to the arc transition connection portion between the front dustproof lip 1-3 and the front end surface of the sealing base 1-1; that is, when the seal is under pressure, the back of the sealing waist will be close to the wall surface of the dustproof oil seal pressure ring 6, which indirectly improves the pressure bearing capacity of the dustproof oil seal. A sealing ring 9 is provided between the portion of the pressure ring 6 extending into the annular cavity and the outer ring 7 to improve the overall sealing performance.

[0031] As a preferred solution, Figure 4 , 5 As shown, the inner V-shaped surface of the V-shaped sealing dustproof lip of the dustproof oil seal 1 is coated with lubricating grease 10. Under pressure, the lubricating grease is sealed in the triangular support, further improving the pressure bearing capacity of the lip.

[0032] The application of this dustproof oil seal in the main drive sealing system of the shield machine is as follows:

[0033] Step 1: When the inner seal (third seal, fourth seal) fails, remove the original pressure ring, replace the outermost seal with the dustproof oil seal 1, and pre-apply grease to the area between the front dustproof lip 1-3 and the rear sealing lip 1-2 (i.e., the inner V-shaped surface of the V-shaped seal dustproof lip), and then reinstall the dustproof oil seal pressure ring.

[0034] Step 2: After the dustproof oil seal 1 is installed, the grease in the sealing cavity composed of the dustproof oil seal 1 and the second seal 2 will no longer be squeezed out to the outside, and it is capable of bearing the pressure from the main bearing side.

[0035] Step 3: Due to the special design of the dustproof oil seal structure, its operating conditions are consistent with the original seal, and the shield machine's excavation speed will not be reduced due to differences in the sealing structure.

[0036] In the above process, the original sealing ring is replaced with a dustproof oil seal ring, the sealing lip faces inward to seal the main bearing lubricating gear oil; the dustproof lip is used to block external dust; the sealing waist connects the rear sealing lip and the front dustproof lip together to support them. At the same time, the grease in the chamber between the dustproof oil seal and the second seal is no longer squeezed out, saving grease consumption.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dustproof oil seal, characterized in that: It comprises an integrally formed sealing base (1-1) and a V-shaped sealing dustproof lip, wherein the V-shaped sealing dustproof lip is connected to the lower part of the sealing base (1-1) via a sealing waist (1-4), and when the dustproof oil seal is under pressure, the V-shaped sealing dustproof lip forms a triangular support.

2. The dustproof oil seal according to claim 1, characterized in that: The V-shaped sealing dustproof lip comprises a front dustproof lip (1-3) and a rear sealing lip (1-2), and the inner surface of the rear sealing lip (1-2) is connected to the inner surface of the front dustproof lip (1-3) in a circular arc transition.

3. The dustproof oil seal according to claim 2, characterized in that: A pressure-bearing inflection point (1-5) is provided on the inner surface of the middle portion of the rear sealing lip (1-2); when the dustproof oil seal is under pressure, the rear sealing lip (1-2) forms a local angle support.

4. The dustproof oil seal according to claim 2 or 3, characterized in that: The outer surface of the rear sealing lip (1-2) is an outwardly convex arc-shaped surface; the rear sealing lip (1-2) is connected to the sealing waist (1-4) by an arc transition; the sealing waist (1-4) is connected to the bottom surface of the sealing base (1-1) by an arc transition; and the front dustproof lip (1-3) is connected to the front end surface of the sealing base (1-1) by an arc transition.

5. A shield machine main drive sealing structure, characterized in that: The dustproof oil seal (1), the raceway (8) and the outer ring (7) as claimed in any one of claims 2 to 4, wherein the dustproof oil seal (1) is arranged in an annular cavity formed by the raceway (8) and the outer ring (7) and is fixed by a pressure ring (6).

6. The shield machine main drive sealing structure according to claim 5, characterized in that: The annular cavity is provided with a dustproof oil seal (1), a second seal (2), a third seal (3), and a fourth seal (4) in sequence from outside to inside. The rear sealing lip (1-2) of the dustproof oil seal (1) faces the second seal (2), the second seal (2) and the third seal (3) face opposite directions, and the third seal (3) and the fourth seal (4) face the same direction.

7. The shield machine main drive sealing structure according to claim 6, characterized in that: A spacer ring (5) is provided between two adjacent seals and between the second seal (2) and the dustproof oil seal (1), and a sealing ring (9) is provided between the spacer ring (5) and the outer ring member (7).

8. The shield machine main drive sealing structure according to any one of claims 5 to 7, characterized in that: The cross section of the pressure ring (6) is T-shaped, and the portion of the pressure ring (6) extending into the annular cavity is provided with an arc-shaped inner ring surface, which corresponds to the arc transition connection portion between the front dustproof lip (1-3) and the front end surface of the sealing base (1-1).

9. The shield machine main drive sealing structure according to claim 8, characterized in that: A sealing ring (9) is provided between the portion of the pressure ring (6) extending into the annular cavity and the outer ring member (7).

10. The shield machine main drive sealing structure according to claim 5 or 9, characterized in that: The inner V-shaped surface of the V-shaped sealing dustproof lip of the dustproof oil seal (1) is coated with lubricating grease (10).

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