Shield tunneling machine with sealing ring of composite structure

Abstract

The utility model discloses a shield tunneling machine with a sealing ring with a composite structure, which belongs to the technical field of shield tunneling machine sealing, solves the problem of sealing failure caused by over-limit abrasion of the sealing ring in the prior art, and comprises a shield tunneling machine driving device and a soil bin, a plurality of composite structure sealing rings are fixedly arranged in the cavity, a plurality of tooth openings are formed in the bottoms of the composite structure sealing rings, the sizes of the tooth openings are sequentially decreased, and the size of the tooth opening close to the soil bin is the largest, so that the sealing rings can be continuously used after being abraded, the service life of the sealing rings is prolonged, impurities are prevented from entering the subsequent sealing rings, and the service life of the sealing rings is prolonged. Therefore, the service life of the whole main drive is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield machine sealing, and in particular relates to a shield machine with a composite structure sealing ring. Background Art

[0002] A shield machine is a tunnel boring machine that uses the shield method. The shield construction method is that the tunnel boring machine builds a "shield" for the tunnel while excavating, which is different from the open construction method. Internationally, a generalized shield machine can also be used in rock formations, but it is different from an open tunnel boring machine. In my country, tunnel boring machines used in soft soil formations are usually called shield machines, and those used in rock formations are called TBMs. Shield machines are generally divided into hand-dug shield machines, squeeze shield machines, semi-mechanical shield machines, and mechanical shield machines according to their working principles.

[0003] At present, the main drive sealing ring of the shield machine mainly adopts the form of a combination of a lip-shaped rubber sealing ring or a finger-shaped sealing ring and a VD sealing ring, and the two have similar structures. Taking the lip-shaped rubber sealing ring as an example, when working, it is necessary to continuously inject HBW grease into the sealing cavity formed by the pressure ring and the lip-shaped rubber sealing ring. The lip-shaped sealing ring provides back pressure for the grease. The grease forms a ring and is continuously squeezed into the soil bin at a higher pressure to prevent impurities such as high-pressure slag in the soil bin from entering the sealing cavity, thereby achieving a sealing effect. The following problems exist in the prior art:

[0004] (1) If the HBW grease is not injected in time, the impurities in the soil bin will enter the lip seal ring, and the lip of the lip seal ring will accelerate wear. The soil impurities in the soil bin will continue to enter the subsequent seal ring through the previous seal, causing the subsequent seal ring to wear. The impurities finally enter the main bearing, causing damage to the main bearing. Once the main bearing is damaged, the entire shield machine will be paralyzed, causing huge losses.

[0005] (2) The lip seal ring has been used for a long time and the normal wear of the lip has exceeded the limit, causing HBW grease to enter the lubrication cavity behind it, causing the lip seal to fail and unable to achieve the sealing effect.

[0006] (3) Although the finger-type seal ring has multiple lips, the seal material is too hard, causing great friction and rapid temperature rise during rotation. It is necessary to set a cooling channel for it, which makes the manufacturing process of the shield machine main drive complex and increases the cost. The process requirements for installing and maintaining the finger-type seal are high, which causes inconvenience. At the same time, the finger-type seal is too large, which increases the production cost. Utility Model Content

[0007] In view of the problem of sealing failure caused by excessive wear of the sealing ring in the prior art, the utility model provides a shield machine with a sealing ring of a composite structure, the purpose of which is to: enable the sealing ring to continue to be used after being worn, extend the service life of the sealing ring, prevent impurities from entering subsequent sealing rings, and thus extend the overall service life of the main drive.

[0008] The technical solution adopted by the utility model is as follows:

[0009] A shield machine with a composite structural sealing ring comprises: a shield machine driving device and a soil bin, wherein a cavity is arranged inside the shield machine driving device, and a plurality of composite structural sealing rings are fixedly arranged in the cavity, and a plurality of tooth openings are arranged at the bottom of the composite structural sealing ring, wherein the sizes of the tooth openings decrease successively, and the size of the tooth openings close to the soil bin is the largest.

[0010] By adopting the above scheme, several teeth at the bottom of the composite structure sealing ring can form several seals on the cavity in the main drive of the shield machine. When the tooth closest to the soil bin is worn, the second tooth forms a seal on the cavity under the elastic action of the composite structure sealing ring. When the second tooth is worn, the third tooth can continue to perform the sealing work. The sizes of several teeth decrease successively, and the size of the tooth close to the soil bin is the largest, which can ensure that the tooth close to the soil bin is sealed first, and the remaining teeth do not contact the side wall of the cavity. After the previous tooth is worn, the tooth adjacent to it is sealed. Through this structure, the technical effect of the sealing ring continuing to be practical after wear, extending the practical life of the composite structure sealing ring and extending the overall life of the main drive is achieved.

[0011] The shield machine driving device comprises a pressure ring, one end of the pressure ring away from the soil bin is connected to a front shield, a runway ring and a main bearing shaft are arranged inside the front shield, and a cavity is arranged between the front shield and the runway ring.

[0012] The tooth openings are provided with a first tooth opening, a second tooth opening, a third tooth opening, a fourth tooth opening and a fifth tooth opening. The first tooth opening is provided on a side close to the soil bin, and the first tooth opening has the largest size and the fifth tooth opening has the smallest size.

[0013] The above scheme is adopted, in which the first tooth mouth is arranged on the side of the cavity close to the soil bin. When the first tooth mouth is worn beyond the limit, the second tooth mouth is squeezed and assumes the sealing work. When the second tooth mouth is worn beyond the limit, the third tooth mouth is squeezed and assumes the sealing work, and so on. The composite structure sealing ring can provide sealing insurance for five tooth mouths to prevent the debris in the soil bin from entering the subsequent sealing rings, causing subsequent sealing damage and causing damage to the main bearing shaft equipment. The composite structure sealing ring of this structure can prevent the normal wear of the Chunkou from exceeding the limit, causing HBW grease to enter the rear lubrication cavity, causing the lip seal to fail and fail to achieve the sealing effect.

[0014] The composite structure sealing ring is made of nitrile rubber.

[0015] A plurality of spacer rings are arranged in the cavity, and the spacer rings include a first spacer ring, a second spacer ring and a third spacer ring.

[0016] By adopting the above scheme, the above-mentioned several composite structure sealing rings can be installed into the spacer ring, which makes the installation easier.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] 1. Through the several teeth at the bottom of the composite structure sealing ring, several seals can be formed on the cavity in the main drive of the shield machine. When the tooth closest to the soil bin is worn, the second tooth forms a seal on the cavity under the elastic action of the composite structure sealing ring. When the second tooth is worn, the third tooth can continue to undertake the sealing work. The sizes of several teeth decrease successively, and the size of the tooth close to the soil bin is the largest, which can ensure that the tooth close to the soil bin is sealed first, and the other teeth do not contact the side wall of the cavity. After the previous tooth is worn, the tooth adjacent to it is sealed. Through this structure, the technical effect of continuing to be practical after the sealing ring is worn, extending the practical life of the composite structure sealing ring and extending the overall life of the main drive is achieved.

[0019] 2. The first tooth mouth is arranged on the side close to the soil bin in the cavity. When the first tooth mouth is worn beyond the limit, the second tooth mouth is squeezed and takes on the sealing work. When the second tooth mouth is worn beyond the limit, the third tooth mouth is squeezed and takes on the sealing work, and so on. The composite structure sealing ring can provide sealing insurance for five tooth mouths to prevent the debris in the soil bin from entering the subsequent sealing rings, causing subsequent sealing damage and causing damage to the main bearing shaft equipment. The composite structure sealing ring of this structure can prevent the normal wear of the Chunkou from exceeding the limit, causing HBW grease to enter the rear lubrication cavity, causing the lip seal to fail and fail to achieve the sealing effect.

[0020] 3. The above-mentioned several composite structure sealing rings can be installed into the spacer ring, which makes the installation easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0022] Figure 1 It is a schematic diagram of the structure of the utility model from a side perspective;

[0023] Figure 2 It is a structural schematic diagram of the composite structure sealing ring of the utility model.

[0024] Figure numerals: 1-composite structure sealing ring; 2-pressure ring; 3-first spacer ring; 4-second spacer ring; 5-third spacer ring; 6-front shield; 7-runway ring; 8-soil bin; 9-main bearing; 10-first tooth mouth; 11-second tooth mouth; 12-third tooth mouth; 13-fourth tooth mouth; 14-fifth tooth mouth. DETAILED DESCRIPTION

[0025] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0026] Combine the following Figure 1 , Figure 2 The utility model is described in detail.

[0027] A shield machine with a composite structural sealing ring comprises: a shield machine drive device and a soil bin 8, wherein a cavity is arranged inside the shield machine drive device, and a plurality of composite structural sealing rings 1 are fixedly arranged in the cavity, and a plurality of teeth are arranged at the bottom of the composite structural sealing ring, wherein the sizes of the teeth decrease successively, and the size of the teeth close to the soil bin 8 is the largest.

[0028] The shield machine driving device includes a pressure ring 2, and the end of the pressure ring 2 away from the soil bin 8 is connected to the front shield 6. The front shield 6 is provided with a runway ring 7 and a main bearing shaft 9 inside, and a cavity is provided between the front shield 6 and the runway ring 7.

[0029] There are five tooth openings, namely the first tooth opening 10, the second tooth opening 11, the third tooth opening 12, the fourth tooth opening 13 and the fifth tooth opening 14. The first tooth opening 10 is arranged on the side close to the soil bin 8, and the first tooth opening 10 has the largest size and the fifth tooth opening 14 has the smallest size.

[0030] The composite structure sealing ring 1 is made of nitrile rubber.

[0031] A plurality of spacer rings are arranged in the cavity, and the spacer rings include a first spacer ring 3 , a second spacer ring 4 and a third spacer ring 5 .

[0032] In the above embodiment, the composite structure sealing ring 1 is used for the shield machine main drive operation sealing. When impurities in the soil bin 8 enter the preceding sealing ring, it can effectively prevent the impurities from entering the subsequent sealing ring, thereby ensuring the normal operation of the main drive. The composite structure sealing ring 1 is installed in the cavity between the shield machine main drive and the front shield 6.

[0033] When installing the device, it is installed inside the cavity formed between the main drive runway ring 7 and the front shield 6. After the composite structure sealing ring 1 is smeared with grease, it is installed on the third spacer ring 5 with its back against the soil bin 8. After it is installed in place, the second spacer ring 4 smeared with grease is installed. Then, after the composite structure sealing ring 1 is smeared with grease, it is installed on the second spacer ring 4 facing the soil bin 8. After it is installed in place, the first spacer ring 3 smeared with grease is installed into the cavity. After the composite structure sealing ring 1 is smeared with grease, it is installed on the first spacer ring 3 facing the soil bin 8. After it is installed in place, the pressure ring 2 smeared with grease is installed. Its specific structure is as follows: Figure 1 As shown, the installation order is from right to left.

[0034] The five teeth of the composite structure sealing ring 1 are not on the same plane, the first tooth 10 is the largest, the fifth tooth 14 is the smallest, the first tooth 10 is installed on the side of the composite structure sealing ring 1 close to the soil bin 8, and from the first tooth 10 to the fifth tooth 14, the size of the tooth decreases successively. Under this structure, it is necessary to ensure that the five teeth are within the compression range of the composite structure sealing ring 1 to ensure that each tooth can perform basic sealing work. Through this structure, the first tooth 10 is in contact with the runway ring 7. , and when performing sealing work, the remaining teeth do not contact the runway ring 7. When the first tooth 10 is worn beyond the limit, the second tooth 11 is squeezed because the composite structure sealing ring 1 loses the support of the first tooth 10. After the second tooth 11 is worn beyond the limit, the third tooth 12 is squeezed because the composite structure sealing ring 1 loses the support of the second tooth 11. And so on. The composite structure sealing ring 1 has a sealing insurance of five teeth. After the composite sealing ring 1 close to the soil bin 8 completely fails, the subsequent composite structure sealing ring 1 continues to assume the sealing function.

[0035] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A shield machine with a composite structural sealing ring, characterized in that: include: A shield machine drive device and a soil bin (8), wherein a cavity is arranged inside the shield machine drive device, a plurality of composite structure sealing rings (1) are fixedly arranged in the cavity, a plurality of tooth openings are arranged at the bottom of the composite structure sealing ring (1), the sizes of the tooth openings decrease successively, and the tooth openings close to the soil bin (8) have the largest size.

2. A shield machine with a composite structure sealing ring according to claim 1, characterized in that: The shield machine driving device comprises a pressure ring (2), one end of the pressure ring (2) away from the soil bin (8) is connected to a front shield (6), a runway ring (7) and a main bearing shaft (9) are arranged inside the front shield (6), and the cavity is arranged between the front shield (6) and the runway ring (7).

3. The shield machine with a composite structure sealing ring according to claim 1, characterized in that: The tooth openings are provided with five teeth, namely a first tooth opening (10), a second tooth opening (11), a third tooth opening (12), a fourth tooth opening (13) and a fifth tooth opening (14); the first tooth opening (10) is provided on a side close to the soil bin (8), and the first tooth opening (10) has the largest size, while the fifth tooth opening (14) has the smallest size.

4. A shield machine with a composite structure sealing ring according to claim 1, characterized in that: The composite structure sealing ring is made of nitrile rubber.

5. The shield machine with a composite structure sealing ring according to claim 1, characterized in that: A plurality of spacer rings are arranged in the cavity, and the spacer rings include a first spacer ring (3), a second spacer ring (4) and a third spacer ring (5).

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