Main drive seal of shield machine with automatic compensation and main drive seal structure

Abstract

The present invention discloses a shield machine main drive seal with automatic compensation, including a seal body, a water-expandable compensating body and an elastic body, wherein the seal body is an annular body; an annular groove is provided on the outer end surface of the seal body and close to its inner side surface, and a sealing lip is formed from the annular groove to the inner side surface of the seal body; the elastic body is placed at the bottom of the groove, and the water-expandable compensating body is embedded in the part where the inner end surface and the outer side surface of the seal body intersect. The present invention is composed of three parts combined together to form an automatic compensation shield machine main drive seal. When the main drive seal is worn, a small amount of a mixture of slag and water enters the grease cavity and contacts the water-expandable compensating body. The water-expandable compensating body will automatically expand and squeeze the sealing lip of the main drive seal to fit tightly against the sealing ring of the main drive rotating part, thereby restoring its sealing performance and achieving the effect of automatic compensation of the main seal, thereby preventing slag from entering the main drive and causing damage to the internal parts of the main drive.

Description

Technical Field

[0001] The invention relates to a main drive seal for a shield machine, in particular to a main drive seal for a shield machine with automatic compensation and a main drive seal structure. Background Art

[0002] The shield machine uses the main drive to drive the cutter head to rotate to cut the rock and soil. The cut rock and soil are mixed evenly in the soil bin and transported to the shield body by the shield machine's slag discharge system, and then transported to the ground through the auxiliary system. Therefore, the soil bin and the shield body need to be separated by a partition. The main drive is installed on the partition between the ground bin and the shield body. Since the main drive is composed of fixed parts and rotating parts, the main drive seal is installed between the fixed parts and rotating parts of the main drive to isolate the slag and prevent the slag from entering the main drive and damaging the rotating parts inside the main drive.

[0003] At present, the seals used in shield machines are all conventional seals, which have no active compensation performance after wear. Therefore, the seals must be checked before each use of the shield machine and replaced as appropriate. If long-distance excavation is encountered, the main drive is often damaged due to seal wear, causing the main drive to operate with problems. In severe cases, the main drive will be directly damaged and cannot work normally. In this case, the machine needs to be shut down and the main drive needs to be replaced in the tunnel. This not only requires a huge workload, but also because the soil bin will be directly connected to the shield body during the removal of the main drive, which is easy to cause the danger of collapse of the excavation face. Summary of the invention

[0004] In order to overcome the above defects, the present invention provides a shield machine main drive seal with automatic compensation and a main drive seal structure, which can realize automatic compensation of the wear amount of the main seal after the sealing lip is worn, thereby ensuring the absolute sealing of the main drive.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a main drive seal of a shield machine with automatic compensation, including a sealing body, a water-expanding compensating body and an elastomer, the sealing body is an annular body, having relative inner and outer end faces, as well as inner and outer side faces; an annular groove is provided on the outer end face of the sealing body and close to its inner side face, and a sealing lip is formed from the annular groove to the inner side face of the sealing body; the elastomer is placed at the bottom of the groove, and the water-expanding compensating body is embedded in the part where the inner end face and the outer side face of the sealing body intersect.

[0006] As a further improvement of the present invention, the sealing body is made of a wear-resistant rubber material, the water-self-expanding compensating body is made of a water-expanding rubber material, and the elastomer is made of an elastic material.

[0007] The present invention also provides a shield machine main drive sealing structure, including a main drive fixed component located on the outside and a main drive rotating component located on the inside, a main drive seal is arranged between the main drive fixed component and the main drive rotating component, and the main drive seal is the above-mentioned shield machine main drive seal.

[0008] As a further improvement of the present invention, three main drive seals are sequentially arranged between the main drive fixed component and the main drive rotating component: a first main drive seal, a second main drive seal and a third main drive seal, the sealing lips of the three main drive seals are respectively pressed against the main drive rotating component, and spacer rings are arranged between adjacent main drive seals, and the first main drive seal located on the outermost side is provided with a sealing pressure ring outside and is close to the soil bin side of the shield machine; the sealing lips of the first main drive seal and the second main drive seal are facing the soil bin side of the shield machine, and the sealing lip of the third main drive seal is facing the inner side of the shield body of the shield machine.

[0009] As a further improvement of the present invention, a grease chamber is provided between the first main drive seal and the second main drive seal.

[0010] The beneficial effects of the present invention are:

[0011] 1. The main seal can automatically compensate for the wear of the sealing lip after it is worn, and can automatically restore its sealing performance;

[0012] 2. The seal installation dimensions of the present invention are the same as those of the main drive seal and can be directly interchanged;

[0013] 3. Simple structure, automatic compensation, no need for human intervention, no need to add additional equipment, easy to operate;

[0014] 4. The sealing materials used in the present invention are all common materials, which are easy to obtain and have high economic and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the main drive seal of the present invention;

[0016] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of;

[0017] Figure 3 This is a diagram showing the use status of the main drive seal of the present invention.

[0018] Combined with the accompanying drawings, the following description is given:

[0019] 1——Seal body; 2——Water-expanding compensating body;

[0020] 3——elastic body; 4——groove;

[0021] 5——sealing lip; 11——main drive fixed component;

[0022] 12——main drive rotating component; 13——first main drive seal;

[0023] 14——Second main drive seal; 15——Third main drive seal;

[0024] 16——Spacer ring; 17——Sealing pressure ring;

[0025] 18——the side of the earthen silo; 19——the inner side of the shield;

[0026] 20 – Grease cavity. DETAILED DESCRIPTION

[0027] A preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. However, the protection scope of the present invention is not limited to the following embodiments, that is, any simple equivalent changes and modifications made within the scope of the present invention's patent application and the contents of the specification are still within the scope of the present invention's patent.

[0028] See also Figure 1-3 , is a shield machine main drive sealing structure described in the present invention, comprising a main drive fixed component 11 located on the outside and a main drive rotating component 12 located on the inside, and three main drive seals are arranged in sequence between the main drive fixed component and the main drive rotating component: a first main drive seal 13, a second main drive seal 14 and a third main drive seal 15. The sealing lips of the three main drive seals are respectively pressed against the main drive rotating component, and a spacing ring 16 is arranged between adjacent main drive seals, and a sealing pressure ring 17 is arranged outside the first main drive seal located on the outermost side and close to the soil bin side 18 of the shield machine; the sealing lips of the first main drive seal and the second main drive seal face the soil bin side 18 of the shield machine, and the sealing lips of the third main drive seal face the inner side 19 of the shield body of the shield machine. A grease chamber 20 is arranged between the first main drive seal 13 and the second main drive seal 14.

[0029] Among them, the three main drive seals include a seal body 1, a water-expandable compensating body 2 and an elastic body 3. The seal body 1 is an annular body, having opposite inner and outer end faces, as well as inner and outer side faces; an annular groove 4 is provided on the outer end face of the seal body 1 and close to its inner side face, and a sealing lip 5 is formed from the annular groove 4 to the inner side face of the seal body 1; the elastic body 3 is placed at the bottom of the groove 4, and the water-expandable compensating body 2 is embedded in the junction of the inner end face and the outer side face of the seal body 1. The seal body 1 is made of wear-resistant rubber material, the water-expandable compensating body 2 is made of water-expandable rubber material, and the elastic body 3 is made of elastic material.

[0030] The present invention utilizes the performance of water-expanding rubber to compensate for the wear of the sealing lip. Generally speaking, the tunneling tunnel of a shield machine has a certain length. It is difficult to replace the main drive seal after it is damaged during the excavation process. The main drive seal will also wear during normal operation, thereby reducing the sealing effect, and even debris will enter the main drive and cause damage to the main drive. Figure 3 The present invention has three main drive seals on the main drive, two of which have sealing lips facing the soil bin side to block the slag, and one of which has sealing lips facing the main drive side to block the lubrication leakage in the reducer. The three main drive seals are separated by spacer rings. When the shield machine is working, grease is continuously added between the first main drive seal and the second main drive seal. The grease will be discharged to the soil bin through the first main drive seal, and the second main drive seal will seal the grease to prevent the grease from entering the main drive side. Due to the uncertainty of the working conditions, the sealing lip of the first main drive seal will have unexpected wear. At this time, the sealing effect of the first main drive seal will deteriorate, and a small amount of slag and water mixture will enter the grease cavity and contact the water-expanding compensating body 2. The water-expanding compensating body 2 will automatically expand and squeeze the main drive sealing lip to be close to the sealing ring of the main drive rotating part, restore its sealing performance, and achieve the effect of automatic compensation of the main drive seal, thereby preventing slag from entering the main drive and causing damage to the internal parts of the main drive.

[0031] It can be seen that the present invention is composed of three parts, namely, the seal body, the water-expandable compensating body and the elastic body, which are combined together to form the shield machine main drive seal with automatic compensation. When the main drive seal is worn, a small amount of the mixture of slag and water enters the grease cavity and contacts the water-expandable compensating body. The water-expandable compensating body will automatically expand and squeeze the sealing lip of the main drive seal to fit tightly with the sealing ring of the main drive rotating part, thereby restoring its sealing performance and achieving the effect of automatic compensation of the main seal, thereby preventing slag from entering the main drive and causing damage to the internal parts of the main drive.

Claims

1. A shield machine main drive sealing structure, comprising a main drive fixed component (11) located outside and a main drive rotating component (12) located inside, wherein a main drive seal is arranged between the main drive fixed component and the main drive rotating component, characterized in that: The main drive seal comprises a seal body (1), a water-expandable compensating body (2) and an elastic body (3); the seal body is an annular body having an inner end face and an outer end face opposite to each other, and an inner side face and an outer side face; an annular groove (4) is provided on the outer end face of the seal body and close to the inner side face thereof, and a sealing lip (5) is formed from the annular groove to the inner side face of the seal body; the elastic body is placed at the bottom of the groove, and the water-expandable compensating body is embedded in the junction of the inner end face and the outer side face of the seal body; the seal body (1) is made of a wear-resistant rubber material, the water-expandable compensating body (2) is made of a water-expandable rubber material, and the elastic body is made of an elastic material; Three main drive seals are arranged in sequence between the main drive fixed component and the main drive rotating component: a first main drive seal (13), a second main drive seal (14) and a third main drive seal (15); the sealing lips of the three main drive seals are respectively pressed against the main drive rotating component, and a spacing ring (16) is arranged between adjacent main drive seals; and the first main drive seal located at the outermost side is provided with a sealing pressure ring (17) outside and is close to the soil bin side (18) of the shield machine; the sealing lips of the first main drive seal and the second main drive seal face the soil bin side (18) of the shield machine, and the sealing lips of the third main drive seal face the inner side (19) of the shield body of the shield machine; A grease chamber (20) is provided between the first main drive seal (13) and the second main drive seal (14); When the shield machine is working, grease is continuously added between the first main drive seal and the second main drive seal. The grease will be discharged to the soil bin through the first main drive seal, while the second main drive seal will seal the grease to prevent it from entering the main drive side.

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