Sealing device for shield tail of shield tunneling machine

Abstract

The utility model discloses a sealing device for a shield tail of a shield tunneling machine, which comprises a shield tail shell, a sealing groove is arranged on the inner wall of the shield tail shell, a multi-layer composite sealing ring is arranged in the sealing groove, and an air bag component is connected to the inner wall of the shield tail shell and positioned on the inner side of the multi-layer composite sealing ring. The multi-layer composite sealing ring sequentially comprises an elastic sealing ring, a wear-resistant sealing ring and a waterproof sealing ring from inside to outside, a pressure compensation assembly is arranged between the elastic sealing ring and the wear-resistant sealing ring, and a self-cleaning assembly is arranged on the outer side of the multi-layer composite sealing ring assembly. According to the sealing device, when the shield tunneling machine conducts underground tunneling, the multi-layer composite sealing ring is tightly attached to the duct piece and the shield tail, the elastic sealing ring provides preliminary sealing, the abrasion-resistant sealing ring resists abrasion, the waterproof sealing ring prevents water permeation, and the pressure compensation assembly ensures that the sealing ring can still keep appropriate compression when bearing the internal and external pressure difference; the sealing effect is maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of shield machines, in particular to a sealing device for the tail of a shield machine. Background Art

[0002] The shield machine, whose full name is shield tunnel boring machine, is a kind of engineering machinery used for tunnel excavation. During the construction process, it cuts the soil or rock through the cutter disc in front, and at the same time forms a temporary support structure (i.e. "shield") behind the machine to prevent the surrounding soil from collapsing during the excavation process. The shield machine can excavate continuously and transport the excavated soil and stone materials to the ground through a conveyor belt, which greatly improves the efficiency and safety of tunnel construction. Shield machines are usually used in the construction of large-scale infrastructure such as urban subways, highway tunnels, and water conservancy tunnels. Especially when the geological conditions are complex, the groundwater level is high, and when crossing densely built areas, the use of shield machines for underground excavation has obvious advantages.

[0003] The existing shield tail seal of the shield machine is mainly sealed by a combination of a wire brush and sealing grease. The wire brush contacts the pipe segment and prevents the invasion of foreign matter through the close arrangement and elasticity of the brush. However, the wire brush is easy to wear during actual use and needs to be replaced regularly. Otherwise, foreign objects may be stuck in the gaps caused by the wear of the wire brush, causing the sealing structure of the shield tail to fail. Utility Model Content

[0004] 1. Technical Problems Solved

[0005] The technical problem to be solved by the utility model is the various problems mentioned in the above background technology, and provides a sealing device for the shield tail of a shield machine.

[0006] 2. Technical Solution

[0007] In order to solve the above technical problems, the technical solution provided by the utility model is: a sealing device for the tail of a shield machine, comprising a tail shell, the inner wall of the tail shell is provided with a sealing groove, a multi-layer composite sealing ring is provided in the sealing groove, the inner wall of the tail shell is located on the inner side of the multi-layer composite sealing ring and is connected to an airbag assembly, the multi-layer composite sealing ring comprises an elastic sealing ring, a wear-resistant sealing ring and a waterproof sealing ring from the inside to the outside, a pressure compensation assembly is provided between the elastic sealing ring and the wear-resistant sealing ring, and a self-cleaning assembly is provided on the outside of the multi-layer composite sealing ring assembly.

[0008] As an improvement, the pressure compensation component includes a pressure sensor, a pressure-compensating air pipe and a micro air pump. The micro air pump is fixedly connected to the inner wall of the shield tail shell. The pressure sensor is installed between the elastic sealing ring and the wear-resistant sealing ring. The output end of the micro air pump is connected to the pressure-compensating air pipe, and the other end of the pressure-compensating air pipe is connected to the elastic sealing ring.

[0009] As an improvement, the airbag assembly includes a compensation airbag and a compensation air pipe, the compensation airbag is connected to the inner wall of the shield tail shell, one end of the compensation air pipe is connected to the output end of the micro air pump, and the other end is connected to the compensation airbag.

[0010] As an improvement, the micro air pump is electrically connected to a pressure sensor.

[0011] As an improvement, the self-cleaning component includes a rotating brush installed on the outer edge of the wear-resistant sealing ring.

[0012] As an improvement, the elastic sealing ring is made of high-elasticity EPDM rubber material, the wear-resistant sealing ring is made of high-hardness polyurethane material, and the waterproof sealing ring is made of fluororubber material.

[0013] 3. Beneficial Effects

[0014] The advantages of the utility model compared with the prior art are: the sealing device of the present application enables the multi-layer composite sealing ring to fit tightly between the pipe segment and the shield tail of the shield machine during underground excavation, the elastic sealing ring provides initial sealing, the wear-resistant sealing ring resists wear, the waterproof sealing ring prevents moisture penetration, the pressure compensation component ensures that the sealing ring can still maintain appropriate compression when subjected to the internal and external pressure difference to maintain the sealing effect, the self-cleaning component removes impurities through a rotating brush, reduces wear and the burden on the sealing ring, and when the multi-layer composite sealing ring is worn out due to long-term use and the sealing fails, the bulging of the compensation airbag can achieve a temporary sealing effect to ensure that the operation of the shield machine is not interrupted, thereby improving the sealing effect of the entire sealing device during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a structural diagram of a sealing device for the shield tail of a shield machine.

[0016] Figure 2 The utility model is a cross-sectional view of a sealing device for a shield tail of a shield machine.

[0017] Figure 3 It is an enlargement of the sealing device A at the tail of a shield machine of the utility model.

[0018] As shown in the figure: 1. Shield tail shell; 2. Sealing groove; 3. Multi-layer composite sealing ring; 4. Elastic sealing ring; 5. Wear-resistant sealing ring; 6. Waterproof sealing ring; 7. Pressure sensor; 8. Compensating air pipe; 9. Micro air pump; 10. Compensating air bag; 11. Compensating air pipe; 12. Rotating brush. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0020] Embodiment 1

[0021] like Figure 1 — Figure 3 As shown, a sealing device for the tail of a shield machine comprises a tail shell 1, the inner wall of the tail shell 1 is provided with a sealing groove 2, a multi-layer composite sealing ring 3 is provided in the sealing groove 2, the inner wall of the tail shell 1 is located inside the multi-layer composite sealing ring 3 and is connected to an airbag assembly, the airbag assembly comprises a compensation airbag 10 and a compensation air pipe 11, the compensation airbag 10 is connected to the inner wall of the tail shell 1, one end of the compensation air pipe 11 is connected to the output end of a micro air pump 9, and the other end is connected to the compensation airbag 10. The compensation airbag 10 is mainly used to temporarily seal the multi-layer composite sealing ring 3 when it is worn out during long-term use, so as to ensure that the operation of the shield machine is not interrupted.

[0022] like Figure 1 — Figure 3 As shown, the multi-layer composite sealing ring 3 includes an elastic sealing ring 4, a wear-resistant sealing ring 5 and a waterproof sealing ring 6 from the inside to the outside. A pressure compensation component is provided between the elastic sealing ring 4 and the wear-resistant sealing ring 5. The pressure compensation component includes a pressure sensor 7, a pressure-compensating air pipe 8 and a micro air pump 9. The micro air pump 9 adopts the MP-100 model and is fixedly connected to the inner wall of the shield tail shell 1. The pressure sensor 7 adopts the PS-2000 model and is installed between the elastic sealing ring 4 and the wear-resistant sealing ring 5. It can monitor the pressure changes inside the sealing ring in real time. The output end of the micro air pump 9 is connected to the pressure-compensating air pipe 8, and the other end of the pressure-compensating air pipe 8 is connected to the elastic sealing ring 4. The micro air pump 9 is electrically connected to the pressure sensor 7. When it is detected that the pressure drops to a preset minimum value (such as 0.3MPa), it automatically starts to replenish air into the sealing ring to restore it to the standard working pressure (such as 0.5MPa).

[0023] like Figure 1 — Figure 3 As shown, a self-cleaning component is provided on the outside of the multi-layer composite sealing ring 3 component, and the self-cleaning component includes a rotating brush 12 installed on the outer edge of the wear-resistant sealing ring 5. The rotating brush 12 is fixed to the outer edge of the wear-resistant sealing ring 5. As the shield machine rotates, the dirt and gravel attached to the surface of the sealing ring are removed to keep the sealing surface clean.

[0024] Elastic sealing ring 4: Made of highly elastic EPDM rubber material with a thickness of 5mm, it ensures that it can fit tightly into the gap between the shield tail and the segment when the shield machine is advancing, providing a basic sealing effect.

[0025] Wear-resistant sealing ring 5: Made of high-hardness polyurethane material, 3 mm thick, located outside the elastic sealing ring 4, it increases wear resistance and extends the service life of the overall sealing ring.

[0026] Waterproof sealing ring 6: Made of special fluororubber material, 2mm thick, the outermost layer provides an additional waterproof barrier to prevent groundwater penetration.

[0027] The working principle of the utility model is as follows: when the shield machine is excavating underground, the multi-layer composite sealing ring 3 fits tightly between the pipe segment and the shield tail, the elastic sealing ring 4 provides preliminary sealing, the wear-resistant sealing ring 5 resists wear, the waterproof sealing ring 6 prevents moisture penetration, and the pressure compensation component ensures that the sealing ring can still maintain appropriate compression when subjected to the internal and external pressure difference to maintain the sealing effect. The self-cleaning component removes impurities through the rotating brush 12 to reduce wear and the burden on the sealing ring. In actual use, when the shield machine is working and the multi-layer composite sealing ring 3 is worn out due to long-term use, resulting in sealing failure, the bulging of the compensation airbag 10 can achieve a temporary sealing effect to ensure that the operation of the shield machine is not interrupted.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0030] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A sealing device for a shield tail of a shield machine, comprising a shield tail housing (1), characterized in that: The inner wall of the shield tail shell (1) is provided with a sealing groove (2), a multi-layer composite sealing ring (3) is provided in the sealing groove (2), an airbag assembly is connected to the inner wall of the shield tail shell (1) and the inner side of the multi-layer composite sealing ring (3), the multi-layer composite sealing ring (3) comprises an elastic sealing ring (4), a wear-resistant sealing ring (5) and a waterproof sealing ring (6) from the inside to the outside, a pressure compensation assembly is provided between the elastic sealing ring (4) and the wear-resistant sealing ring (5), and a self-cleaning assembly is provided on the outer side of the multi-layer composite sealing ring (3) assembly.

2. The sealing device for the tail of a shield machine according to claim 1, characterized in that: The pressure compensation component comprises a pressure sensor (7), a pressure compensation air pipe (8) and a micro air pump (9); the micro air pump (9) is fixedly connected to the inner wall of the shield tail shell (1); the pressure sensor (7) is installed between the elastic sealing ring (4) and the wear-resistant sealing ring (5); the output end of the micro air pump (9) is connected to the pressure compensation air pipe (8); and the other end of the pressure compensation air pipe (8) is connected to the elastic sealing ring (4).

3. The sealing device for the tail of a shield machine according to claim 2, characterized in that: The airbag assembly comprises a compensation airbag (10) and a compensation air pipe (11); the compensation airbag (10) is connected to the inner wall of the shield tail shell (1); one end of the compensation air pipe (11) is connected to the output end of the micro air pump (9), and the other end is connected to the compensation airbag (10).

4. The sealing device for the tail of a shield machine according to claim 3 is characterized in that: The micro air pump (9) is electrically connected to the pressure sensor (7).

5. The sealing device for the tail of a shield machine according to claim 1, characterized in that: The self-cleaning component comprises a rotating brush (12) mounted on the outer edge of the wear-resistant sealing ring (5).

6. The sealing device for the tail of a shield machine according to claim 1, characterized in that: The elastic sealing ring (4) is made of high-elasticity EPDM rubber material, the wear-resistant sealing ring (5) is made of high-hardness polyurethane material, and the waterproof sealing ring (6) is made of fluororubber material.

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