A gate sealing device for a tunneling machine

Abstract

The utility model discloses a kind of gate sealing devices of shield machine, belong to shield machine gate technical field.Aiming at the problem that shield machine gate sealing effect in prior art needs to be improved, the utility model greatly improves sealing reliability by bilateral main and auxiliary sealing elements synergistic effect, slag ring active interception impurity, compression spring provides thrust to continue to compensate the wear of dynamic sealing lip, ensure the close fit under high pressure;Pressure cavity introduces medium pressure to form self-tight type sealing, significantly reduce sealing lip load, prolong service life;Leakage chamber design combines pressure detector and indicator light, realize real-time alarm and early intervention of leakage, avoid sudden failure;Grease hole supports maintenance without stopping, inject sealant can temporarily repair microleakage.The overall structure has self-adapting sealing ability under high pressure, complex working condition of slag, maintenance cost is significantly reduced, safety redundancy is comprehensively enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of shield machine gate technology, specifically relating to a gate sealing device for a shield machine. Background Technology

[0002] As the core equipment in tunnel engineering, the tunnel boring machine (TBM) isolates its excavation chamber from the external environment through a gate system. In the high-pressure, high-abrasion environment of excavated soil, the gates need to be frequently opened and closed to transfer materials or personnel. Therefore, the reliability of the sealing device directly affects construction safety and efficiency. Existing gate seals mostly use a single-stage rubber seal structure, relying on the mechanical clamping force when the gate closes to achieve a seal. However, under conditions of soil particle intrusion, pressure fluctuations (0.5-6 bar), and repeated friction of the gate plate, the sealing lip is prone to localized wear or scratches, leading to seal failure. More seriously, traditional structures lack an automatic wear compensation mechanism. Once a micro-leak occurs, it cannot provide timely warning, until the liquid / slag leakage intensifies, forcing equipment shutdown for maintenance. A single downtime due to a fault can result in losses of hundreds of thousands of yuan. Industry research shows that approximately 37% of unplanned TBM shutdowns are related to gate seal failures (data source: "Technical Guidelines for Maintenance of Tunnel Construction Equipment" 2023), highlighting the urgent need to improve seal durability and intelligent monitoring.

[0003] This invention aims to solve or at least alleviate the problem of poor gate sealing performance by providing a gate sealing device for a tunnel boring machine. Utility Model Content

[0004] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a gate sealing device for a tunnel boring machine, which has the advantage of enhancing the gate sealing effect.

[0005] To achieve the above objectives, this utility model provides a gate sealing device for a tunnel boring machine, comprising:

[0006] The main and secondary seals, symmetrically arranged on both sides, are installed in the gate slots on both sides of the gate.

[0007] The dynamic sealing lip is located on the side of the main seal and the secondary seal closest to the gate, and slides in contact with the gate.

[0008] The pressure inlet hole is located in the main seal and introduces the pressure medium inside the tunnel boring machine into the pressure chamber.

[0009] The pressure chamber is formed on the back of the main seal and the secondary seal and communicates with the pressure inlet hole;

[0010] A compression spring is placed between the slag-blocking ring and the dynamic sealing lip to continuously push the dynamic sealing lip to press the gate plate;

[0011] The vent chamber, located at the end of the secondary seal, is used to collect leaked liquid;

[0012] The pressure detector is installed inside the venting chamber and connected to an external indicator light to trigger a leak alarm.

[0013] As a further improvement of this utility model, the dynamic sealing lip is linked with the compression spring, and the dynamic sealing lip is pressed tightly against the gate by the spring preload.

[0014] As a further improvement of this utility model, both the main seal and the secondary seal are provided with grease holes for injecting sealant or lubricating grease.

[0015] As a further improvement of this utility model, multiple sets of compression springs are evenly arranged along the lifting direction of the gate.

[0016] As a further improvement of this utility model, both the main sealing element and the secondary sealing element are provided with slag-blocking rings, which are set close to the surface of the gate plate to block external impurities.

[0017] As a further improvement of this utility model, the slag-blocking ring has a wedge-shaped structure with its inclined surface facing the direction of impurity entry.

[0018] As a further improvement of this utility model, the pressure detector is a pressure sensor with an adjustable trigger threshold.

[0019] In summary, the beneficial effects of the above-described technical solutions conceived by this utility model compared with the prior art include:

[0020] This invention significantly improves sealing reliability through the synergistic effect of dual main and auxiliary seals. The slag-blocking ring actively intercepts impurities, while the compression spring provides thrust to continuously compensate for wear on the dynamic sealing lip, ensuring a tight fit under high pressure. The pressure chamber introduces medium pressure to form a self-tightening seal, significantly reducing the load on the sealing lip and extending its service life. The venting chamber design, combined with a pressure detector and indicator light, enables real-time leak alarms and early intervention, preventing sudden malfunctions. The grease hole supports maintenance without shutting down the system, and injecting sealant can temporarily repair minor leaks. The overall structure possesses adaptive sealing capabilities under high pressure and complex slag conditions, significantly reducing maintenance costs and comprehensively enhancing safety redundancy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a gate sealing device for a tunnel boring machine according to the present invention.

[0022] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0023] Main seal 1; Secondary seal 2; Gate 3; Slag-blocking ring 4; Dynamic sealing lip 5;

[0024] 6. Pressure inlet hole; 7. Pressure chamber; 8. Static sealing lip; 9. Clamping device; 10. Compression spring;

[0025] 11. Relief chamber; 12. Pressure detector; 13. Indicator light; 14. Grease hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0028] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0029] like Figure 1 As shown, a gate sealing device for a tunnel boring machine includes: a main seal 1 and a secondary seal 2 symmetrically arranged on both sides, respectively installed in the gate slots on both sides of the gate plate 3; a dynamic sealing lip 5 located on the side of the main seal 1 and the secondary seal 2 closest to the gate plate 3, slidingly contacting the gate plate 3; a pressure inlet hole 6 opened in the main seal 1, introducing the internal pressure medium of the tunnel boring machine into the pressure chamber 7; the pressure chamber 7 formed on the back of the main seal 1 and the secondary seal 2, communicating with the pressure inlet hole 6; a compression spring 10 disposed between the slag-blocking ring 4 and the dynamic sealing lip 5, continuously pushing the dynamic sealing lip 5 to press the gate plate 3; a venting chamber 11 located at the end of the secondary seal 2, used to collect leaked liquid; and a pressure detector 12 installed in the venting chamber 11, connected to an external indicator light 13, and linked to realize a leak alarm.

[0030] The slag-retaining ring 4 located in the main sealing element 1 can scrape off the impurities adhering to the surface of the gate plate 3. The dynamic sealing lip 5 can tightly adhere to the surface of the gate plate 3 to ensure sealing. The fluid flows into the pressure chamber 7 from the pressure inlet hole 6. Due to the pressure of the fluid itself, the pressure chamber 7 can tightly adhere to the gate plate 3 to further ensure sealing.

[0031] In a preferred embodiment of this invention, the dynamic sealing lip 5 is linked to the compression spring 10, and the spring preload keeps the dynamic sealing lip 5 tightly against the gate plate 3. When the dynamic sealing lip 5 wears, the compression spring 10 provides thrust to compensate for the wear.

[0032] In a preferred embodiment of this invention, both the main seal 1 and the secondary seal 2 are provided with grease holes 14 for injecting sealant or grease. Injecting sealant or grease between the gate 3 and the main seal 1 or the secondary seal 2 ensures smooth movement of the gate 3 during its movement.

[0033] In a preferred embodiment of this invention, multiple sets of compression springs 10 are evenly arranged along the lifting direction of the gate plate 3. Arranging multiple sets of compression springs 10 allows the dynamic sealing lip 5 to fit more tightly against the gate plate 3.

[0034] As a preferred embodiment of this utility model, both the main sealing element 1 and the secondary sealing element 2 are provided with slag-blocking rings 4, which are set close to the surface of the gate plate 3 to block external impurities.

[0035] In a preferred embodiment of this invention, the slag-blocking ring 4 has a wedge-shaped structure with its inclined surface facing the direction in which impurities enter. The wedge-shaped structure of the slag-blocking ring 4 facilitates the removal of impurities from the gate plate 3.

[0036] In a preferred embodiment of this invention, the pressure detector 12 is a pressure sensor with an adjustable trigger threshold. When a suitable trigger threshold is set, and the pressure inside the pressure chamber 7 reaches the threshold, the indicator light 13 illuminates, at which point the equipment needs to be shut down for maintenance.

[0037] Working principle: When the gate 3 is closed, the slag-blocking ring 4 first adheres to the surface of the gate 3 to block the intrusion of external slag particles. The compression spring 10 continuously pushes the dynamic sealing lip 5 to adhere tightly to the gate 3 to form an initial seal. The high-pressure medium inside the tunnel boring machine enters the pressure chamber 7 on the back of the main seal 1 and the secondary seal 2 through the pressure inlet hole 6, pushing the pressure chamber 7 to move towards the gate 3, so that the dynamic sealing lip 5 obtains a pressure self-tightening sealing force. The sealing strength increases with the increase of the medium pressure. The compression spring 10 compensates for the wear displacement of the dynamic sealing lip 5 in real time to maintain a constant sealing pressure. If the main seal 1 fails and causes liquid leakage, the leaked liquid flows into the venting chamber 11 at the end of the secondary seal 2 and accumulates. The chamber pressure increases, triggering the pressure detector 12 and the indicator light 13 to alarm. At this time, sealant can be injected through the grease holes 14 of the main seal 1 and the secondary seal 2 to temporarily repair the micro-leakage.

[0038] In summary, this invention significantly improves sealing reliability through the synergistic effect of dual main and auxiliary seals. The slag-blocking ring actively intercepts impurities, while the compression spring provides thrust to continuously compensate for the wear of the dynamic sealing lip, ensuring a tight fit under high pressure. The pressure chamber introduces medium pressure to form a self-tightening seal, significantly reducing the load on the sealing lip and extending its service life. The venting chamber design, combined with a pressure detector and indicator light, enables real-time leak alarms and early intervention, preventing sudden failures. The grease hole supports maintenance without shutting down the system, and injecting sealant can temporarily repair minor leaks. The overall structure possesses adaptive sealing capabilities under high pressure and complex slag conditions, significantly reducing maintenance costs and comprehensively enhancing safety redundancy.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gate sealing device for a tunnel boring machine, characterized in that, include: The main seal (1) and the secondary seal (2) are symmetrically arranged on both sides and are respectively installed in the door grooves on both sides of the gate (3); The dynamic sealing lip (5) is located on the side of the main seal (1) and the secondary seal (2) close to the gate (3) and slides in contact with the gate (3); The pressure inlet hole (6) is opened in the main seal (1) to introduce the internal pressure medium of the tunnel boring machine into the pressure chamber (7). The pressure chamber (7) is formed on the back of the main seal (1) and the secondary seal (2) and is connected to the pressure inlet hole (6); A compression spring (10) is placed between the slag-blocking ring (4) and the dynamic sealing lip (5) to continuously push the dynamic sealing lip (5) to press the gate (3). The vent chamber (11), located at the end of the secondary seal (2), is used to collect leaked liquid; The pressure detector (12) is installed in the venting chamber (11) and connected to an external indicator light (13) to trigger a leak alarm.

2. The gate sealing device according to claim 1, characterized in that: The dynamic sealing lip (5) is linked with the compression spring (10), and the dynamic sealing lip (5) is pressed tightly against the gate plate (3) by the spring preload.

3. The gate sealing device according to claim 1, characterized in that: Both the main seal (1) and the secondary seal (2) are provided with grease holes (14) for injecting sealant or grease.

4. The gate sealing device according to claim 1, characterized in that: Multiple sets of compression springs (10) are evenly arranged along the lifting direction of the gate (3).

5. The gate sealing device according to claim 1, characterized in that: Both the main seal (1) and the secondary seal (2) are equipped with slag-blocking rings (4), which are set close to the surface of the gate (3) to block external impurities.

6. The gate sealing device according to claim 5, characterized in that: The slag-blocking ring (4) has a wedge-shaped structure with its inclined surface facing the direction of impurity entry.

7. The gate sealing device according to claim 1, characterized in that: The pressure detector (12) is a pressure sensor with an adjustable trigger threshold.

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