一种盾构螺旋机用的轴承密封结构

By combining a multi-layer lip seal, sealing spacer, and grease barrier structure with a ball joint floating design, the sealing failure problem of the shield tunneling auger bearing seal in a high-pressure mud and sand environment was solved, thus extending the seal life and enabling real-time monitoring of its condition.

CN224515693UActive Publication Date: 2026-07-17XIAMEN XIAGONG CHINA RAILWAY HEAVY MACHINERY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
XIAMEN XIAGONG CHINA RAILWAY HEAVY MACHINERY CO LTD
Filing Date
2025-07-23
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing shield tunneling machine bearing seals are prone to failure due to abrasive intrusion in high-pressure mud and sand environments, resulting in short service life.

Method used

It adopts a combination structure of multi-layer lip seal, sealing ring, grease barrier and pressure sensor, combined with ball joint floating design to form dynamic oil film barrier, monitor the sealing status in real time and automatically compensate for lip wear.

Benefits of technology

Significantly improves seal life, reduces downtime maintenance frequency, ensures the sealing system can still work effectively under shaft eccentricity, and prevents abrasive intrusion.

✦ Generated by Eureka AI based on patent content.

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Abstract

本实用新型公开了一种盾构螺旋机用的轴承密封结构，属于盾构螺旋机技术领域，包括减速机与箱体，所述箱体的内侧设置有球铰，在球铰的内侧设置有驱动盘，在驱动盘的外侧且位于球铰的内侧设置有密封跑道，在密封跑道上设置有多组唇形密封，多组唇形密封均连接在球铰的内侧，每两组唇形密封之间设置有一组密封隔环，在球铰与驱动盘之间设置有轴承本体，本实用新型，通过设置的唇形密封+密封隔环+润滑脂屏障协同阻断磨粒侵入，能够极大的提升密封寿命；再通过设置的压力传感器实时监测密封状态，提前预知失效风险；然后通过设置的辅助弹簧自动补偿唇口磨损，减少停机维护频次；最后通过设置的球铰浮动结构使密封系统在轴偏心±2°时仍有效工作。
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Claims

1. A bearing seal structure for a shield jacking machine, comprising a reduction gear (1) and a housing (2), characterized in that: The inner side of the housing (2) is provided with a ball joint (5), the inner side of the ball joint (5) is provided with a drive disk (3), the reducer (1) is provided with a screw shaft (4), the outer side of the drive disk (3) and the inner side of the ball joint (5) is provided with a sealing track (6), multiple sets of lip seals (8) are provided on the sealing track (6), the multiple sets of lip seals (8) are all connected to the inner side of the ball joint (5), a sealing spacer (12) is provided between every two sets of lip seals (8), and a bearing body (14) is provided between the ball joint (5) and the drive disk (3).

2. The bearing seal structure for a shield jackscrew according to claim 1, characterized by: The housing (2) is provided with an input channel (9) and a monitoring cavity (10). A guide channel (11) is provided on the inner side of the ball joint (5). The input channel (9) is connected to the monitoring cavity (10), and the monitoring cavity (10) is connected to the guide channel (11). Two sealing cavities (15) are provided between the three sets of lip seals (8). The guide channel (11) is connected to the sealing cavity (15).

3. The bearing seal structure for a shield jackscrew according to claim 2, characterized by: A pressure sensor is installed inside the monitoring chamber (10).

4. The bearing seal structure for a shield jackscrew as set forth in claim 1, wherein: The lip seal (8) is provided with a plurality of auxiliary springs (16), one end of which is connected to the inside of the ball joint (5).

5. The bearing seal structure for a shield jacking screw according to claim 1, characterized in that: An air filter (7) is also provided on the housing (2), and a sealing ring (13) is also provided between the sealing ring (12) and the ball joint (5).