Active articulation device for earth pressure balance shield machine

Abstract

The invention discloses an active hinging apparatus for an earth pressure balance shield machine. The active hinging apparatus comprises a medium shield, a tail shield, a propelling hydraulic cylinder and a hinging hydraulic cylinder. A medium shield hinging ring sleeves a tail shield hinging ring, and a hinging sealing structure is arranged between the medium shield hinging ring and the tail shield hinging ring. The tail shield contact end surface, in contact with the medium shield, of the tail shield hinging ring and the medium shield contact end surface, corresponding to the tail shield contact end surface, of the medium shield are machining planes. A mechanical hinging zero position is formed when the distance between the tail shield contact end surface and the medium shield contact end surface is zero. According to the invention, the determination of the mechanical zero position is easy and practical, and the machining cost is not improved; an electrical measuring system zero position and the mechanical zero position can be accurately calibrated and the overlap of the electrical measuring system zero position and the mechanical zero position is facilitated; when a predetermined direction is set, the propelling can be guaranteed according to requirements, and the error correcting frequency can be reduced; the mechanical zero position and the electrical zero position can be calibrated again when a directional error occurs after the starting; deviating reasons can be more easily determined; the construction cost of error correcting parts can be saved; the accurate guiding control is facilitated; and the machining quality is improved.

Description

Technical field [0001] The invention relates to the technical field of shield machines, in particular to an active articulation device for earth pressure balance shield machines. Background technique [0002] The earth pressure balance shield machine is one of the main equipment for tunnel excavation. In order to ensure the correct direction of the tunnel and the need for correcting the direction error, the shield machine is equipped with a hinge device. Articulation devices are divided into active articulation and passive articulation. Among them, active articulation is the most used equipment for curved tunnel construction. [0003] In the existing active hinge structure, the middle shield 1 and the tail shield 3 are connected by a hinged hydraulic cylinder, and the middle shield is provided with a middle shield hinge ring 11, and the tail shield is provided with a tail shield hinge ring 31. The middle shield hinge ring 11 It is sleeved outside the hinged ring of the tail shield...

AI Technical Summary

Problems solved by technology

[0004] However, the above hinge structure has the following defects: 1. The contact end surface (distance A=0) of the middle shield hinge ring 11 and the tail shield hinge ring is a non-processed surface, that is, a rough surface. When the mechanical zero position is determined, due to the uneven gap between the contact surfaces, Sometimes the local gap is large, sometimes small, so that the dimension A is not a definite value; ②When determining the mechanical 0 position, because the dimension A cannot be taken as 0, the 0 position determined in the manufacturer is difficult to re-establish at the construction site. Return to the original position; ③After starting, if there is an error in the propulsion direction, the mechanical 0 position cannot be confirmed again; ④In order to eliminate the direction error, it can only be continuously deviated from the center line and manually corrected. What is the cause of the deviation? It is difficult to determine the problem of equipment or construction problem, which makes it impossible to solve the problem in time

[0005] Therefore, the above-mentioned structure does not have a clear reference for the active hinged mechanical 0-position, so when debugging, the debugging and calibration are based on the experience of the debugger and the tester to set the mechanical and electrical 0-position, so set the calibrated electrical 0-position and mechanical 0-position Relative error is unavoidable

However, the setting of electrical 0-bit error has many influences on tunnel construction: ① Tunnel design centerline: automatic deviation from the tunnel design centerline during straight construction; ② Curve construction: always deviation from the tunnel design curve error; ③. Always Continuous manual deviation correction affects the construction progress and tunnel penetration quality; ④. Increases the consumption of deviation correction related parts (such as profiling knives) and reduces the construction quality; ⑤. Relatively high requirements for the comprehensive quality of operators : Experience and wisdom are relatively high; ⑥. Electrical measurement data: low accuracy. Need to rely on manual review and detection for correction

[0006] To sum up, the existing actively articulated tunnel shield machine equipment generally has the uncertainty of the mechanical zero reference, which causes the equipment to automatically deviate from the design axis. There are many reasons for the deviation, but the uncertainty of the mechanical zero reference It will cause the offset and error of electrical 0-position calibration. The existence of this error will cause the completed tunnel to deviate from the design axis. In order to ensure that the tunnel direction error is controlled, manual intervention and deviation correction measures must be adopted, which will affect the progress and quality of the project.

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