Seal structure of main shaft of excavating equipment

Abstract

The invention discloses a seal structure of a main shaft of excavating equipment, which comprises a cover-shaped connecting transitional sleeve covering at the end part of the main shaft. The cover-shaped connecting transitional sleeve is connected with the main shaft and a cutter through bolts; a cylindrical connecting basal body is sheathed onto a main shaft driving device, and is connected with the main shaft driving device through bolts; the other end of the cylindrical connecting basal body is provided with a seal erection loop in the manner of butt joint; both sides of the seal erection loop are respectively provided with a front gland and a rear gland; the seal erection loop, the front gland and the rear gland jointly define a seal annular cavity at the outer side of the connecting transitional sleeve; a seal element is arranged in the annular cavity; both sides of the seal erection loop are respectively provided with a seal ring; when the seal element needs to be replaced after being abraded, the main shaft and the main shaft driving device are entirely removed, and then, the rear gland is detached, thus, the seal element can be replaced at any time. Moreover, when the main shaft and the main shaft driving device are entirely separated from the excavating equipment, the seal structure of the main shaft cannot be damaged, the sealing performance of the excavating equipment is ensured to be normal, and the pressure stability of a working face is kept.

Description

Technical field [0001] The invention relates to a sealing structure of a tunneling equipment, in particular to a main shaft sealing structure of the tunneling equipment. Background technique [0002] With the development of the national economy and urban construction, as the main equipment for trenchless pipeline construction, small tunneling equipment is widely used in infrastructure construction such as urban water supply and drainage, gas pipelines, power tunnels, communication cables, and circulating water pipelines for power plants. And during the construction of transportation such as highway, railway, tunnel excavation. [0003] The pipe jacking machine is a commonly used small tunneling equipment. During the underground construction process, the pipe jacking machine drives the cutter head to rotate through the spindle to cut the soil. The pipe jacking machine digs into the soil under the action of the main jack thrust. The excavated soil is discharged by the mud pipe, and ...

AI Technical Summary

Problems solved by technology

like figure 2 , because the seal installation ring 4` and the gland 8` can only be removed after separating the cutter head 7`, loosen the screws from the outside of the pipe jacking machine, and then remove the seal 1`, and the outer side of the seal installation ring 6` is in contact with the machine body Welding fixation cannot be removed

During the pipe jacking construction process, the pipe jacking machine cannot retreat, and the main shaft 2` cannot be separated from the cutter head 7`, which makes it difficult to remove the seal 1` from the overall structure, especially during the construction process. The outside of the pipe jacking machine is filled with mud and liquid , the seal installation ring 4` cannot be removed and the seal 1` cannot be replaced. Since the seal structure here is often worn during construction, it may cause the risk of damage to the seal and cannot be replaced, so that the construction cannot continue. By excavating a shaft on the ground, the entire excavation equipment is taken out to replace the seal, which will greatly increase the cost and delay the construction period

[0007] In addition, during the pipe jacking construction process, when the main shaft driving parts are damaged and repaired, according to the current main shaft sealing structure, the seal is installed on the main shaft, and the removal of the main shaft will destroy the sealing structure and destroy the inside of the pipe jacking machine body and the working surface. In the isolated state, the soil and water on the working face directly enter the excavation equipment, causing a lot of trouble for later cleaning. The main reason is that the pressure on the working face cannot be kept stable. If the pressure on the working face is unbalanced, it will cause the risk of ground subsidence

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