Hobbing cutter with function of adjusting inner cavity pressure balance of bearing

Abstract

The invention relates to the technical field of shield machines, in particular to a hobbing cutter with the function of adjusting the inner cavity pressure balance of a bearing. The hobbing cutter comprises a cutter body, a cutter shaft, a cutter ring, the bearing, an end cover and a floating seal device; the cutter shaft is installed in the cutter body through the bearing, the end cover and the floating seal device are installed at the two ends of the cutter body in a matched mode, the cutter ring is installed on the outer ring of the cutter body, and the cutter shaft is provided with a pressure balancing device which is communicated with an inner cavity of the bearing; the pressure balancing device comprises an oil hole drilled in the cutter body and a protective cover, a pressure transmitting bag is arranged in the oil hole, the protective cover fixedly and tightly presses the pressure transmitting bag, and the oil hole is communicated with the inner cavity of the bearing through a first pressure transmitting hole. According to the hobbing cutter, the structure is simple, the pressure balancing device is additionally arranged in an existing cutter structure and arranged on the cutter shaft, space is not occupied, the effectiveness of the bearing is guaranteed, and the effective service life of the cutter is prolonged.

Description

technical field [0001] The invention relates to the technical field of shield machines, in particular to a hob capable of adjusting the pressure balance of a bearing inner cavity. Background technique [0002] The hob is a tool commonly used in the work of shield machines and TBMs. The bearing inner cavity of the currently used hob is a closed system, which is filled with lubricating grease, and the sealing is completed by two pairs of floating seals. Due to the temperature rise of the inner cavity of the tool and the pressure change of the external environment during work, when the pressure difference between the two ends of the seal exceeds the critical value of the floating seal, grease leakage or debris such as mud and debris will enter the inner cavity of the bearing, too little grease and debris Ingress will reduce the life of the bearing, damage the tool in advance, and cause the occurrence of partial wear of the tool. Contents of the invention [0003] The object...

AI Technical Summary

Problems solved by technology

Due to the temperature rise of the inner cavity of the tool and the pressure change of the external environment during work, when the pressure difference between the two ends of the seal exceeds the critical value of the floating seal, grease leakage or debris such as mud and rocks will enter the inner cavity of the bearing, too little grease and debris Entry will reduce the life of the bearing, damage the tool in advance, and cause the occurrence of partial wear of the tool

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