Three teeth roller bit for mining

Abstract

The invention relates to a drill, which is a 3-gear-wheel drill for drilling in mines or for gas well drilling, and comprises a head section and gear wheels. On the head section, a long air hole and a bearing are arranged. On the long air hole, a ballast-stopping pipe is provided. Between the journal of the head section and the gear wheel, a sealing is provided. The upper end of the long air hole is provided with a sealing membrane. Any grease can be sealedly stored in the bearing cavity and the long air hole of the 3-gear-wheel drill for mines. Comparing with the not-sealed no-lubrication bearing structure in prior 3-gear-wheel mining drill, the invention can lubricate well the bearing in given time, when the sealing fails and the grease is used off, the 3-gear-wheel mining drill will continue to work as usual. As some lubrication time is added, comparing with prior 3-gear-wheel mining drill, the invention can improve the comprehensive indexes of the drill 15-20%.

Description

technical field

[0001] The invention relates to a drill bit for mine drilling and air drilling, in particular to a three-cone drill bit for mining. Background technique

[0002] Mine drilling mostly uses tri-cone bits. Due to the harsh working environment of mining tri-cone bits, the service life is generally short. According to the inventor's investigation, more than 80% of the damage of the traditional mining tri-cone bit is caused by the damage of its bearing. bearing structure. Such as figure 1 Shown is a schematic diagram of the structure of a traditional mining tri-cone bit, including the tooth palm 1, the cone 2, the journal 3, the long air hole 4, the air hole 5, and the ballast retaining pipe 6, and the compressed gas passes through the long air hole 4 and the air hole 5 To cool the bearing, the long air hole 4 communicates with the air hole 5, even if a lubricant such as grease is injected, it will leak quickly, and it is impossible to lubricate the bearing with...

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