Piston mechanism and spherical tooth hob with water jet assisted rock breaking function

Abstract

The invention discloses a piston mechanism and a spherical tooth hob with a water jet assisted rock breaking function. The piston mechanism comprises a piston cylinder, a piston and an elastic piece, the piston cylinder is of a hollow tubular structure, a sealing partition plate is arranged in the piston cylinder, and the interior of the piston cylinder is vertically divided into a movable cavity and a pressure cavity through the sealing partition plate; the piston penetrates through the sealing partition plate and is movably arranged in the piston cylinder, a limiting block is arranged at the end, protruding out of the pressure cavity, of the piston, the limiting block seals an opening of the pressure cavity in the natural state, and a piston probe is arranged at the position, located in the movable cavity, of the piston; and the elastic piece is arranged below the piston and abuts against the limiting block, and the piston probe always protrudes out of the opening of the movable cavity in the natural state under the action of the elastic piece. By means of the piston mechanism and the spherical tooth hob, water jet can be ejected from the peripheries of arranged spherical teeth, starting and stopping of the water jet are controlled through a pure mechanical structure, the reliability is high, abrasion of the spherical tooth hob can be reduced, and the rock breaking efficiency is improved.

Description

Technical field [0001] The present invention relates to a rock breaking ball hob technologies, and particularly to a mechanism and a piston having a water jet assisted rock function ball hob. Background technique [0002] Hard rock tunnel boring machine (in TBM) is a rock formation tunneling major equipment, which is the use of the hob cutter rotary cutting rock breaking extrusion. Cutters ball is used on the TBM cutter tool is based on constant cross section arranged in a circle on the hob tooth edge surface of the ball, during excavation is first pressed by a ball gear geotechnical pre-cut, and then by a subsequent rock cutting blade, often compared to the traditional rock breaking sectional hob cutter having improved rock breaking efficiency greater advantage. [0003] With TBM requirements in the field of hydraulic engineering, underground engineering, traffic engineering and other construction projects increasingly high performance TBM also put forward higher requirements. W...

AI Technical Summary

Problems solved by technology

However, since the water jet auxiliary rock-breaking device is installed on the cutter head, the distance between the impact point of the water jet and the hob is too large, and the joint rock-breaking effect is not ideal, and the opening and closing of the water jet is controlled by an external circuit through a valve, and the knife The working environment of the disc is very harsh, and the reliability of the valve is very high. These factors restrict the ability of the water jet to improve the rock-breaking performance of the hob.

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