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Hydraulic rotary-percussive hammer drill

A technology of hydraulic rotary and percussion drill, applied in the field of hydraulic rotary percussion drill, can solve problems such as damage

Inactive Publication Date: 2007-08-29
MONTABERT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the operator closes the main supply circuit and, for example, only starts the rotary motor, the surface abutting the piston is no longer supplied with rear hydraulic fluid, so the piston does not come into direct contact with the body of the hammer drill, which would wreak havoc

Method used

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  • Hydraulic rotary-percussive hammer drill
  • Hydraulic rotary-percussive hammer drill
  • Hydraulic rotary-percussive hammer drill

Examples

Experimental program
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Embodiment Construction

[0019] 1-3, the impact drill 1 of the present invention has a body 2, the body 2 includes a chamber 3, the chamber extends to the rear to form a cylinder 31, the cylinder contains an impact piston 4. More specifically, the chamber 3 houses a substantially annular abutment piston 5 , which can slide around the percussion piston 4 , an annular sleeve 6 , a drill shank 7 and a rotary motor 8 .

[0020] The adjoining piston 5 has a front part, an intermediate shoulder 12 comprising a front annular surface 25 and a rear annular surface 26 , and a rear part. At its front and at its rear, the adjoining piston has a front face 13 and a rear face 14, respectively. More specifically, the front surface 13 is in contact with the drill rod 7 and the rear surface 14 faces the rear wall 15 of the chamber 3 . The sleeve 6 is fitted behind the abutting piston 5 and can slide sealingly along the latter. Furthermore, the front portion of the adjoining piston 5 , the front surface 25 of the int...

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PUM

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Abstract

The invention relates to a hydraulic rotary-percussive hammer drill comprising a body containing an alternating impact piston (4) which slides due to the effect of a main hydraulic feed circuit (22), said main circuit also being intended to cause an essentially annular stop piston (5) to slide in a cavity (3) of the body. The aforementioned stop piston comprises a front face which is in contact with a shank (7) and which is intended to position said shank at a pre-determined distance from the impact piston and a rear face opposite a rear wall of the cavity. The invention is characterised in that, when the main circuit is stopped, an external hydraulic feed circuit (23) can introduce a pressurised fluid between the rear face of the stop piston and the rear wall of the cavity, such as to maintain a space between same. The inventive hammer drill is suitable for drilling installations.

Description

technical field [0001] The invention relates to a hydraulic rotary percussion drill, in particular to a percussion drill used on a drilling device. Background technique [0002] A drilling apparatus includes a hydraulic rotary percussion drill that slides on a drilling jar and drives one or more drill rods, the last of which supports a tool, such as a drill bit, that The drill bit makes contact with the rock. Such percussion drills are generally used to drill relatively deep holes so that explosives can be kept in the hole. The percussion drill is therefore the main element which, on the one hand, rotates the drill bit and exerts an impact force through the drill rod in order to penetrate the rock, and on the other hand, supplies an injection fluid to squeeze out the debris in the drilled hole. [0003] A percussion drill includes a mechanism driven by the flow of one or more hydraulic fluids from the main supply circuit of the percussion device, the hydraulic fluid is app...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25D17/24B25D16/00B25D9/12E21B6/00
CPCB25D17/245B25D9/12E21B6/00B25D16/00B25D17/24
Inventor 让·西尔万·科马尔蒙
Owner MONTABERT SA