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An impact mechanism, rock drill and drill rig comprising such impact mechanism

A technology of impact mechanism and stroke, used in impact drilling, reciprocating drilling rigs, portable impact tools, etc.

Active Publication Date: 2014-01-01
EPIROC ROCK DRILLS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of adjusting stroke length utilizing existing technology

Method used

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  • An impact mechanism, rock drill and drill rig comprising such impact mechanism
  • An impact mechanism, rock drill and drill rig comprising such impact mechanism
  • An impact mechanism, rock drill and drill rig comprising such impact mechanism

Examples

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Embodiment Construction

[0015] Figure 1a to Figure 1d It schematically shows a hydraulic down-the-hole hammer drill arranged in a housing in the prior art, and the hammer drill has an alternating pressure type hammer mechanism. The impact mechanism comprises a pneumatic hammer piston 1 which moves forward and backward and impacts on a shank adapter 2 or the like. The shank adapter 2 then transfers the impact energy to the rock through the drill string (not shown in the figures) and the drill bit (not shown in the figures).

[0016] The front end 3 of the jackhammer piston is here the end of the impact shank adapter 2 , while the rear end 4 of the jackhammer piston is the end oriented away from the shank adapter 2 . The pneumatic hammer piston 1 in this example comprises a front piston boom 5 with a front drive area 6 and a rear piston boom 7 with a rear drive area 8 . Forward and backward movement is controlled by means of a valve piston 9 and several channels. The inclusion of accumulator 25 and ...

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PUM

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Abstract

The invention relates to an impact mechanism comprising a housing (32) with at least two stroke adjustment channels (18, 19, 20); an adjustment arrangement (31) with at least two adjustment pin channels (35, 36, 37, 135, 136, 137) arranged to interact in a manner that can be selected with the stroke adjustment channels (18, 19, 20); and a hammer piston (1) that performs reciprocating motion in the housing (32) in order to impact repetitively onto an anvil (2), which hammer piston (1 ) has a stroke length that can be selected with the aid of adjustment pin channels (35, 36, 37, 135, 136, 137) and the stroke adjustment channels (18, 19, 20). According to the invention, the adjustment arrangement (31 ) comprises an elastic element (48) arranged to maintain the adjustment arrangement (31) in place for the stroke length that has been selected; and an operating means (34) arranged to select adjustment pin channel (35, 36, 37, 135, 136, 137) and thus the stroke length of the hammer piston (1).

Description

technical field [0001] The invention relates to a percussion mechanism according to the preamble of claim 1 . Background technique [0002] In rock drills and other hydraulic impact mechanisms, a hammer piston performs a reciprocating motion within a cylindrical housing and repeatedly impacts against a shank adapter or other type of anvil. The length of the stroke is the distance traveled by the hammer piston between the positions it is in when the hammer piston changes its direction of motion. The stroke length can be controlled by means of a stroke adjustment device, for example in the form of a stroke adjustment pin, in such a way that the adjustment of the adjustment device selects between different channels or combinations of channels, which adjustment affects, for example, the pneumatic hammer piston in the rear position The position at which to change the direction of its motion. In this way the energy and frequency of the impacts are influenced. [0003] There are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25D9/26E21B1/26
CPCE21B4/14B25D2250/371B25D9/26E21B1/12
Inventor 乌尔夫·尼尔松
Owner EPIROC ROCK DRILLS AB
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