Percussion device, drilling machine including such a percussion device and method for controlling such a percussion device

A technology of impact device and control valve, applied in drilling equipment and methods, impact drilling, automatic control system of drilling, etc. The effect of fast and small reflections

Active Publication Date: 2009-08-05
EPIROC ROCK DRILLS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Known rigs function well, but it is not possible to easily control the axial rotational position of the percussion piston

Method used

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  • Percussion device, drilling machine including such a percussion device and method for controlling such a percussion device
  • Percussion device, drilling machine including such a percussion device and method for controlling such a percussion device
  • Percussion device, drilling machine including such a percussion device and method for controlling such a percussion device

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Experimental program
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Embodiment Construction

[0020] figure 1 A part of a rock drilling machine 1 comprising a percussion device with a percussion piston 2 is shown. Reference number 5 denotes a valve for switching the pressure medium for driving the percussion piston. also includes centering unit 6 and the figure 1 Rotary unit, damping unit and so on not shown in the. The percussion piston 2 reciprocates inside the machine housing 3 .

[0021] In the machine housing 3, in the area of ​​the impact piston shoulder 8, several control channels 10-13 are arranged such that their channel openings are mutually opposite to the first edge 14 of the impact piston shoulder 8. cooperation. The dashed line at reference numeral 14' indicates the position of the first edge 14 when the percussion piston is retracted after the stroke so that the opening to the control passage 10 is opened.

[0022] The pressurizable chamber 4 receives a drive surface on the percussion piston in the form of a drive flank of a percussion piston should...

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Abstract

A percussive device including, inside a machine housing (3), a reciprocally moveable percussive piston (2), the movement of which being controllable through a control valve (5), which is arranged to alternatively connect a chamber to a pressure source and to low pressure in dependence of a signal describing the axial position of the percussive piston, wherein valve means (16) are arranged to allow adjustment of in which axial position of the percussive piston said signal is transmitted, through respectively opening and blocking of connection between one or a plural of said control channels (10,11,12,13) and the control valve. The invention also concerns a rock drilling machine and a method.

Description

technical field [0001] The invention relates to a percussion device according to the preamble of claim 1 . The invention also relates to a rock drilling machine comprising such a percussion device. Background technique [0002] EP-0 080 446 (Atlas Copco AB) discloses a rock drilling machine in which the feed force is transmitted from the housing to the drill string or via a damper to the drill string adapter. The damper yields under the action of the reflected compression shock wave, which yield is detected and used to control a control pin which adjusts the stroke length of the percussion piston such that the reflected shock wave energy is minimized. [0003] In particular, the control pin is an adjusting device for adjusting at what axial position the percussion piston transmits a pressure signal to the reciprocating valve body, wherein the device is arranged to control the control pin in response to the pressure signal, In order to change the operation of the shock devi...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B25D9/16E21B1/26B25D9/18
CPCB25D9/16B25D2250/005B25D9/26E21C3/24E21B6/08E21B44/08E21B7/025Y10T137/86582Y10T137/8663
InventorP·比拉特
OwnerEPIROC ROCK DRILLS AB