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Hammer drilling device with a pneumatic reversing gear

A conversion control, impact technology, applied in drilling, drilling equipment, earth-moving drilling without stripping topsoil, etc., can solve problems such as high structure or technical cost, reduce the working efficiency of drilling rig, etc., to avoid the effect of axial movement

Inactive Publication Date: 2008-11-19
TRACTO TECHN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of these spring-pneumatic switching control mechanisms is that they require high structural or technical expenditure, and the working air from a unified air source is used for both the operation of the percussion piston and the switching control, which requires an interruption of the working air, which in turn requires Interruption of rig operation, or in the case of reduced pressure during changeovers, reduced rig performance is only acceptable

Method used

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  • Hammer drilling device with a pneumatic reversing gear
  • Hammer drilling device with a pneumatic reversing gear
  • Hammer drilling device with a pneumatic reversing gear

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Embodiment Construction

[0038] According to FIG. 1 , the percussion drill comprises a housing 1 in which a stop ring 2 with an axis-parallel exhaust channel 3 is arranged. A control line 4 is fixedly mounted in the housing 1 and supplies the working air via a torsionally rigid hose. The front end of the control tube 4 projects into a chamber 7 of an impact piston 8 provided with a control bore 6 .

[0039]Between the control tube 4 and the outer casing 9 of the piston chamber 7 there is an axially displaceable control sleeve 10 , which is movably mounted on an enlarged diameter portion 11 of the control tube 4 . The front end of the control tube 4 or the control tube widening 11 is provided with an outer flange 12 which covers the front face of the control sleeve 10 or ends flush with the control sleeve 10 ( FIG. 2 a ). In addition, some control holes 13 are provided on the front enlarged diameter portion 11 of the control pipe 4, as shown in Figs. 2 and 3, these control holes are covered by the con...

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Abstract

The invention relates to a hammer drilling device with a pneumatic reversing gear. Said device comprises a hammer piston (8) that is situated in a housing (1) and is displaced back and forth with the aid of air supplied via an air conduit (5), a control pipe (4, 36, 54) comprising at least one control opening (13), an outer pipe (15, 65) and a control sleeve (10, 60) that can be displaced by compressed air from a control chamber (16, 66). In said device, an essentially torsion-resistant air conduit (5) can be rotatably connected to a rotary valve (4, 40, 70) that supplies the control chamber with air or evacuates air from said chamber.

Description

technical field [0001] The invention relates to a percussion drill with a pneumatic conversion control mechanism ( ), especially for pit-free drilling in soil layers and for pit-free laying of underground pipes. Background technique [0002] Percussion drills of this type are also used for enlarging boreholes and for the destructive replacement of various pipes laid underground, and they all have an automatically controlled percussion piston that can be reciprocated in a housing by means of working air. The percussion piston transmits its kinetic energy to the housing at a front dead center position during forward travel and at a rear dead center position during backward travel. [0003] The conversion from forward operation to backward operation is implemented by means of a conversion control mechanism. The conversion control mechanism relies on the working air and the rearward movement of the rear dead center position ( ) in its front dead center position produces a b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B4/14
CPCE21B7/26E21B4/145
Inventor F-J·皮特曼G·巴尔弗
Owner TRACTO TECHN