Rock drilling arrangement and machine

Patent metadata

Field	Value
Publication number	US-12005558-B2
Application number	US-202017436732-A
Country	US
Kind code	B2
Filing date	Mar 16, 2020
Priority date	Mar 14, 2019
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

A rock drilling arrangement includes an impact device having a frame, pressure chambers in the frame, and a piston arranged in the impact device. The arrangement further includes a rear mounting arrangement for attaching the impact device to a carriage, a front mounting arrangement for attaching the impact device to a machine component, at least one fore pressure accumulator arranged on a front side of the rear mounting arrangement in an axial direction of the piston, and at least one rear pressure accumulator arranged on a back side of the rear mounting arrangement. The fore pressure accumulator and the rear pressure accumulator are connected to one of the pressure chambers and arranged to absorb pressure fluctuations in the pressure chambers.

First claim

The invention claimed is:

1. A rock drilling arrangement comprising:
an impact device including a frame, a plurality of pressure chambers in the frame, and a piston arranged in the impact device;
a rear mounting arrangement arranged for attaching the impact device to a carriage, the rear mounting arrangement having a front side and a back side and including two fastening lugs having a through hole as a mounting hole and arranged perpendicular in relation to an axial direction of the piston;
a front mounting arrangement arranged for attaching the impact device to a machine component;
at least one fore pressure accumulator arranged on the front side of the rear mounting arrangement in the axial direction of the piston; and
at least one rear pressure accumulator arranged on back side of the rear mounting arrangement, the at least one fore pressure accumulator and the at least one rear pressure accumulator being connected to one of the plurality of pressure chambers and arranged to absorb pressure fluctuations in the plurality of pressure chambers.

2. The arrangement as claimed in claim 1 , wherein the at least one fore pressure accumulator comprises at least two fore pressure accumulators.

3. The arrangement as claimed in claim 1 , wherein the at least one fore pressure accumulator comprises four fore pressure accumulators.

4. The arrangement as claimed in claim 1 , wherein the at least one rear pressure accumulator comprises at least two rear pressure accumulators.

5. The arrangement as claimed in claim 1 , wherein the at least one fore accumulator comprises a plurality of fore pressure accumulators, at least one of the fore pressure accumulators being a high pressure accumulator having a pre-charge pressure in the range of 50-150 bar.

6. The arrangement as claimed in claim 5 , wherein each of the plurality of fore pressure accumulators is a high pressure accumulator.

7. The arrangement as claimed in claim 1 , wherein the at least one rear accumulator comprises a plurality of rear pressure accumulators, at least one of the plurality of rear pressure accumulators is a low pressure having a pre-charge pressure in the range of 1-5 bar.

8. The arrangement as claimed in claim 7 , wherein each of the plurality of rear pressure accumulators is a low pressure accumulator.

9. The arrangement as claimed in claim 1 , wherein the at least one fore and at least one rear pressure accumulator is arranged on a side of the frame.

10. The arrangement as claimed in claim 1 , wherein at least one of the at least one fore pressure accumulator and the at least one rear pressure accumulator is arranged on a top of the frame.

11. The arrangement as claimed in claim 1 , wherein the at least one fore accumulator and the at least one rear accumulator comprise two low pressure accumulators arranged at different positions in the axial direction of the piston.

12. A rock drilling machine comprising a drilling arrangement according to claim 1 .

Assignees

• Sandvik Mining & Construction Oy

Inventors

• Koskimaki Antti
• Hamalainen Mikko
• Viinikka Matti

Classifications

• E21B4/14 Primary

  Fluid operated hammers · CPC title

• B25D2250/051

  Couplings, e.g. special connections between components · CPC title

• B25D9/145

  for hydraulically actuated hammers having an accumulator · CPC title

• B25D17/00

  Details of, or accessories for, portable power-driven percussive tools {(details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00)} · CPC title

• B25D17/28 Primary

  Supports; Devices for holding power-driven percussive tools in working position {(connections of hammers to backhoes E02F3/966)} · CPC title