Breaking device

Patent metadata

Field	Value
Publication number	US-9981370-B2
Application number	US-201514789618-A
Country	US
Kind code	B2
Filing date	Jul 1, 2015
Priority date	Jul 3, 2014
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

A breaking device includes a frame, an impact device having a pressure chamber with a rear pressure chamber and a front pressure chamber. The breaking device further includes a first low pressure port at the rear pressure chamber, a first low pressure channel and a first low pressure accumulator connected to the first low pressure channel. The breaking device further includes a second low pressure port at the rear pressure chamber substantially opposite to the first low pressure port, second low pressure channel and a second low pressure accumulator connected to the second low pressure channel. The first low pressure accumulator and the second low pressure accumulator are arranged at the outer circumference of the frame of the breaking device at different positions in the axial direction of the breaking device.

First claim

The invention claimed is:

1. A breaking device comprising:
a frame;
an impact device including a pressure chamber and a percussion piston arranged to divide the pressure chamber into a rear pressure chamber and a front pressure chamber;
at least one first pressure port in the frame at the rear pressure chamber and at least one first pressure channel extending from the at least one first pressure port to an outer circumference of the frame of the breaking device;
at least one first pressure accumulator connected to the at least one first pressure channel at the outer circumference of the frame;
at least one second pressure port in the frame at the rear pressure chamber radially opposite from the at least one first pressure port;
at least one second pressure channel extending from the at least one second pressure port to the outer circumference of the frame;
at least one second pressure accumulator connected to the at least one second pressure channel at the outer circumference of the frame, wherein the at least one second low pressure channel is arranged to extend at least partly in an axial direction of the breaking device, whereby the at least one first pressure accumulator and at least one second pressure accumulator are arranged at the outer circumference of the frame at different positions in the axial direction of the breaking device;
at least one third pressure port in the frame at the front pressure chamber and at least one third pressure channel extending from the at least one third pressure port to the outer circumference of the frame, at least one third pressure accumulator connected to the at least one third pressure channel at the outer circumference of the frame; and
at least one fourth pressure port in the frame at the rear pressure chamber and at least one fourth pressure channel extending from the at least one fourth pressure port to the outer circumference of the frame, and at least one fourth pressure accumulator connected to the at least one fourth pressure channel at the outer circumference of the frame, wherein the at least one third pressure channel and the at least one fourth pressure channel are arranged to extend substantially in the radial direction of the frame from the at least one third pressure port and from the at least one fourth pressure port to the outer circumference of the frame, the at least one third pressure accumulator being positioned at the front pressure chamber and the at least one fourth pressure accumulator being positioned at the rear pressure chamber.

2. The breaking device as claimed in claim 1 , wherein the at least one second pressure channel is arranged to extend in the axial direction of the breaking device from the at least one second pressure port-towards the front pressure chamber, the at least one first pressure accumulator and at least one second pressure accumulator being arranged at the outer circumference of the frame of the breaking device at substantially opposite positions in the radial direction of the frame of the breaking device.

3. The breaking device as claimed in claim 1 , wherein the at least one first pressure channel is arranged to extend substantially in a radial direction of the frame of the breaking device from the at least one first pressure port to the outer circumference of the frame of the breaking device and the at least one second pressure channel is arranged to extend at a position of the front pressure chamber, the at least one first pressure accumulator being positioned at the rear pressure chamber and the at least one second pressure accumulator being positioned at the front pressure chamber.

4. The breaking device as claimed in claim 1 , wherein the at least one third pressure port and the at least one fourth pressure port are arranged at substantially opposite positions in the radial direction of the frame of the breaking device.

5. The breaking device as claimed in claim 2 , wherein in the axial direction of the breaking device, the at least one first pressure accumulator and the at least one second pressure accumulator, as well as the at least one third pressure accumulator and the at least one fourth pressure accumulator are positioned mutually crosswise at substantially opposite positions in the radial direction of the frame of the breaking device.

6. The breaking device as claimed in claim 1 , wherein the impact device includes at least one control valve contributing to divide the pressure chamber into the rear pressure chamber and the front pressure chamber, the at least one control valve having a number of openings for controlling the flow of pressure medium in the rear pressure chamber through the pressure ports.

7. The breaking device as claimed in claim 6 , wherein the control valve is positioned between the percussion piston and a stationary cylinder having openings, the control valve being arranged to move with respect to the cylinder for controlling the flow of the pressure medium through the valve and cylinder openings and thereby through the ports for controlling the pressures in the rear pressure chamber.

8. The breaking device as claimed in claim 1 , wherein the breaking device is a rock drilling machine.

9. The breaking device of claim 1 , wherein the pressure of the first and second pressure accumulators is lower than the pressure of the third and fourth pressure accumulators.

Assignees

• Sandvik Mining & Construction Oy

Inventors

• Kela Timo
• Muuttonen Timo
• Koskimaki Antti

Classifications

• B25D9/20

  involving a tubular-type slide valve · CPC title

• E21B7/025

  Rock drills, i.e. jumbo drills · CPC title

• B25D2250/275

  Tools having at least two similar components · CPC title

• B25D9/12

  comprising a built-in liquid motor {, i.e. the tool being driven by hydraulic pressure} · CPC title

• E21B1/02

  Surface drives for drop hammers {or percussion drilling}, e.g. with a cable · CPC title