Device and method in respect of a rock drill rig, drill string component, handling device and rock drill rig

1. A tensioning device for a chain transmission for movement transfer between a driver device and a slide to be driven by a drive chain along a linear guide of a rock drill rig, the tensioning device comprising:

a tensioning head arranged on the slide and being displaceable in relation to the slide in a tension direction of the drive chain,

a first fastening member for fastening a first end of the drive chain on the slide,

a second fastening member for fastening a second end of the drive chain on the tensioning head,

a spring device arranged between the tensioning head and the slide for spring loading the tensioning head in the tension direction,

a tension adjuster included with at least one of said first and second fastening members, wherein the tension adjuster is for adjusting tension in the drive chain, and

a slide guide provided on the slide and on which the tensioning head moves in relation to the slide, wherein the slide guide is oriented in said tension direction, and wherein the slide guide includes two parallel slide rods which pass through bushings being received in the tensioning head.

2. The device according to claim 1 , wherein the spring device includes a pressure spring package arranged around each slide rod.

3. The device according to claim 1 , further comprising:

a movement limiter arranged between the tensioning head and the slide for preventing compression of the spring device.

4. The device according to claim 1 , further comprising:

an indirect chain tension sensor arranged to sense a relative position between the slide and the tensioning head.

5. The device according to claim 4 , wherein the chain tension sensor is a sensor from the group: an inductive sensor, a capacitive sensor, a mechanical sensor, a Hall sensor, or an optical sensor.

6. The device according to claim 4 , wherein the chain tension sensor is positioned on the slide, the device further comprising:

a detectable element intended for detection positioned on the tensioning head.

7. The device according to claim 4 , further comprising:

a safety brake fastened on the slide, said safety brake in case of chain tension below a determined level being arranged to brake the slide through braking engagement with a brake surface extending along the linear guide.

8. The device according to claim 7 , wherein the safety brake is a hydro-mechanical normally locked clamping brake, and wherein the brake surface is arranged on an elongate brake beam being arranged adjacent to the linear guide.

9. A handling device for handling drill string components in a rock drill rig, the handling device comprising:

a linear guide,

a slide,

a chain transmission configured to displace the slide,

a gripping device for drill string components being positioned on the slide, and

a tensioning device comprising

a tensioning head arranged on the slide and being displaceable in relation to the slide in a tension direction of the drive chain,

a first fastening member for fastening a first end of the drive chain on the slide,

a second fastening member for fastening a second end of the drive chain on the tensioning head,

a spring device arranged between the tensioning head and the slide for spring loading the tensioning head in the tension direction,

a tension adjuster included with at least one of said first and second fastening members, wherein the tension adjuster is for adjusting tension in the drive chain, and

a slide guide provided on the slide and on which the tensioning head moves in relation to the slide, wherein the slide guide is oriented in said tension direction, and wherein the slide guide includes two parallel slide rods which pass through bushings being received in the tensioning head.

10. A rock drill rig, comprising:

a linear guide comprising a feed beam

a slide,

a chain transmission configured to displace the slide,

a rock drilling machine positioned on the slide, and

a tensioning device comprising

a tensioning head arranged on the slide and being displaceable in relation to the slide in a tension direction of the drive chain,

a first fastening member for fastening a first end of the drive chain on the slide,

a second fastening member for fastening a second end of the drive chain on the tensioning head,

a spring device arranged between the tensioning head and the slide for spring loading the tensioning head in the tension direction,

a tension adjuster included with at least one of said first and second fastening members, wherein the tension adjuster is for adjusting tension in the drive chain, and

a slide guide provided on the slide and on which the tensioning head moves in relation to the slide, wherein the slide guide is oriented in said tension direction, and wherein the slide guide includes two parallel slide rods which pass through bushings being received in the tensioning head.