A cradle arrangement for a rock drilling arrangement, and a rock drilling and bolting arrangement

Abstract

A cradle arrangement (1) for a rock drilling arrangement (60) includes a cradle (2) and a tool holder (3), releasably attached to the cradle (2) One of the cradle (2) and the tool holder (3) comprises a first part (4) and a second part (5), in which the first part (4) is movable in relation to the second part (5) in a first direction when the tool holder (3) is attached to the cradle (2). The cradle arrangement (1) includes a linear actuator (6) for displacing the first part (4) in relation to the second part (5) in said first direction when the tool holder (3) is attached to the cradle (2). The first part (4) o has a bevelled first surface (7) extending at an inclination angle and arranged to engage with a corresponding bevelled first surface (8) of the other of the cradle (2) and the tool holder (3) when the first part (4) is in a first position (P1). The second part (5) of one of the cradle (2) and the tool holder (3) has a bevelled second surface (9) extending at an inclination angle relative to said first direction and arranged to engage with a corresponding bevelled second surface (10) of the other of the cradle (2) and the tool holder (3) when the second part (5) is in a first position (P2).

Description

[0001] A cradle arrangement for a rock drilling arrangement, and a rock drilling and bolting arrangement

[0002] TECHNICAL FIELD

[0003] The present disclosure generally relates to a cradle arrangement for a rock drilling arrangement.

[0004] BACKGROUND

[0005] Generally, a rock drilling machine is used for mining procedures. The rock drilling machine comprises a rock drilling arrangement positioned on a feeder beam arranged to carry tools for operation at a drill site. The feeder beam may be attached to the rock drilling machine by means of booms.

[0006] The rock drilling arrangement comprises multiple tools for executing multiple operations during mining procedures. For example, some available rock drilling arrangement comprises a drilling unit and a bolting unit which may be used for drilling operation as well as for bolting operation consecutively. Conventional rock drilling arrangement comprises means for automatic switching between the drilling unit and the bolting unit. One such means may include a cradle arrangement configured to position the drilling unit and the bolting unit. The cradle arrangement may include one or more of top cradles and a bottom cradle. The top cradles, which may also be referred to as tool holders, are configured to hold a drilling unit or bolting unit. Further, the bottom cradle is supported by the feeder beam, relative to which said bottom cradle is displaceable in the longitudinal direction of the feeder beam.

[0007] Furthermore, in available rock drilling arrangements, the top cradles are configured to alternatively assist drilling unit or bolting unit in operative engagement and in a locked position with the bottom cradle to provide a safe drilling and bolting operation through the respective drilling and bolting unit. A locking and unlocking means is used for locking and unlocking the top cradle with the bottom cradle. In some prior art, the locking and unlocking means may comprise hydraulically, pneumatically, or electrically controlled, axially displaceable locking pins that are adapted to be inserted into a locking hole during locking of the top cradle with the bottom cradle.

[0008] However, the disadvantage of such an available solution is that the aforementioned locking pins may fail to provide stability to the locking and unlocking means of the cradle arrangement. In addition, the pins may deteriorate due to impact of high forces by the drilling unit and the bolting unit during operation of the rock drilling arrangement. Therefore, such use of pins during the locking and unlocking of the top cradle with the bottom cradle may require extra maintenance and surveillance while using the rock drilling arrangement.

[0009] SUMMARY

[0010] Consequently, it is an object of the present disclosure to present a cradle arrangement for a rock drilling arrangement and a rock drilling and bolting arrangement that overcomes the above identified problems and disadvantages and provides an improved cradle arrangement.

[0011] According to a first aspect of the present disclosure, a cradle arrangement for a rock drilling arrangement is provided. The cradle arrangement comprises a cradle and a tool holder, releasably attached to the cradle. One of the cradle and the tool holder includes a first part and a second part. The first part is movable in relation to the second part in a first direction when the tool holder is attached to the cradle. Further, the cradle arrangement comprises a linear actuator for displacing the first part in relation to the second part in said first direction when the tool holder is attached to the cradle. The first part of one of the cradle and the tool holder has a bevelled first surface extending at an inclination angle with regard to said first direction and arranged to engage with a corresponding bevelled first surface of the other of the cradle and the tool holder when the first part is in a first position. Further, the second part of one of the cradle and the tool holder has a bevelled second surface extending at an inclination angle relative to said first direction and arranged to engage with a corresponding bevelled second surface of the other of the cradle and the tool holder when the second part is in a first position. The tool holder movement is blocked relative to the cradle in a second direction perpendicular to the first direction when the first part is in its first position and the second part is in its first position. Further, the tool holder movement is enabled relative to the cradle in said second direction when the first part is in its second position and the second part is in its second position.

[0012] Advantageously, in their respective first positions, the bevelled first surface of the first part of one of the cradle and the tool holder and the corresponding bevelled first surface of the other of the cradle and the tool holder, and the bevelled second surface of the second part and the corresponding bevelled surface with which it is in engagement, provides a rigid clamping effect between the cradle and the tool holder. The rigid clamping effect enables reliable and efficient locking and unlocking of the tool holder and the cradle of the cradle arrangement. Hence, providing an improved stability to the cradle arrangement.

[0013] In some embodiments, the linear actuator is arranged to move the first part to a second position in which its bevelled first surface is disengaged from said corresponding bevelled first surface of the other of the cradle and the tool holder. Further, the linear actuator is arranged to move the second part to a second position in which its bevelled second surface is disengaged from said corresponding bevelled second surface of the other of the cradle and the tool holder.

[0014] The first position corresponds to a locked configuration and the second position corresponds an unlocked configuration of the cradle and the tool holder, enabling removal of the tool holder from the cradle and exchange of tool holder, preferably for changing between a tool holder carrying drill equipment to a tool holder carrying bolting equipment and vice versa.

[0015] In order to enable the linear actuator to move both the first and the second parts from and to their respective first and second positions merely by moving the first part in relation to the second part, an abutment member should be provided on a member which is static in relation to the tool holder. In an example, the abutment member is provided on the other of the cradle and the tool holder, wherein upon engagement of the abutment member and one of the first and second part, the abutment member prevents further motion of that part in a direction parallel to the first direction, such that further relative motion between the first and second part caused by the linear actuator results in the displacement of the other part in relation to the other of the cradle and the tool holder in a direction opposite to the first direction, such that also that other part is displaced in relation to the other of the cradle and the tool holder.

[0016] The cradle and the tool holder present bearing surfaces on which they bear against each other when the tool holder is attached to the cradle and along which the tool holder is arranged to slide along the cradle. The bearing surfaces, and the sliding direction are parallel to the first direction when the tool holder is attached to the cradle.

[0017] In some embodiments, the tool holder has a width in a third direction, which is perpendicular to said first direction and to said second direction, wherein the bevelled first surface of the first part extends in said third direction along at least half the width of the first part. Thereby, stable clamping between tool holder and cradle is achieved. Preferably, for the same technical reason, also the bevelled second surface of the second part extends in said third direction along at least half the width of the second part.

[0018] In some embodiments, the bevelled first surface of the first part extends with an angle a in the range of 30°-75° with regard to the first direction. Preferably, the bevelled first surface of the first part extends with an angle a in the range of 35°-55° with regard to the first direction. In an example, the angle a may extend between a base of the second part and the bevelled first surface.

[0019] In some embodiments, the bevelled second surface of the second part extends with an angle [3 in the range of 30°-75° with regard to the first direction. Preferably, the bevelled second surface of the second part extends with an angle [3 in the range of 50°-70°with regard to the first direction. In an example, the angle [3 may extend between a bottom surface of the second part and the corresponding bevelled second surface.

[0020] Further, in an embodiment, at least one of the bevelled first surface of the first part and the bevelled second surface of the second part and the corresponding bevelled first and second surfaces with which said bevelled first and second surfaces are in engagement in their first position have a corresponding deviation from linear extension such that the tool holder is prevented from moving in a third direction perpendicular to the first direction and to the second direction when the first and second parts are in their respective first position.

[0021] The corresponding deviation from linear extension provides a rigid clamping effect between the cradle and the tool holder. The rigid clamping effect enables reliable and efficient locking of the tool holder and the cradle of the cradle arrangement in first position.

[0022] In some embodiments, the bevelled first surface of the first part and the corresponding bevelled first surface with which said bevelled first surface is in engagement in its first position both have a V-shape, wherein each leg of the V- shape extends with an angle in the range of 5°-60° in relation to a third direction perpendicular to the first direction and to the second direction. Preferably, each leg of the V-shape extends with an angle in the range of 10°-25° in relation to a third direction perpendicular to the first direction and to the second direction.

[0023] Furthermore, in an embodiment, the bevelled second surface of the second part and the corresponding bevelled second surface with which said bevelled second surface is in engagement with in its first position both have a V-shape, wherein each leg of the V-shape extends with an angle in the range of 5°-60° in relation to a third direction perpendicular to the first direction and to the second direction. Preferably, each leg of the V-shape extends with an angle in the range of 10°-25° in relation to a third direction perpendicular to the first direction and to the second direction. In some embodiments, the first part of one of the cradle and the tool holder has a bevelled third surface extending along a lateral side of the first part and in the first direction and arranged to engage with a corresponding bevelled third surface of the other of the cradle and the tool holder when the first part is in the first position, and arranged to be disengaged from said corresponding bevelled third surface when the first part is in the second position.

[0024] In some other embodiments, the first part of one of the cradle and the tool holder has a bevelled fourth surface extending along a lateral second side of the first part, opposite to said first side, and in the first direction and arranged to engage with a corresponding bevelled fourth surface of the other of the cradle and the tool holder when the first part is in the first position, and arranged to be disengaged from said corresponding bevelled fourth surface when the first part is in the second position.

[0025] In some embodiments, the linear actuator may include a hydraulic power pistoncylinder device engaged in one end with the first part and in an opposite end with the second part. In another embodiment, the rock drilling arrangement may comprise a control unit for automated control of the hydraulic power piston-cylinder device for enabling switching between multiple tools for executing multiple operations during mining procedures.

[0026] In an example, the tool holder may include the first part and the second part.

[0027] According to a second aspect of the present disclosure, a rock drilling and bolting arrangement is provided. The arrangement includes a beam aligned along a longitudinal axis x and a cradle arrangement according to first aspect of the present disclosure. The cradle of the cradle arrangement is attached to the beam and movable in relation to the beam in the direction of said longitudinal axis. Further, the rock drilling arrangement may include a drive unit for moving the cradle arrangement in relation to the beam. In an example, the first direction is parallel with the longitudinal axis x. In some embodiments, the rock drilling and bolting arrangement includes a first sensor for detecting when the first part is in its first position and when the second part is in its first position and when the first part is in its second position and when the second part is in its second position. In addition, the rock drilling and bolting arrangement comprises a second sensor for detecting when cradle arrangement is in its rearmost position along the beam. Further, in an example, the second part is closer than the first part to a free end of the beam. Preferably, the one of the first bevelled surface and the second bevelled surface that mainly adopts impact forces from the tools during operation (drilling or bolting) of the rock drilling and bolting arrangement has a steeper inclination angle in relation to the first direction (and said longitudinal direction) than the other of the first bevelled surface and the second bevelled surface. Thereby, improved ability of adopting such forces may be achieved.

[0028] Furthermore, the bevelled surfaces of the first part and the second part of the cradle arrangement provide a rigid clamping effect between the cradle and the tool holder, when the cradle arrangement is in the first position. The rigid clamping effect enables reliable and efficient locking and unlocking of a tool holder and the cradle of the cradle arrangement. Hence, providing an improved stability to the cradle arrangement. Further, the bevelled surfaces of the first part and the second part are arranged to withstand high forces by the drilling unit and the bolting unit during operation of the rock drilling arrangement. Hence, allowing low maintenance and surveillance of the cradle arrangement.

[0029] Other advantages may be readily apparent to one having skill in the art. Certain embodiments may have some, or all of the recited advantages.

[0030] BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The foregoing will be apparent from the following more particular description of the example embodiments, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the example embodiments.

[0032] Fig. 1 discloses a cradle arrangement in a first position according to some embodiments of the present invention;

[0033] Fig. 2 discloses the cradle arrangement in a second position according to some embodiments of the present invention;

[0034] Fig. 3 discloses the cradle arrangement in a second position according to some embodiments of the present invention;

[0035] Fig. 4A discloses a side view of the cradle arrangement according to some embodiments of the present invention;

[0036] Fig. 4B discloses a top view of the cradle arrangement according to some embodiments of the present invention;

[0037] Fig. 5 discloses an isometric view of a cradle and a tool holder in the cradle arrangement according to some embodiments of the present invention;

[0038] Fig. 6 discloses a rock drilling and bolting arrangement according to some embodiments of the present invention;

[0039] Fig. 7 discloses a top view of the rock drilling and bolting arrangement according to some embodiments of the present invention.

[0040] DETAILED DESCRIPTION

[0041] Aspects of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. The arrangement disclosed herein can, however, be realized in many different forms and should not be construed as being limited to the aspects set forth herein. Like numbers in the drawings refer to like elements throughout.

[0042] The terminology used herein is for describing particular aspects of the disclosure only and is not intended to limit the invention. It should be emphasized that the term “comprises / comprising” when used in this specification is taken to specify the presence of stated features, integers, steps, or components, but does not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0043] According to some embodiments of the present subject matter, as depicted in Fig. 1 , discloses a cradle arrangement 1 in a first position P1 , P2. The cradle arrangement 1 includes a cradle 2 and a tool holder 3 releasably attached to the cradle 2. The tool holder 3 includes a first part 4 and a second part 5. The first part 4 is movable in relation to the second part 5 in a first direction when the tool holder

[0044] 3 is attached to the cradle 2. Further, the cradle arrangement 1 includes a linear actuator 6 for displacing the first part 4 in relation to the second part 5 in said first direction when the tool holder 3 is attached to the cradle 2. In addition, the first part

[0045] 4 of the tool holder 3 has a bevelled first surface 7 extending at an inclination angle with regard to said first direction and arranged to engage with a corresponding bevelled first surface 8 of the cradle 2 when the first part 4 is in a first position P1 . Furthermore, the second part 5 of the tool holder 3 has a bevelled second surface 9 extending at an inclination angle relative to said first direction and arranged to engage with a corresponding bevelled second surface 10 of the cradle 2 when the second part 5 is in a first position P2.

[0046] In order to enable the linear actuator 6 to move both the first and the second parts 4, 5 from and to their respective first and second positions P1 , P2, P3, P4 merely by moving the first part 4 in relation to the second part 5, an abutment member (not visible) is provided on a member which is static in relation to the tool holder 3, in this case the cradle 2, wherein upon engagement of the abutment member and the first part 4, the abutment member prevents further motion of the first part 4 in the first direction, such that further relative motion between the first part 4 and second part

[0047] 5 caused by the linear actuator 6 results in the displacement of the second part 5 in relation to the first part 4 in a direction opposite to the first direction, such that also the second part 5 is displaced in relation to the cradle 2.

[0048] In an embodiment, the first position P1 , P2 of the first part 4 and second part 5 respectively, signifies the locked configuration of the cradle arrangement 1. The tool holder 3 movement is blocked relative to the cradle 2 in a second direction perpendicular to the first direction when the first part 4 is in its first position P1 and the second part 5 is in its first position P2.

[0049] The bevelled first surface 7 of the first part 4 of the tool holder 3 and the corresponding bevelled first surface 8 of the cradle 2, and the bevelled second surface 9 of the second part and the corresponding bevelled surface 10 with which it is in engagement, provides a clamping effect between the cradle 2 and the tool holder 3. The rigid clamping effect enables reliable and efficient locking and unlocking of the tool holder 3 and the cradle 2 of the cradle arrangement 1 . Hence, providing an improved stability to the cradle arrangement 1 during mining operation of the rock drilling arrangement (not shown).

[0050] As shown in Fig. 2, the linear actuator 6 is arranged to move the first part 4 to a second position P3 in which its bevelled first surface 7 is disengaged from said corresponding bevelled first surface 8 of the cradle 2. In addition, the linear actuator

[0051] 6 is arranged to move the second part 5 to a second position P4 in which its bevelled second surface 9 is disengaged from said corresponding bevelled second surface 10 of the cradle 2. The tool holder 3 movement is enabled relative to the cradle 2 in said second direction when the first part 4 is in its second position P3 and the second part 5 is in its second position P4. In an example, the second position P3, P4, respectively, corresponds the unlocked configuration of the cradle arrangement 1 . When the first part 4 and the second part 5 are in their respective second position P3, P4, the tool holder 3 is removable from the cradle 2. The linear actuator 6 includes a hydraulic power piston-cylinder device engaged in one end with the first part 4 and in an opposite end with the second part 5. The rock drilling arrangement (later shown in Fig. 6 and 7) preferably includes a control unit (not shown) for automated control of the hydraulic power piston-cylinder device for enabling switching between multiple tools for executing multiple operations during mining procedures.

[0052] Fig. 3 discloses the cradle arrangement 1 in the second position P3, P4. The cradle arrangement 1 in fully unlocked configuration may slide and switch between one or more tools (not shown) for performing various mining operation by the rock drilling arrangement (not shown). The general principle of changing tool holder 5 when going from drilling to bolting and vice versa, and devices for moving the tool holder(s) 5 to and from engagement with the cradle 2 may be in line with principles and devices known through prior art.

[0053] Furthermore, in an example, the tool holder 3 has a width in a third direction, which is perpendicular to the first direction and the second direction. In addition, the bevelled first surface 7 of the first part 4 extends in said third direction along approximately the whole width of the first part 4. Also, the bevelled second surface 9 of the second part 5 extends in said third direction along approximately the whole width of the second part 5.

[0054] Further, in an example, as shown in Fig. 4A that discloses a side view of the cradle arrangement 1. Fig. 4A shows the first part 4 and second part 5 in a locked configuration. The bevelled first surface 7 of the first part 4 extends with an angle a in the range of 30°-75° with regard to the first direction. Preferably, the bevelled first surface 7 of the first part 4 extends with an angle a in the range of 35°-55° with regard to the first direction. The angle a extends between a base 11 of the first part 4 and the bevelled first surface 7. In the disclosed embodiment, a is 45°.

[0055] The bevelled second surface 9 of the second part 5 extends with an angle [3 in the range of 30°-75° with regard to the first direction. Preferably, the bevelled second surface 9 of the second part 5 extends with an angle [3 in the range of 50°-70°with regard to the first direction. The angle [3 extends between a bottom surface 12 of the second part 5 and the corresponding bevelled second surface 10. In the disclosed embodiment, [3 is 60°.

[0056] At least one of the bevelled first surface 7 of the first part 4 and the bevelled second surface 9 of the second part 5 and the corresponding bevelled first and second surfaces 8, 10 with which said bevelled first and second surfaces 7, 9 are in engagement in their first position P1 , P2, have a corresponding deviation from linear extension such that the tool holder 3 is prevented from moving in a third direction perpendicular to the first direction and to the second direction when the first and second parts 4, 5 are in their respective first position P1 , P2.

[0057] Fig. 4B discloses a top view of the cradle arrangement 1. In an example, the bevelled first surface 7 of the first part 4 and the corresponding bevelled first surface 8 with which said bevelled first surface 7 is in engagement in its first position P1 both have a V-shape. Each leg of the V-shape may extend with an angle in the range of 5°-60° in relation to a third direction perpendicular to the first direction and to the second direction. Each leg of the V-shape extends with an angle in the range of 10°-25° in relation to a third direction perpendicular to the first direction and to the second direction. In the disclosed example, each leg of the V-shape of the first bevelled surface 7 extends with an angle of 10° in relation to said third direction.

[0058] The bevelled second surface 9 of the second part 5 and the corresponding bevelled second surface 10 with which said bevelled second surface 9 is in engagement with in its first position P2 both have a V-shape. Further, each leg of the V-shape may extend with an angle in the range of 5°-60° in relation to a third direction perpendicular to the first direction and to the second direction. Each leg of the V- shape may extend with an angle in the range of 10°-25° in relation to a third direction perpendicular to the first direction and to the second direction. In the disclosed example, each leg of the V-shape of the second bevelled surface 9 extends with an angle of 10° in relation to said third direction. Fig. 5 shows an isometric view of a cradle 2 and a tool holder 3 in the cradle arrangement 1. The first part 4 includes a bevelled third surface (not shown) extending along a lateral side 13 of the first part 4 and in the first direction. The bevelled third surface (not shown) is arranged to engage with a corresponding bevelled third surface 14 of the second part 5 when the first part 4 is in the first position P1 , and arranged to be disengaged from said corresponding bevelled third surface 14 when the first part 4 is in the second position P3.

[0059] The first part 4 also includes a bevelled fourth surface (not shown) extending along a lateral second side 15 of the first part 4, opposite to said first side 14, and in the first direction. The bevelled fourth surface (not shown) is arranged to engage with a corresponding bevelled fourth surface 16 of the second part 5 when the first part 4 is in the first position P1 , and arranged to be disengaged from said corresponding bevelled fourth surface 16 when the first part 4 is in the second position P3.

[0060] According to a second aspect of the present disclosure, Fig. 6 shows a rock drilling and bolting arrangement 60. The rock drilling and bolting arrangement 60 includes a beam 62 aligned along, i.e. , having, a longitudinal axis x. The rock drilling and bolting arrangement 60 includes the cradle arrangement 1 , in which the cradle 2 of the cradle arrangement 1 is attached to the beam 62. Further, the cradle 2 is movable in relation to the beam 62 in the direction of the longitudinal axis x. The previously defined first direction is parallel with the longitudinal axis x.

[0061] The rock drilling and bolting arrangement 60 includes a drive unit (not shown) for moving the cradle arrangement 1 in relation to the beam 62. Further, the beam 62 is attached to the rock drilling and bolting arrangement 60 by means of booms (not shown). In an example, the rock drilling and bolting arrangement 60 includes a rock drilling unit 64 and a bolting unit 66 which may be used for drilling operation as well as for bolting operation consecutively.

[0062] The cradle arrangement 1 is arranged to position the drilling unit 64 and the bolting unit 66. In addition, when a switching operation is initiated, the linear actuator 6 is arranged to move the first part 4 to the second position P3 and the second part 5 to the second position P4 (as shown in Fig. 3). The aforementioned movement allows switching between the drilling unit 64 and the bolting unit 66 for executing multiple operations during mining procedures. In an example, the second part 5 is closer to a free end of the beam 62 than the first part 4.

[0063] As shown in Fig. 7 that discloses a top view of the rock drilling and bolting arrangement 60. In an example, the rock drilling and bolting arrangement 60 includes a first sensor 68, 69, 73, 74 for detecting when the first part 4 is in its first position P1 and when the second part 5 is in its first position P2 and when the first part 4 is in its second position P3 and when the second part 5 is in its second position P4. Further, the rock drilling and bolting arrangement 60 includes a second sensor 71 for detecting when the cradle arrangement 1 is in its rearmost position along the beam 62. In another example, the rock drilling and bolting arrangement 60 includes an indexing sensor 70, 72 for detecting when the cradle arrangement 1 of the drilling unit 64 or the bolting unit 66 is aligned with the beam 62 for operation.

[0064] Therefore, the bevelled surfaces 7, 8, 9, 10, 14, 16 of the first part 4 and the second part 5 of the cradle arrangement 1 provide a rigid clamping effect between the cradle 2 and the tool holder 3, when the cradle arrangement 1 is in the first position P1 , P2. The rigid clamping effect enables reliable and efficient locking and unlocking of a tool holder 3 and the cradle 2 of the cradle arrangement 1. Hence, providing an improved stability to the cradle arrangement 1. Further, the bevelled surfaces 7, 8, 9, 10, 14, 16 of the first part 4 and the second part 5 are arranged to withstand high forces by the drilling unit 64 and the bolting unit 66 during operation of the rock drilling arrangement 60. Hence, allowing low maintenance and surveillance of the cradle arrangement 1 .

[0065] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and / or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the scope of the disclosure.

Claims

CLAIMS1 . A cradle arrangement (1 ) for a rock drilling arrangement, comprising- a cradle (2),- a tool holder (3), releasably attached to the cradle (2),- wherein one of the cradle (2) and the tool holder (3) comprises a first part (4) and a second part (5), wherein the first part (4) is movable in relation to the second part (5) in a first direction when the tool holder (3) is attached to the cradle (2),- wherein the cradle arrangement (1 ) comprises a linear actuator (6) for displacing the first part (4) in relation to the second part (5) in said first direction when the tool holder (3) is attached to the cradle (2),- wherein said first part (4) of one of the cradle (2) and the tool holder (3) has a bevelled first surface (7) extending at an inclination angle with regard to said first direction and arranged to engage with a corresponding bevelled first surface (8) of the other of the cradle (2) and the tool holder (3) when the first part (4) is in a first position (P1 ),- wherein said second part (5) of one of the cradle (2) and the tool holder (3) has a bevelled second surface (9) extending at an inclination angle relative to said first direction and arranged to engage with a corresponding bevelled second surface (10) of the other of the cradle (2) and the tool holder (3) when the second part (5) is in a first position (P2).

2. A cradle arrangement according to claim 1 , wherein, tool holder (3) movement is blocked relative to the cradle (2) in a second direction perpendicular to the first direction when the first part (4) is in its first position (P1 ) and the second part (5) is in its first position (P1 ), and tool holder (3) movement is enabled relative to the cradle (2) in said second direction when the first part (4) is in its second position (P3) and the second part (5) is in its second position (P4).

3. A cradle arrangement according to claim 1 or 2, wherein the linear actuator (6) is arranged to move the first part (4) to a second position (P3) in which its bevelled first surface (7) is disengaged from said corresponding bevelled first surface (8) of the other of the cradle (2) and the tool holder (3), and to move the second part (5) to a second position (P4) in which its bevelled second surface (9) is disengagedfrom said corresponding bevelled second surface (10) of the other of the cradle (2) and the tool holder (3).

4. A cradle arrangement (1 ) according to claim 1 , wherein the tool holder (3) has a width in a third direction, which is perpendicular to said first direction and to said second direction, and wherein the bevelled first surface (7) of the first part (4) extends in said third direction along at least half the width w of the first part (4).

5. A cradle arrangement (1 ) according to claim 1 or 2, wherein the bevelled first surface (7) of the first part (4) extends with an angle a in the range of 30°-75°, and preferably with an angle a in the range of 35°-55° with regard to the first direction.

6. A cradle arrangement (1 ) according to any one of claims 1 -3, wherein the bevelled second surface (9) of the second part (5) extends with an angle [3 in the range of 30°-75°, and preferably with an angle [3 in the range of 50°-70°with regard to the first direction.

7. A cradle arrangement (1 ) according to any one of claims 1 -5, wherein at least one of the bevelled first surface (7) of the first part (4) and the bevelled second surface (9) of the second part (5) and the corresponding bevelled first and second surfaces (8, 10) with which said bevelled first and second surfaces (7, 9) are in engagement in their first position (P1 , P2) have a corresponding deviation from linear extension such that the tool holder (3) is prevented from moving in a third direction perpendicular to the first direction and to the second direction when the first and second parts (4, 5) are in their respective first position (P1 , P2).

8. A cradle arrangement (1 ) according to any one of clams 1 -6, wherein, the bevelled first surface (7) of the first part (4) and the corresponding bevelled first surface (8) with which said bevelled first surface (7) is in engagement in its first position (P1 ) both have a V-shape, each leg of the V-shape extending with an angle in the range of 5°-60° and preferably with an angle in the range of 10°-25° in relation to a third direction perpendicular to the first direction and to the second direction.

9. A cradle arrangement (1 ) according to any one of clams 1 -7, wherein, the bevelled second surface (9) of the second part (5) and the corresponding bevelled second surface (10) with which said bevelled second surface (9) is in engagement with in its first position (P2) both have a V-shape, each leg of the V-shape extending with an angle in the range of 5°-60° and preferably with an angle in the range of 10°-25° in relation to a third direction perpendicular to the first direction and to the second direction.

10. A cradle arrangement (1 ) according to any one of claims 1-8, wherein said first part (4) of one of the cradle (2) and the tool holder (3) has a bevelled third surface extending along a lateral side (13) of the first part (4) and in the first direction and arranged to engage with a corresponding bevelled third surface (14) of the other of the cradle (2) and the tool holder (3) when the first part (4) is in the first position (P1 ), and arranged to be disengaged from said corresponding bevelled third surface when the first part (4) is in the second position (P3).11 . A cradle arrangement (1 ) according to claim 9, wherein said first part (4) of one of the cradle (2) and the tool holder (3) has a bevelled fourth surface extending along a lateral second side (15) of the first part (4), opposite to said first side (13), and in the first direction and arranged to engage with a corresponding bevelled fourth surface (16) of the other of the cradle (2) and the tool holder (3) when the first part (4) is in the first position (P1 ), and arranged to be disengaged from said corresponding bevelled fourth surface when the first part (4) is in the second position (P3).

12. A cradle arrangement (1 ) according to any one of claims 1 -11 , wherein the tool holder (3) comprises the first part (4) and the second part (5).

13. A rock drilling and bolting arrangement (60) comprising- a beam (62) aligned along a longitudinal axis (x), and- a cradle arrangement (1 ) according to any one of claims 1-12, wherein the cradle (2) of the cradle arrangement (1 ) is attached to the beam (62) and movable in relation to the beam (62) in the direction of said longitudinal axis (x), and whereinthe rock drilling arrangement (60) comprises a drive unit for moving the cradle arrangement (1 ) in relation to the beam (62).

14. A rock drilling arrangement (60) according to claim 13, wherein the first direction is parallel with the longitudinal axis (x).

15. A rock drilling arrangement (60) according to claim 13 or 14, comprising a first sensor (68, 69, 73, 74) for detecting when the first part (4) is in its first position (P1 ) and when the second part (5) is in its first position (P2) and when the first part 4 is in its second position P3 and when the second part 5 is in its second position P4.

16. A rock drilling arrangement (60) according to any one of claims 13-15, comprising a second sensor (71 ) for detecting when the cradle arrangement (1 ) is in its rearmost position along the beam 62.

17. A rock drilling arrangement (60) according to any of claims 13-16, wherein the second part (5) is closer than the first part (4) to a free end of the beam (62).

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