JP2011525578A - Drill bit replacement method in a drill bit magazine, a drill bit holder, and a rock drilling device. - Google Patents

Abstract

  The present invention relates to a drill bit magazine, a drill bit holder, and a method for exchanging a drill bit in a rock drilling apparatus. The magazine (16) has a number of spaces (30), each space being configured to receive one drill bit holder (22). The drill bit (12) is supported in the magazine by a drill bit holder. Furthermore, the transfer between the magazine and the retainer (14) takes place by acting only on the drill bit holder. The drill bit holder is a protruding part and is supported in contact with at least one inner surface (41) of the drill bit.

Description

Background of the Invention

  The present invention relates to a magazine capable of storing replaceable drill bits for rock drill tools. The drill bit can be secured to the drill rod of the tool by a drill bit changer. The magazine has a plurality of spaces for storing the drill bits and a movable frame portion, and the space for supporting the drill bits is one at a time for removing the drill bits from the magazine and for carrying them into the magazine. , Can be placed in the magazine exchange station.

  The invention further relates to a drill bit holder and a method for handling the drill bit.

  The subject matter of the present invention is described in further detail in the preceding part of the independent claims.

  During rock drilling, a rock drill is used with a tool connected to the rock drill, the tool can be rotated about its longitudinal axis, and an impact pulse is applied through the tool to the rock to be drilled, thereby Destroy the bedrock and drill holes. The tool may include one or more drill rods and a replaceable drill bit connected to the outermost end of the drill rod. In general, a plurality of bit buttons are provided at the tip of the drill bit, and the bit button pierces the drilled rock. Drill bits are very heavy during drilling and are therefore worn and sometimes damaged. Therefore, it is necessary to change the drill bit many times to ensure the quality and efficiency of the drilling. It is difficult for the operator to manually change the drill bit, which is time consuming and even dangerous for the worse. Therefore, drill bit changers have been developed and mechanized for replacement. However, current methods of storing and handling drill bits do not fully meet user requirements. For example, U.S. Pat. No. 4,065,845 discloses a drill bit changer that places drill bits in space with a magazine, but this has limitations on the shape and dimensions of the drill bit.

BRIEF DESCRIPTION OF THE INVENTION

  It is an object of the present invention to provide a new and improved magazine and drill bit holder for storing and handling drill bits. Another object is to provide a new and improved drill bit replacement method.

  The drill bit magazine of the present invention is configured such that each space of the magazine removably receives and connects a separate drill bit holder one by one, and the stored drill bits are respectively stored in the magazine by the drill bit holder. The drill bit holder is configured to be supported in contact with at least one inner surface of the drill bit.

  The drill bit holder of the present invention is a separate protruding part that can be supported on at least one inner surface of the drill bit, the drill bit holder including a gripping portion for handling and securing the drill bit holder. Features.

  According to the method of the present invention, a protruding drill bit holder, which is a separate part from the magazine, is arranged inside each drill bit, and the drill bit to be replaced is inserted into the drill bit holder during its transfer and storage, respectively. It is characterized in that the drill bit holder is removed from the drill bit before it is handled only by acting against it and before the drill rod and drill bit are connected to each other.

  The concept of the present invention is to arrange a projecting-shaped drill bit holder inside the drill bit and to support it in contact with at least one inner surface of the drill bit during transfer and storage of the drill bit. Therefore, it is not necessary to act on the outer surface of the drill bit stored in the magazine to move between the magazine and the retainer. The drill bit holder is a kind of adapter between the drill bit and the magazine and between the drill bit and the transfer device. The drill bit holder is not involved in securing the drill bit to the tool, but can function as an independent removable transfer and storage adapter.

  An advantage of the present invention is that the drill bit holder can easily store and handle drill bits of various shapes and sizes. Thus, various drill bits can be handled using the same magazine and transfer device. This increases the functional adaptability of the drill bit exchanger using various drill bits. In addition, this saves costs. This is because it is possible to manufacture general-purpose magazines and transfer devices that can be widely used in rock drilling devices that support various drilling situations. A further advantage is that it is easier to place the drill bit at the desired position of the retainer. This is because the outer peripheral portion of the drill bit is not brought into contact with the gripping device of the transfer device or the like.

  The concept of an embodiment is that the frame part of the magazine is a disk-shaped part, the disk-shaped part is provided with a plurality of locking holes, each of which is configured to receive one drill bit holder. That is. Each locking hole is opened toward the outer periphery of the disc-shaped frame portion. The drill bit holder has a locking portion with a locking groove, is supported by the locking groove with respect to the locking hole, and can move in the radial direction of the disk-shaped frame portion at the exchange station. Further, the drill bit holder cannot move in the radial direction of the frame portion from the locking space at a place other than the exchange station. This disc-shaped frame portion of the magazine is rotatable about a rotation axis and moves the drill bit holder with respect to the exchange station.

  The concept of an embodiment is to support the drill bit stored in the magazine on the magazine frame only by the drill bit holder.

  The concept of an embodiment is that the drill bit holder has a grip part, and the grip part detachably locks a separate drill bit holder to the magazine. Furthermore, the drill bit holder can be moved between the magazine and the drilling center by gripping the grip portion by the transfer device.

  The concept of an embodiment is that the grip of the drill bit holder is at the free end of the holder.

  The concept in one embodiment is that the drill bit holder includes an elongated arm that has a cylindrical grip at its first end. The grip portion has an elongated hole, and the drill bit changer can be attached by pushing the transfer pin of the transfer device of the drill bit changer into the hole. Further, an annular locking groove is provided on the outer periphery of the grip portion, and the drill bit holder can be locked to the magazine by this groove.

  The concept of an embodiment is that the drill bit holder includes an elongate arm and at least two support components configured to be supported against an internal connection screw of the drill bit. The first support component can move relative to the arm, and the second support component is arranged at the outermost end of the arm so as not to move relative to the arm. Therefore, these supporting parts can be installed at an axial distance from each other by moving the arm with respect to the first supporting part, and can also be installed in contact with each other. it can.

  The concept of an embodiment is that the drill bit holder includes at least one adjustment member and sets a maximum axial distance between the first support part and the second support part so that the drill bit being handled is There is to match. By adjusting, the drill bits of various lengths can be set in the magazine so that the tips of the drill bits are basically at the same height as each other. The tip of the drill bit may be axially supported in contact with a suitable support plate or the like in the magazine so that the drill bit can be drilled even if the drilling device and magazine are directed downwards. It will not come off the holder. In addition, if the drill bit tips are basically adjusted to the same height and the magazine is in the retainer, the drill bit must be transferred between the retainer and the magazine by a simple linear translation. Can do.

  One embodiment concept is that the first support part of the drill bit holder comprises a cylindrical portion that can be disposed inside the drill bit and a shoulder that can be disposed against the back of the drill bit. There is to include.

  The concept of an embodiment is that the top of the drill bit holder is supported against the bottom of the drill bit hole and is further arranged to support the drill bit in the axial direction. Therefore, one support part of the drill bit holder is arranged to handle the axial support and the other support part is arranged to support the drill bit so that it is parallel to the drill bit holder. Can do.

  The concept of an embodiment is that by replacing the first and second support parts of the drill bit holder with removable parts, these support parts can be exchanged to correspond to the drill bit currently being handled. It is possible to do.

  The concept in one embodiment is to store and handle at least two drill bits of different outer dimensions or outlines simultaneously by means of a drill bit exchanger. These different drill bits are supported in the magazine by similar drill bit holders. A very different drill bit can be stored in the magazine without any changes to the structure, even if it is for special drilling situations.

  The concept in one embodiment is that there is a shape lock between the drill bit holder and the gripping member of the transfer device. The shape locking part opens when the drill bit holder is inserted into the magazine. The shape locking part ensures a reliable locking. The movement of the shape locking member to the open position can be done mechanically when the transfer device moves towards the magazine, and when the transfer member leaves the magazine, the shape locking member is moved to the locking position by a spring member. You can go back.

  In one embodiment, the concept is that a shape locking member between the drill bit holder and the gripping member of the transfer device fits in the gripping member in at least one locking groove or similar locking recess in the drill bit holder. And having at least one spring locking device configured as described above. Means for stopping the spring locking device from bending away from the locking recess, i.e. means for strengthening the spring locking device, can be arranged in the gripping member.

Several embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.
1 is a schematic side view of a rock drilling rig having a rock drilling unit including a retainer and a drill bit changer attached to the retainer. Or FIG. 2B is a schematic perspective view of the drill bit, and FIG. 2B is a diagram illustrating a method of gripping a hole inside the drill bit. It is a schematic top view which shows operation | movement of a drill bit exchange machine. It is the schematic of a magazine. FIG. 5 is a schematic partial cross-sectional detail view of the magazine of FIG. 4. It is a schematic side view of the suitable shape latching | locking part between the holding member of a transfer apparatus, and a drill bit holder. It is a general | schematic fragmentary sectional side view of the holding member of a transfer apparatus. and It is a schematic top view which shows the latching principle of the holding member shown in FIG. and It is a schematic sectional side view which shows the other structure which latches a holding member to a drill bit holder depending on an expansion machine element.

  In these figures, some embodiments of the present invention are shown in a simplified manner for clarity. Similar parts are denoted by the same reference numerals in these figures.

Detailed Description of the Invention

  A rock drilling rig 1 shown in FIG. 1 includes a movable carrier 2. One or more drilling booms 3 are disposed on the movable carrier, and a drilling unit 4 is provided at the outermost end of the drilling boom. . The drilling unit 4 includes a feed beam 5, which supports a rock drill 6, which can be moved in the drilling direction A and the return direction B by a feed device 7. In this figure, the alternate long and short dash line represents the perforation line, that is, the perforation center C. The rock drill 6 may include an impact device 8, which applies an impact pulse to the tool 9 connected to the rock drill 6 by the impact device. Furthermore, the rock drill 6 may include a rotating device 10 by which the tool 9 is rotated about its longitudinal axis. During drilling, the tool 9 is at the drilling center C and the tool may include a drill rod 11, which has a replaceable drill bit 12 at its outermost end. Further, in so-called extension rod drilling, a plurality of drill rods 11 are connected to form a long hole 13. When drilling holes in the rock, replace the drill bit 12 during drilling because the bit buttons on the drill bit 12 or similar parts that cut the rock can wear and become damaged. In addition, rock drilling and drilling quality can be improved using different special bits for different drilling conditions and rock conditions. The drill bit 12 is generally connected to the drill rod 11 by a threaded connection.

  There is a retainer 14 at the distal end of the feed beam 5, that is, at the outermost end when viewed in the drilling direction A of the feed beam 5, and the retainer includes a jaw or similar holding member and can be replaced by the holding member. The drill bit 12, at least while the threaded connection between the drill rod 11 and the drill bit 12 is opened or closed by rotating the drill rod by means of the rotating device 10 of the rock drill 6, Can be fixed so that it does not move. The retainer 14 may be positioned so that the held tool 9 is at the drilling center C. The retainer 14 can take various structures.

  At the distal end of the feed beam 5, there is also a drill bit changer 15 connected to the retainer 14, which has a magazine 16, in which the required number, typically five to five, is provided. Ten drill bits can be provided. The magazine 16 may be a rotating disk, and a space for supporting the stored drill bit 12 is formed in the rotating disk. As another option, the magazine 16 may be a chain magazine with some space or other suitable structure corresponding thereto. The drill bit changer 15 may further include one or more stopping members 17, and the drill bit 12 may be mechanically stopped at a predetermined axial position of the drilling center C by the stopping members. The stop member 17 can be, for example, a slide, which can be pushed into the drilling center C from the front side of the retainer 14 and before the drill bit 12 is secured against movement by the retainer 14 for replacement. The tip of the bit 12 is pressed against the surface of the slide rock drill 6 side. Still further, the drill bit changer 15 may include one or more transfer devices 18 by which the drill bit 12 can be moved from the magazine 16 to the retainer 14 and from the retainer to the drill bit.

  Various drill bits 12 are shown in FIGS. 2a-2c. As can be seen from these figures, these drill bits 12 are quite different in appearance. The drill bit 12 of FIG. 2a has a spiral groove in the outer peripheral portion of the frame portion 12a. In contrast, in the drill bit 12 of FIG. 2b, the frame portion 12a is a smooth cylinder. Further in FIG. 2c, there is a grooved shoulder 20 in the frame portion 12a. If the drill bits 12 are different, the appearance may be greatly different from each other. Therefore, it is difficult to handle these drill bits 12 using the frame portion 12a. There is a need to make a gripper or similar suitable for any drill bit. On the other hand, it is necessary to avoid gripping the apex of the tip of the drill bit 12 or the mechanism 12b. This is because this part is provided with a drill button 21 which is the most important part of the drill bit and is hard but fragile. However, the drill bit 12 may be handled by a suitable protruding shape or pin-like separate drill bit holder 22 which is usually used in the drill bit frame portion 12a configured to accept the connection of the drill rod 11. It may be pushed into the hole 23. The drill bit holder 22 allows the drill bit 12 to be handled in a magazine and without damaging the mechanism 12b during transfer.

  FIG. 3 shows a drill bit changer 15 provided in the retainer 14. The exchange 15 may include a transfer device 18, which is a kind of manipulator. The transfer device 18 may include a first transfer device 18a and a second transfer device 18b, the first transfer device and the second transfer device being connected to each other by a fixed part 35. The first transfer device 18a is configured to move the second transfer device 18b and the gripping member 36 connected to the second transfer device in a row in the lateral direction E, and the drill bit 12 is moved between the magazine 16 and the retainer 14. It can be moved between Joe 25. The second transfer device 18b is configured to insert the drill bit holder 22 into and out of the drill bit hole 23. The drill bit holder 22 is an elongate part, the first end of the drill bit holder may include a gripping portion 38, to which the gripping member 36 of the transfer device 18 may be attached and drilled by the gripping portion. The bit holder 22 is locked to the magazine 16. Furthermore, the drill bit holder 22 may include an arm 39, in which two or more support parts 40a and 40b are arranged on the arm, the support parts being inside the hole 23 of the drill bit 12 when connected to the connection screw 41. Dimensioned to be supported in contact with In addition, the last first support piece 40a may include a shoulder 46, a flange, or the like, thereby being supported in contact with the back of the drill bit 12 and further supporting the drill bit 12 in the axial direction. can do. When the drill bit holder 22 is pushed into the hole 23 by the second transfer device 18b, the first support part 40a is fixed to the rear part of the drill bit 12, while the second support part 40b is firmly connected to the arm 39. The drill bit 12 can be further advanced in the direction of the tip. The support parts 40a and 40b are fixed at a distance from each other, whereby the drill bit 12 is firmly supported by the surface of the hole 23. By separating the support parts 40a and 40b, the drill bit 12 is surely kept straight. The drill bit holder 12 may include an adjusting member 45 such as an adjusting screw, and the maximum distance in the H direction between the support parts 40a and 40b can be adjusted by the adjusting member. At the same time, the adjustment member 45 affects the distance in the H direction between the grip portion 38 and the first support component 40a. Since the drill bit 12 is supported by the shoulder 46 at the rear portion, the tip of the drill bit 12 of various lengths can be stored in the same place of the magazine 16 by adjusting the drill bit holder 22. When the magazine is installed in the retainer 14 in the axial direction, and the tip of the drill bit 12 is set at the same height in the magazine, the transfer between the magazine 16 and the retainer 14 is performed using the first transfer device 18a. This can be done by a simple lateral linear motion E.

  When the drill bit 12 is sandwiched between the jaws 25, the second transfer device 18b pulls the drill bit holder 22 backward, that is, in the return direction B, so that the support parts 40a and 40b are brought into contact with each other and fixed. Come out from 23. Next, the drill bit holder 22 is moved from the drilling center C by the first transfer device 18a, the drill rod 11 is connected to the drill bit 12, and then the stop member 17 and the jaw 25 are opened. Then normal drilling can be started.

  FIG. 3 further shows the drill rod 11 being moved in the return direction B at the drilling center C when changing the drill bit 12. A connecting portion 43 is provided at the tip of the drill rod 11, and the connecting portion has a connecting screw 44. The connection screw can be connected to the internal connection screw 41 of the drill bit 12 in the retainer 14, which feeds the drill rod 11 in the drilling direction A and at the same time the drill rod 11 about its longitudinal axis of the rock drill 6. This is performed by rotating the rotating device 10. When the drill bit 12 connected to the drill rod 11 is removed, the stop member 17 is closed and the drill bit 12 is pressed against the stop member 17. In this way, the drill bit 12 is always accurately positioned with respect to the transfer device 18 and the retainer 14.

  FIG. 4 also shows that the magazine 16 may include a disk-shaped frame portion 50, and the required drill bit can be selected by rotating the disk-shaped frame portion about the rotation axis 29. FIG. There are several spaces 30 around the frame portion 50 of the magazine 16, and a drill bit holder 22 similar to the drill bit holder shown in FIGS. 2b and 3 can be removably disposed in this space. By rotating the frame part 50 in the G direction, each space 50 can be set in the exchange station 37 one at a time. At the exchange station, a transfer device for transferring a drill bit holder and an appropriate drill bit attached to the drill bit holder. The drill bit holder can be removed from the magazine by means of or can be arranged in the empty space 30 by means of a transfer device. These spaces 30 are elongated holes that open to the outer periphery of the frame portion 50. The protective part 51 surrounds the outer periphery of the frame part 50, so that the drill bit holder can be prevented from coming out of the space 30 at a place other than the exchange station 37.

  FIG. 5 shows the magazine 16 of FIG. 4 in detail. The grip portion 38 of the drill bit holder may be cylindrical, and the grip portion 38 can be fixed to the elongated space 30 of the frame portion 50 of the magazine by the annular locking groove 52 and the locking groove. This figure also shows a protective part 51 that prevents the drill bit holder from sliding out of the space 30 in the radial direction of the disc-shaped frame part.

  Of course, the gripping portion 38 of the drill bit holder 22 may be made in other ways, such as a magazine space 30 or a transfer pin or similar gripping member 36 of a transfer device.

  If the magazine 16 is a chain magazine, the movable chain forms its frame part, which is provided with several locking spaces for receiving the drill bit holders 22. Similarly, the frame portion of the magazine can have a variety of shapes, and the frame portion may move linearly rather than rotationally.

  It should be noted that the support parts 40a, 40b of the drill bit holder 22 may include means for gripping the hole 23 of the drill bit, so that even when the feed beam 5 is facing down. The drill bit 12 does not come off the holder 22. The support parts 40a, 40b may include friction parts such as retaining rings made of rubber or similar elastic material. Further, the drill bit holder 22 may have an extension, and the extension may be expanded by the action of a pressure medium or the effect of mechanical movement and push the inner surface of the hole 23 of the drill bit 14.

  FIG. 6 shows a very simplified structure for locking the drill bit holder 22 to the gripping member 36 of the transfer device. The gripping member 36 may comprise a spring locking member 60, the spring locking member having a locking claw or similar projection 61, where the spring locking member or projection is drilled at its locking position. It may be located in the locking groove of the hole 62 in the holding part 38 of the bit holder 22 or in a similar locking recess. Accordingly, a shape locking portion is formed between each spring locking member 60 and the locking recess 63, and the drill bit holder 22 is prevented from being accidentally detached from the gripping member 36. The spring locking member 60 may not move at each locking position, so that the locking projection 61 cannot be removed from the locking recess as shown by the broken line in FIG. The gripping member 36 may have means for releasing the locking projection 61 when desired, whereby the gripping member 36 can be removed from the drill bit holder 22. Of course, instead of the spring-like locking member 60, a rigid locking member that is shape-locked to the hole 62 on the shape surface may be used. The relative movement of the shape locking member for opening and closing the shape locking part can be effected mechanically, for example by moving the transfer device, or is required using a pressure medium actuated or electrically actuated actuator. Can exercise.

  FIG. 7 shows a gripping member 36 that includes two spring locking members 60 secured to the frame 64. Further, the gripping member has a center pin 65, and the center pin is disposed so as to be rotatable with respect to the frame 64. The center pin 65 is provided with a groove 66 in the longitudinal direction, so that the center pin 65 can rotate about its longitudinal axis and turn to a position where these grooves 66 come to the spring locking member 60. . The spring locking member 60 may then enter the groove 66 so that the spring locking member can be withdrawn from the locking bit or the like of the drill bit holder. At each locking position, the spring locking member 60 is in contact with the outer surface of the center pin 65, so that the spring locking member cannot be removed from the locking groove of the drill bit holder. In the present embodiment, the spring locking member 60 cannot move in the respective locking positions in this way, so that the shape locking between the drill bit holder and the gripping member 36 is robust. When the spring locking member 60 is in the position of the groove 66 and the gripping member 36 is pressed against the gripping portion of the drill bit holder, the spring locking member 60 bends in the direction of the groove 66 and finally locks the drill bit holder. It can be bent until it is pushed into the groove.

  FIG. 8a shows a very simplified situation where the groove 66 and the spring locking member 60 are in different locations. When the transfer device moves the gripping member 36 in the direction R, the first mating surface 67 collides with the second mating surface 68 in the magazine 16, causing a rotational movement S of the center pin 65. As a result, the groove 66 is fixed at the position of the spring locking member 60 as shown in FIG. After the gripping member 36 is moved from the magazine 16, the spring member can act on the center pin 65 to rotate the center pin back to its fixed position.

  FIG. 9a shows a structure in which the gripping member 36 is locked to the drill bit holder 22 by an expanding locking member 70 such as a rubber sleeve. The drill bit holder 22 may have a locking recess 63 or a locking groove.After the rotating member 71 acts and the center pin 72 presses the locking member 70 with the pressure sleeve 73, the locking member 70 As shown in FIG. 9b, it is possible to enter the locking recess or the locking groove from the side. A thread 74 having a large pitch may be provided between the center pin 72 and the pressure sleeve 73, and this thread converts the rotational motion of the center pin 72 into a linear motion of the pressure sleeve 73. The rotating member 71 may be moved in a manner similar to that of moving the first mating surface 67 in FIGS. 8a and 8b. Of course, the center pin 72 may be rotated by an appropriate rotating device. The expansion locking member 70 may be a spring member such as a spring plate that receives pressure and expands in the lateral direction and pushes into the locking recess 63.

  It should be noted that the locking scheme shown in FIGS. 8a-9b is also applicable when the gripping member 36 directly grips a drill bit or some other element.

  In some cases, the configuration requirements described in this application may be used regardless of other configuration requirements. On the other hand, the constituent requirements described in the present application may be combined as necessary to create various combinations.

  The accompanying drawings and the associated description are only intended to illustrate the concept of the invention. The invention may vary in detail within the scope of the claimed invention.

Claims (12)

Can store multiple interchangeable drill bits used for rock drilling,
The movable frame (50),
A plurality of spaces (30) configured to hold one drill bit (12) one by one;
At least one exchange station (37), and by moving the frame portion (50), each space (30) moves toward the exchange station at one time, whereby the drill bit (12) is moved to the exchange station. In a drill bit magazine that can be carried into an empty space (30) in (37) and can move a drill bit (12) from the space (30) in the exchange station (30),
Each space (30) of the magazine (16) is configured to removably receive and connect one separate drill bit holder (22);
Each stored drill bit (12) is configured to be supported in the magazine (16) by the drill bit holder (22);
The drill bit magazine (22), wherein the drill bit holder (22) is supported in contact with at least one inner surface of the drill bit (12). The drill bit magazine according to claim 1,
The frame portion (50) of the magazine is a disk-shaped part having a plurality of locking holes (30), each locking hole being configured to receive one drill bit holder (22),
Each locking hole (30) opens in the outer peripheral direction of the disk-shaped frame portion (50),
The drill bit holder (22) includes a grip portion (38) having a locking groove (52), and the drill bit holder (22) is inserted into the locking hole (30) by the locking groove (52). Can be moved in the radial direction of the disc-shaped frame part (50) at the exchange station (37),
The drill bit holder (22) cannot be moved by at least one protective member (51) when not in the exchange station (37);
The drill bit magazine characterized in that the disk-shaped frame part (50) is rotatable about a rotating shaft (29) so that the locking hole (30) moves relative to the exchange station (37).   The drill bit magazine according to claim 1 or 2, wherein the drill bit (12) stored in the magazine (16) is supported only by the drill bit holder (22) with respect to the frame portion (50) of the magazine. This is a drill bit magazine. In drill bit holders that handle interchangeable drill bits used in rock drilling,
The drill bit holder (22) is a separate projecting shaped part that can be supported against at least one inner surface of the drill bit (12);
The drill bit holder (22) includes a grip portion (38) for handling and locking the drill bit holder (22). The drill bit holder according to claim 4,
The drill bit holder (22) includes an elongated arm (39) having a cylindrical grip (38) at a first end of the arm (39);
A longitudinal hole (54) is provided in the central axis of the grip portion (38), and a transfer device (18) of a drill bit changer acts on the hole,
An annular locking groove (52) is provided on the outer surface of the grip portion (38), and the drill bit holder (22) can be locked to the magazine (16) by the locking groove. Drill bit holder. The drill bit holder according to claim 4 or 5,
The drill bit holder (22) includes one elongate arm (39) and at least two support parts (40a, 40b), which support parts are connected to the internal connection screw (41) of the drill bit (12). Configured to be supported in contact,
The first support part (40a) is arranged to be movable relative to the arm (39);
The second support component (40b) is arranged at the outermost end of the arm (3) so as not to move relative to the arm (39),
The first support part (40a) and the second support part (40b) are spaced apart from each other in the axial direction by moving the arm (39) relative to the first support part (40a). A drill bit holder characterized in that the drill bit holder can be arranged in contact with each other as well. The drill bit holder according to claim 6,
The drill bit holder (22) defines a maximum axial distance between the first support part (40a) and the second support part (40b) to correspond to the drill bit (12) being handled. Drill bit holder comprising at least one adjusting member (45). The drill bit holder according to claim 6 or 7,
The first support component (40a) includes a cylindrical portion that can be disposed inside the drill bit (12), and a shoulder that can be disposed in contact with the back surface of the drill bit (12). (46) and a drill bit holder. The drill bit holder according to any one of claims 6 to 8,
The first support part (40a) and the second support part (40b) are removable parts, so that the first and second support parts are exchanged to correspond to the drill bit currently being handled. Drill bit holder characterized by being possible. Store multiple replaceable drill bits (12) in magazine (16)
Remove the connection between the drill rod (11) and the drill bit (12)
The removed drill bit (12) is carried into the magazine (16) by a transfer device (18),
Using the transfer device (18), a new drill bit (12) is removed from the magazine and carried to the drilling center (C),
In a drill bit changing method in a rock drilling apparatus, which connects a drill rod (11) to the new drill bit (12),
Inside each drill bit (12), a protruding drill bit holder (22) that is a separate part from the magazine (16) is disposed,
Each drill bit (12) to be replaced is handled only by acting on the drill bit holder (22) during transport and storage,
Before the drill rod (11) and the drill bit (12) are connected to each other, the drill bit holder (22) is removed from the drill bit (12). The method of claim 10, wherein
A method of supporting the drill bit holder (22) against an internal connection screw (41) of a hole (23) of the drill bit (12). The method according to claim 10 or 11,
Storing at least a plurality of drill bits (12) having different outer dimensions and shapes in the magazine at the same time;
A method characterized in that the various drill bits (12) are supported in the magazine (16) by means of drill bit holders (22) similar to each other.

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