CN102066691B - Drill bit magazine, drill bit holder, and method for changing drill bit in rock drilling unit - Google Patents

Abstract

The invention relates to a bit magazine, a bit holder and a method for changing a bit in a rock drilling unit. The bit magazine (16) has a plurality of spaces (30), each space arranged to receive a bit holder (22). The bit (12) is supported into the bit magazine by the bit holder. Furthermore, the transfer between the bit magazine and the holder (14) takes place by acting only on the bit holder. The drill bit holder is a protrusion which bears against at least one inner side surface (41) of the drill bit.

Description

Bit magazine, bit holder and method for changing a bit in a rock drilling unit

technical field

The present invention relates to a drill bit magazine in which replaceable drill bits for rock drilling machine tools can be stored. A drill bit can be fastened to a drill rod belonging to the tool by means of a bit changer. The drill magazine has a plurality of spaces for storing drill bits and a movable frame portion, and in order to take out drill bits from the drill magazine and bring one drill bit into the drill magazine, each space supporting the drill bits can be arranged one at a time to the drill magazine in the replacement bit.

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

Background technique

The subject-matter of the invention is described in more detail in the preambles of the independent claims.

In rock drilling, a rock drilling machine is used with a tool attached to it that is rotatable about its longitudinal axis and through which shock pulses can be sent to the rock being drilled, causing the rock to fracture and form the drilled rock. hole. The tool may include one or more drill rods and a replaceable drill bit connected to the outermost ends of the drill rods. Typically, the front end of the drill bit is equipped with a plurality of bit buttons that penetrate the drilled rock. Since very high loads are directed at the drill bit during drilling, the drill bit is subject to wear and occasionally damage. Thus, it is necessary to replace the drill bit from time to time in order to ensure the quality and efficiency of drilling. Manually changing drill bits by an operator is difficult, slow, and worst of all, dangerous. Accordingly, bit changers have been developed to mechanize the change. However, existing ways of storing and manipulating drill bits do not fully meet the needs of users. For example, US publication 4 065 845 discloses a drill bit changer in which a drill bit is arranged against a space in a drill bit magazine, which sets limits on the shape and size of the drill bit.

Contents of the invention

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

The drill bit magazine of the present invention is characterized in that each space in the drill bit magazine is arranged to detachably receive and connect a separate drill bit holder, each stored drill bit is arranged to be supported into the drill bit magazine by the drill bit holder, And the bit holder bears against at least one inside surface of the bit.

The drill holder of the present invention is characterized in that the drill holder is a separate protruding part which can bear against at least one inside surface of the drill bit, and that the drill holder comprises grips for manipulating and fastening the drill bit holder part.

The method of the invention is characterized in that a protruding drill holder is arranged inside each drill, which is a separate piece from the drill magazine, and that each replaced drill is manipulated during transfer and storage by affecting only the drill holder. the drill bit and remove the bit holder from the drill bit before the drill rod and bit are connected to each other.

The idea of the invention is that a protruding drill holder is arranged inside the drill to bear against at least one inner side surface of the drill during storage and transfer of the drill. Then the outer surface of the drill does not have to be disturbed during storage in the drill magazine and transfer between the drill magazine and the holder. The bit holder is an adapter between the bit and the bit magazine and between the bit and the transfer device. However, the bit holder does not participate in securing the bit to the tool, but may act as a detachable and independent transfer and storage adapter.

The invention offers the advantage that drill bits of different shapes and dimensions can be stored and handled without difficulty by means of the drill holder. The same bit magazine and transfer device can then be used to handle different bits. This increases the functional adaptability of the drill bit changer for use with different drill bits. This in turn achieves cost savings since it is possible to manufacture a universal magazine and transfer device that can be widely used in rock drilling equipment designed for various drilling situations. Another advantage is that it is easier to arrange the drill in the desired position with the holder, since the outer circumference of the drill has no gripping means of the transfer means or the like.

The idea of an embodiment is that the frame part of the bit magazine is a disc provided with a plurality of fastening holes, each of which is arranged to receive a bit holder. Each fastening hole opens toward the outer periphery of the disc-shaped frame portion. The drill holder includes a fastening portion having a fastening groove such that the drill holder can be supported to the fastening hole by the groove and can be moved on a replacement position in a radial direction of the disc-shaped frame portion. In addition, the drill holder is prevented from moving away from the fastening space in the direction of the radius of the frame portion when the drill holder is not at the replacement position. The disc-shaped frame portion of the bit magazine is rotatable relative to the axis of rotation for moving the bit holder relative to the changing position.

The idea of an embodiment is that the drill bits stored in the drill bit magazine are supported to the frame of the drill bit magazine individually by means of drill bit holders.

The idea of an embodiment is that the bit holder has a clamping portion with which the individual bit holder is detachably fastened to the bit magazine. In addition, the drill bit holder can be transferred between the drill bit magazine and the drilling center by clamping the clamping portion with the transfer device.

The idea of an embodiment is that the clamping part of the drill holder is at the free end of the holder.

The idea of an embodiment is that the bit holder comprises an elongated arm having a cylindrical clamping portion on part of its first end. The clamping part has a longitudinal hole into which a transfer pin belonging to the transfer means of the bit changer can be pushed for attachment to the bit changer. In addition, the outer surface of the clamping portion has a circumferential fastening groove by which the bit holder can be fastened to the bit cartridge.

The idea of an embodiment is that the drill bit holder comprises an elongate arm and at least two supports arranged to bear themselves against the inner connecting thread of the drill bit. The first support is arranged movable relative to the arm, while the second support is fixedly arranged relative to the arm on the outermost end of the arm. Then by moving the arm relative to the first support, the supports can be placed at an axial distance from each other and correspondingly abut each other.

The idea of an embodiment is that the drill bit holder comprises at least one adjustment member for setting the maximum axial distance between the first support and the second support to correspond to the drill bit being manipulated. Through adjustment, drill bits of different lengths can be placed in the drill bit chamber so that the front ends of the drill bits are substantially at the same height as each other. The front end of the drill can then be supported in the drill cartridge in the axial direction against a suitable support plate or the like, whereby the drill will not separate from the drill holder even if the drilling device and drill cartridge are guided downwards. Additionally, when the noses of the drill bits are adjusted to be substantially level with each other and when the drill bit cartridge is at the holder, the transfer of the drill bit between the holder and the drill bit cartridge can be done using a simple traverse linear movement.

The idea of an embodiment is that the first support of the drill bit holder comprises a cylindrical portion arrangeable inside the drill bit and a shoulder portion arrangeable against the rear surface of the drill bit.

The idea of an embodiment is that the top of the drill holder is arranged to bear itself against the bottom of the hole in the drill and support the drill in axial direction. Thus, one support of the bit holder may be arranged to handle the axial support, while the other support may be arranged to support the bit so that it is parallel to the bit holder.

The idea of an embodiment is that the first and the second support of the bit holder are separable pieces, whereby they are replaceable to correspond to the bit being manipulated each time.

The idea of an embodiment is to simultaneously store and handle at least two different drill bits that differ from one another in terms of external dimensions or shapes with the drill bit changer. The different bits are supported into the bit magazine by similar bit holders. Even completely different drill bits for special drilling situations can be stored in the drill magazine without structural changes.

The idea of an embodiment is to have a form-lock between the drill holder and the clamping member of the transfer device. This form locking is released when the bit holder is inserted into the bit magazine. Form-locking ensures a good fastening. The movement of the shape-locking member to the open position can be done mechanically when the transfer device is moved towards the drill cartridge, and the shape-locking member can be moved back into the locked position by the spring member when the transfer member is moved away from the drill cartridge.

The idea of an embodiment is that the form-locking member between the drill holder and the clamping member of the transfer device has in the clamping member at least one spring locking device which is arranged to be seated in at least one of the drill holders. locking groove or corresponding locking notch. Means for stopping bending of the spring locking device away from the locking notch, ie for strengthening the spring locking device, may be located in the clamping member.

Description of drawings

Some embodiments of the invention will be described in more detail in the accompanying drawings, in which:

Fig. 1 is a schematic side view of a rock drilling rig having a drilling arrangement equipped with a holder and a bit changer attached to the holder,

Figures 2a to 2c are schematic perspective views of the drill bit, while Figure 2b also shows the clamping with the hole in the drill bit,

Figure 3 is a schematic top view of the operation of the bit changer,

Fig. 4 is the schematic diagram of drill bit chamber,

Figure 5 is a schematic, partial section detail of the bit cartridge of Figure 4,

Figure 6 is a schematic side view of a possible form-locking between the clamping member of the transfer device and the bit holder,

Figure 7 is a schematic, partially cut-away side view of a clamping member of a transfer device,

Figures 8a and 8b are schematic top views of the locking principle of the clamping member according to Figure 7, and

Figures 9a and 9b show schematic, cross-sectional side views of another arrangement for locking the clamping member to the bit holder by expanding the mechanical element.

In the figures, some embodiments of the invention are shown simplified for clarity. Similar components are labeled with the same reference numerals in the figures.

Detailed ways

The rock drilling rig 1 shown in Figure 1 comprises a movable carrier 2 on which one or more drilling arms 3 are arranged, said drilling arms 3 having a drilling arrangement 4 at their outermost ends . The drilling device 4 comprises a feed beam 5 supporting a rock drilling machine 6 which is movable in a drilling direction A and in a counter direction B by means of a feed device 7 . In the figure, the dotted line marks the drilling line, ie the drilling center C. The rock drilling machine 6 may comprise an impact device 8 for providing impact pulses to a tool 9 connected to the rock drilling machine 6 . Furthermore, the rock drilling machine 6 may comprise a rotation device 10 for rotating the tool 9 about its longitudinal axis. During drilling, the tool 9 is in the drilling center C and may comprise a drill rod 11 having a replaceable drill bit 12 at its outermost end. Furthermore, in so-called extension rod drilling, a plurality of drill rods 11 are connected continuously to drill a long hole 13 . When drilling into rock, the bit buttons or corresponding parts of the rock-cutting drill bit 12 wear and may be damaged, which is why the drill bit 12 is changed during drilling. Furthermore, different kinds of drill bits for various drilling situations and rock conditions are available to improve rock drilling and drilling quality. The drill bit 12 is usually connected to the drill rod 11 using a threaded connection.

At the front end of the feed beam 5, ie in the outermost part of the feed beam 5, as seen in the drilling direction A, there is a holder 14 comprising clamps or corresponding holding members, at least for In case the drill rod is rotated by means of the rotating device 10 of the rock drilling machine 6 to open or close the threaded connection between the drill rod 11 and the drill bit 12 , the replaceable drill bit 12 can be fixedly fastened by means of the clamp or holding member. The holder 14 can be positioned in such a way that the held tool 9 is in the drilling center C. The structure of the holder 14 can be configured in various ways.

Furthermore, on the front edge of the feed beam 5, a bit changer 15 is arranged in association with the holder 14, and this bit changer 15 comprises a bit magazine 16, in which a required number of drill bits, usually 5 to 10, can be stored. In the drill bit bin 16. The bit magazine 16 may be a rotating disk in which a space for supporting the drill bits 12 to be stored is formed. Alternatively, bit magazine 16 may be a chain magazine or any other suitable configuration having a plurality of corresponding spaces. Furthermore, the drill bit changer 15 may comprise one or more stop members 17 , with which the drill bit 12 can be mechanically stopped at a predetermined axial position in the drilling center C . The stop member 17 can be a sliding device, for example, for replacement, the stop member 17 can be pushed from the front side of the holder 14 into the drilling center C and before the drill bit 12 is fixedly fastened with the holder 14, the The front end of the drill bit 12 is pushed against the surface of the stop member 17 on the rock drilling machine 6 side. Furthermore, the drill bit changer 15 comprises one or more transfer devices 18 with which the drill bits 12 can be transferred from the drill bit magazine 16 to the holder 14 and vice versa.

Different drill bits 12 are shown in FIGS. 2a to 2c. As can be seen from the figure, the drill bit 12 is quite different in shape. The drill bit 12 of Figure 2a has helical grooves on the outer periphery of the frame portion 12a, whereas in the drill bit 12 of Figure 2b the frame portion 12a is a smooth cylinder. Furthermore, in FIG. 2c the frame part 12a is provided with a grooved shoulder 20 . Since the profiles of different drill bits 12 may differ significantly from each other, it is difficult to manipulate the drill bit 12 at its frame portion 12a. It is necessary to make a universal holder and the like. On the other hand, gripping the tip or working part 12b at the front end of the drill bit 12 should be avoided since it is the most critical part of the drill bit and is provided with a hard, but fragile bit button 21 . However, the drill bit 12 is manipulable by means of a suitable protrusion or pin-like separate drill bit holder 22 which can be pushed into a hole 23 in the frame part 12a of the drill bit, which hole 23 is arranged to normally receive the drill rod 11 the connection part. Thanks to this bit holder 22, the drill bit 12 can be manipulated in the bit magazine 16 without risk of damaging the working part 12b during transfer.

FIG. 3 shows the bit changer 15 arranged to the holder 14 . The changer 15 may comprise a transfer device 18 which is a type of manipulator. The transfer device 18 may comprise a first transfer device 18 a and a second transfer device 18 b connected to each other by a fastener 35 . The first transfer device 18a is arranged to move the second transfer device 18b and the clamping member 36 connected to the second transfer device 18b linearly in the transverse direction E so that the drill bit 12 can be moved between the drill bit magazine 16 and the clamp 25 of the holder 14 passed between. The second transfer means 18b is arranged to move the drill bit holder 22 into and out of the bore 23 of the drill bit. The bit holder 22 is an elongate piece whose first end may include a gripping portion 38 to which the gripping member 36 of the transfer device 18 may be attached and through which the bit holder 22 is Fastened to bit housing 16. In addition, bit holder 22 may include an arm 39 to which two or more supports 40a and 40b are arranged and dimensioned to bear against themselves on connecting threads 41 when located within bore 23 of bit 12 . Additionally, the rearmost first support 40a may include a shoulder 46, flange, etc. that may rest itself on the rear surface of the drill bit 12 and support the drill bit 12 in the axial direction. When the bit holder 22 is pushed into the hole 23 by the second transfer means 18b, the first support 40a rests on the rear of the drill bit 12, while the second support 40b, which is rigidly connected to the arm 39, can be pushed further towards The front end of drill bit 12. The supports 40 a and 40 b then stop at a distance from each other, whereby the drill bit 12 is firmly supported through the surface of the hole 23 . The spaced apart supports 40a, 40b ensure that the drill bit 12 remains straight. The bit holder 22 may have an adjustment member 45, such as an adjustment screw, with which the maximum distance in the direction H between the supports 40a, 40b can be adjusted. At the same time, the adjustment member 45 affects the distance in the direction H of the clamping portion 38 from the first support 40a. Adjustment of the bit holder 22 enables the front ends of different lengths of bits 12 to stop at the same point in the bit magazine 16 because the bit 12 is supported behind it by the shoulder 46 . When the bit magazine is positioned at the holder 14 in the axial direction, and when the front end of the drill bit 12 is laid flat in the drill magazine 16, the transfer between the drill magazine 16 and the holder 14 can use the simple function of the first transfer device 18a. This is done by moving E across the line.

When the drill bit 12 is pressed between the jaws 25, the second transfer means 18b is used to pull the bit holder 22 backwards, ie in the opposite direction B, whereby the supports 40a, 40b rest on each other and are removed from the hole. 23 out. Next, the drill bit holder 22 is transferred away from the drilling center C by the first transfer device 18a, and the drill rod 11 is connected to the drill bit 12, after which the stop member 17 and the clamp 25 are opened. Normal drilling can then begin.

Furthermore, FIG. 3 shows that the drill rod 11 is transported in the drilling center C in the opposite direction B when the drill bit 12 is replaced. The front end of the drill rod 11 is provided with a connecting portion 43, which has a connecting thread 44, by which the drill rod 11 is fed along the drilling direction A while the drill rod 11 is rotated around its longitudinal axis by the rotating device 10 of the rock drilling machine 6. Turning, this connecting thread 44 can be connected to the inside connecting thread 41 of the drill bit 12 in the holder 14 . When the drill bit 12 connected to the drill rod 11 is disconnected, the stop member 17 is closed and the drill bit 12 is pushed against the stop member 17 . In this way, the drill bit 12 is always correctly positioned for the transfer device 18 and the holder 14 .

Additionally, FIG. 4 shows that the bit magazine 16 may include a disc-like frame portion 50 that is rotatable relative to the axis of rotation 29 to select the desired bit. The periphery of the frame part 50 of the bit magazine 16 has a plurality of spaces 30 into which the bit holders 22 as described in Figures 2b and 3 can be arranged in a detachable manner. By turning the frame part 50 in the direction G, each space 50 can be set one at a time into the replacement position 37, in which, by using the transfer device, the drill holder and the Possible drill bits are removed from the drill bit magazine, or alternatively, a drill bit holder can be placed via the transfer device into the vacant space 30 . The space 30 is an elongated hole that opens toward the outer periphery of the frame portion 50 . A guard portion 51 may surround the periphery of the frame portion 50 to prevent the bit holder from leaving the space 30 when the bit holder is not at the replacement position 37 .

FIG. 5 shows a detail of the drill magazine 16 according to FIG. 4 . The clamping portion 38 of the bit holder may be cylindrical and may include a circumferential fastening groove 52 by which the clamping portion 38 may be fastened to a protruding portion in the frame portion 50 of the bit magazine. Long space 30. Furthermore, the figure shows a protective part 51 which prevents the bit holder from sliding away from the space 30 in the direction of the radius of the disc-shaped frame part.

Naturally, the clamping portion 38 of the bit holder 22 can also be configured in some other way, as can the space 30 in the bit magazine and the transfer pin or corresponding clamping member 36 of the transfer device.

If the bit magazine 16 is a chain magazine, the movable chain forms its frame part provided with a plurality of fastening spaces for receiving the bit holder 22 . Correspondingly, the frame part of the bit magazine can also be of different shape and it can move linearly instead of rotationally.

It should be noted that the supports 40a, 40b of the bit holder 22 may comprise means for clamping the holes 23 of the bit so that the bit 12 will not separate from the holder 22 even if the feed beam 5 is directed downwards . The supports 40a, 40b may comprise friction members, such as buckles made of rubber or a corresponding elastic material. In addition, the bit holder 22 may have an inflatable portion which can expand under the action of a pressure medium or mechanical movement and press against the inner surface of the bore 23 of the bit 14 .

Figure 6 shows in a very simplified manner the arrangement of the clamping member 36 for securing the bit holder 22 to the transfer device. The clamping member 36 may be provided with a spring locking member 60 having a locking spike or a corresponding protrusion 61 which, in its locked position, may be located in a position belonging to the bit holder. The locking groove or corresponding locking notch 63 in the hole 62 of the clamping portion 38 of the tool 22 . This creates a form lock between each spring locking member 60 and locking notch 63 to prevent accidental disengagement of the bit holder 22 from the clamping member 36 . The spring locking member 60 may be reinforced in its locked position such that the locking protrusion 61 cannot move away from the locking notch 63 in the manner shown in dashed lines in FIG. 6 . The clamping member 36 may have means by which the locking projection 61 can be released, when desired, whereby the bit holder 22 and the clamping member 36 can be separated from each other. Instead of the spring-like locking member 60 it is of course also possible to use a rigid locking member for form-locking with a shaped surface in the hole 62 . The relative movement of the form-locking member to open and close the form-lock can be done mechanically eg due to movement of the transfer means, or alternatively it is also possible to use a pressure medium operated or electrically operated actuator to provide the necessary movement.

FIG. 7 shows the clamping member 36 comprising two spring locking members 60 fastened to a frame 64 . In addition, the clamping member has a central pin 65 arranged rotatably relative to the frame 64 . The central pin 65 is provided with a longitudinal groove 66 whereby the central pin 65 can be turned about its longitudinal axis into a position in which the groove 66 is at the spring locking member 60 . The spring lock member 60 can then enter into the groove 66, which enables the spring lock member to move away from the lock groove of the bit holder or the like. In their locked position, the spring locking members 60 bear against the outer surface of the central pin 65, whereby they cannot withdraw from the locking grooves of the bit holder. In this embodiment, the spring locking member 60 is thus reinforced in its locking position, whereby the form locking between the bit holder and the clamping member 36 is rigid. When the spring locking members 60 are at the grooves 66 and the clamping member 36 is pushed towards the clamping portion of the bit holder, the spring locking members 60 can bend and back away towards the grooves 66 until they finally enter the locking recesses of the bit holder. in the slot.

Figure 8a shows, in a very simplified manner, the groove 66 and the spring locking member 60 at different points. When the transfer means moves the clamping member 36 in the direction R, the first mating surface 67 meets the second mating surface 68 in the bit magazine 16 , which provides a rotational movement S of the central pin 65 . Thereby, the groove 66 stays at the position of the spring locking member 60, as shown in Fig. 8b. After the clamping member 46 has moved away from the bit magazine 16, the spring member may act on the center pin 65 to rotate it back to its locked position.

Figure 9a shows an arrangement in which the clamping member 36 is locked to the bit holder 22 by an expansion locking member 70, such as a rubber boot. Bit holder 22 may have a locking notch 63 or groove into which locking member 70 may be pushed sideways after turning member 71 has acted on central pin 72 and has caused squeeze sleeve 73 to squeeze locking member 70 . A port 63 or groove, as shown in Figure 9b. Between the central pin 72 and the extrusion sleeve 73 there may be a high-pitch thread 74 which converts the rotational movement of the central pin 72 into a linear movement of the extrusion sleeve 73 . The turning member 71 may function in the same way as the first mating surface 67 in Figures 8a and 8b. Of course, the rotation of the central pin 72 can also be provided with a suitable rotation device. Furthermore, the expansion locking member 70 may be a spring member, such as a spring plate, which expands sideways and into the locking recess 63 under pressure.

It should be noted that the locking scheme shown in Figures 8a to 9b is also applicable where the clamping member 36 directly clamps a drill bit or some other drilling component.

In some cases, features described in this application may be so used independently of other features. On the other hand, the features described in the present application may also be combined as necessary to provide various combinations.

The drawings and the associated description are only intended to illustrate the idea of the invention. The invention may vary in its details within the scope of the claims.

Claims (12)

1. a drill bit storehouse, a plurality of interchangeable drill bit being used in Rock penetrating can be stored in described drill bit storehouse,

And described drill bit storehouse (16) comprising:

Frame part (50) movably,

A plurality of spaces (30), each space in described space is arranged to and keeps a drill bit (12), and

At least one change bit (37), by mobile described frame part (50), each space (30) is moved to described change bit at every turn, drill bit (12) can be taken to the vacant space (30) that described change bit (37) is located thus, and drill bit (12) can be shifted out from the space (30) of described change bit (37)

It is characterized in that,

Each space (30) in described drill bit storehouse (16) is arranged in separable mode and receives and be connected an independent drill bit retainer (22),

The drill bit of each storage (12) is arranged to by described drill bit retainer (22) and supports in described drill bit storehouse (16), and

Described drill bit retainer (22) rests at least one inner surface (41) of described drill bit (12).

2. drill bit according to claim 1 storehouse, is characterized in that,

The frame part (50) in described drill bit storehouse is the discoid pieces that is equipped with a plurality of spaces (30), and each space in described space is arranged to receives a drill bit retainer (22),

Each space (30) is open towards the periphery of the described frame part (50) of plate-like,

Described drill bit retainer (22) comprises the retained part (38) with fastening groove (52), make described drill bit retainer (22) support to described space (30) and can in described change bit (37), locate mobile along the direction of the radius of the described frame part (50) of plate-like by described groove (52)

When described drill bit retainer is not when described change bit (37) is located, by least one protection member (51), prevent that described drill bit retainer (22) is mobile, and

The described frame part (50) of plate-like can rotate with respect to turning cylinder (29), for making described space (30) mobile with respect to described change bit (37).

3. drill bit according to claim 1 and 2 storehouse, is characterized in that,

The described drill bit (12) being stored in described drill bit storehouse (16) only supports to the frame part (50) in described drill bit storehouse by described drill bit retainer (22).

4. for handling a drill bit retainer for the interchangeable drill bit that is used in Rock penetrating, it is characterized in that,

Described drill bit retainer (22) is prodger independently, and described prodger is upper at least one inner surface (41) that transmits and can rest between the storage life described drill bit (12),

Described drill bit retainer (22) comprises the retained part (38) for manipulation and fastening described drill bit retainer (22), and

Before described drill bit is connected to drilling rod, described drill bit retainer (22) is removed.

5. drill bit retainer according to claim 4, is characterized in that,

Described drill bit retainer (22) comprises extension arm (39), and

First end along described arm (39) has cylindrical retained part (38),

The central axis of described retained part (38) has longitudinal hole (54), and the transfer device of bit changer (18) acts on described longitudinal hole (54), and

The external surface of described retained part (38) has circumferential fastening groove (52), and described drill bit retainer (22) can be fastened to described drill bit storehouse (16) by described circumferential fastening groove.

6. drill bit retainer according to claim 4, is characterized in that,

Described drill bit retainer (22) comprises extension arm (39) and at least two support members (40a, 40b), and described support member is arranged as the inner side connecting thread (41) that himself rests on described drill bit (12) upper,

The first support member (40a) is arranged as can be mobile with respect to described arm (39),

The second support member (40b) is fixedly placed in the outermost end of described arm (39) with respect to described arm (39), and

By making described arm (39) mobile with respect to described the first support member (40a), make described the first support member (40a) and the second support member (40b) can set the certain axial distance of mutual distance for and correspondingly abut against each other.

7. drill bit retainer according to claim 6, is characterized in that,

Described drill bit retainer (22) comprises at least one adjustment means (45), be used for setting the maximum axial distance between described the first support member (40a) and described the second support member (40b), with the drill bit corresponding to being handled (12).

8. according to the drill bit retainer described in claim 6 or 7, it is characterized in that,

Described the first support member (40a) comprises the cylindrical portion that can be arranged in described drill bit (12) and the shoulder (46) that can arrange against the rear surface of described drill bit (12).

9. according to the drill bit retainer described in claim 6 or 7, it is characterized in that,

Described the first support member (40a) and the second support member (40b) are separable, and they can be changed thus, with corresponding to each drill bit of being handled (12).

10. for changing a method for the drill bit that bores rock device,

Described method comprises:

A plurality of interchangeable drill bits (12) are stored in drill bit storehouse (16),

Being connected between drilling rod (11) and drill bit (12) separated,

By transfer device (18), the drill bit separating (12) is brought in described drill bit storehouse (16),

Utilize described transfer device (18) green bit (12) is taken out from described drill bit storehouse and it is put into the center of creeping into (C), and

Drilling rod (11) is connected in described green bit (12),

It is characterized in that,

In each drill bit (12), arrange outstanding drill bit retainer (22), described drill bit retainer (22) is the discrete item that is independent of described drill bit storehouse (16),

Transmitting and by only affecting described drill bit retainer (22), handling each drill bit being replaced (12) between the storage life, and

Before described drilling rod (11) and drill bit (12) are connected to each other, described drill bit retainer (22) is taken out from described drill bit (12).

11. methods according to claim 10, is characterized in that,

Described drill bit retainer (22) is supported to the inner side connecting thread (41) in the hole (23) in described drill bit (12).

12. according to the method described in claim 10 or 11, it is characterized in that,

Size externally or at least a plurality of different drill bits (12) of differing from one another are in shape stored in described drill bit storehouse simultaneously, and

By similar each other drill bit retainer (22), described different drill bit (12) is supported in described drill bit storehouse (16).

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