JP4870694B2 - Rod changer for drilling machine - Google Patents

Description

  In the present invention, when drilling a long hole, such as when installing a long rock bolt to reinforce the rock surface of a wall in tunnel excavation work, the rod of the drilling machine is added and recovered. The present invention relates to a rod exchanging device for drilling machines.

  In a drilling machine such as a drill jumbo or a fan cut drill, a shank rod 24 is inserted into a drifter (drilling device) 22 mounted on the guide shell 20 as illustrated in FIG. A rod 50 having a predetermined length is connected to the shank rod 24 via a sleeve or the like. A bit (not shown) is attached to the tip of the connected rod 50, and the bit and rotation are transmitted from the drifter 22 to the bit, and a feed mechanism is fed to the drifter 22 to form a desired hole in the rock. To do.

  Here, when performing a long hole drilling hole whose length is longer than that of the rod, a rod exchanging device is used in the middle of the drilling hole (see, for example, Patent Documents 1 and 2). This type of rod exchanging device includes a rod holding device. For example, the rod exchanging device 100 shown in FIG. 6 includes a rod holding device 120 that is disposed on a support shaft 105 parallel to the guide shell 20 and has a pair of rod holding portions 12F and 12R that are separated from each other in the front-rear direction. Yes.

Each rod holding portion 12F, 12R of the rod holding device 120 has a tooth 14 for gripping the rod 50 and a hydraulic cylinder 13 for opening and closing the tooth 14, and uses the rotation and feed mechanism of the drifter 22 Then, the rod 50 to be connected can be screwed and threaded, and the rod 50 to be connected can be added by the rod holding device 120. When the target drill hole length is reached and the drill hole is finished, the rod 50 is again connected. The rod 50 that has been added using the holding device 120 is cut off, and the rod can be recovered.
JP 59-138893 A JP 2001-323770 A

  However, in the conventional rod exchanging device, when the rod is added or recovered by the rod holding device, if the operation is wrong, the rod holding device receives the axial load received from the feed mechanism of the drilling device. There has been a problem of causing deformation and breakage. In addition, when the rods to be connected are added or collected, it is necessary to simultaneously rotate and feed the drilling device in accordance with the helical shape of the shank rod, which is troublesome. In addition, when the rod is added or recovered, the rotation of the drilling device and the feed mechanism are out of synchronization, and if the rod does not match the spiral shape, smooth addition is difficult.

  Furthermore, when storing the added rod, if the holding position in the axial direction for holding the rod in the rod holding device is wrong, the rod is inserted into a magazine (reference numeral 18 in the example of FIG. 6) for storing the rod. May interfere with each other, and in order to prevent such interference, it is necessary to correct the holding position again. Therefore, there is a problem that extra work time is required. For such problems, conventionally, in order to avoid enormous deformation and breakage, a damaged part that is relatively easy to repair was prepared in advance, or the fundamental mechanical strength was improved, Repair work occurred, leading to increased running costs and increased mass.

  Accordingly, the present invention has been made paying attention to such problems, and the load in the axial direction that the rod holding device receives from the feed mechanism or the like of the drilling device during the rod addition or recovery operation. It is an object of the present invention to provide a drilling rod exchanging device that relieves the load even when it is received, and automatically returns to its original position when released from the load.

  In order to solve the above-mentioned problems, the present invention is used in a drilling machine, and is provided on a spindle parallel to a guide shell on which a drilling device is mounted, and a pair of rod holders that are separated from each other in the front-rear direction. A rod exchanging device including a rod holding device having a portion, wherein the pair of rod holding portions is connected to the support shaft via a load relaxation mechanism that relieves a load in an axial direction, When the load in the axial direction is received, the position of the pair of rod holding portions is slid integrally so as to relieve the load, and when released from the load, the pair of rod holding portions Is returned to the initial neutral position.

  According to the rod exchanging device for a drilling machine according to the present invention, the rod holding device includes a load relaxation mechanism for reducing the axial load that the pair of rod holding portions receives from, for example, a feed mechanism of the drilling device. Since the rod holding device receives an axial load from the feed mechanism of the drilling device, etc., when the rod is added or recovered, the load can be reduced. Can do. And when this load relaxation mechanism receives the load in the axial direction, the position of the pair of rod holding portions is slid integrally so as to relieve the load, and when released from the load Since the pair of rod holding portions are returned to the initial neutral position, when released from the load, the position of the rod holding device can be automatically returned to the original position.

  Here, in the rod exchanging device for drilling machine according to the present invention, the load relaxation mechanism, when the force of screw feed due to the helical shape of the shank rod of the drilling device acts as the axial load, The pair of rod holding portions are integrally slid by the force of the screw feed, and the movable range of the integral sliding movement is not less than the movable range in which the rod screw can be separated. preferable. With such a configuration, when connecting and disconnecting the rod, it is possible to connect and disconnect only by rotating the drilling device, and a feed operation by the feed mechanism is unnecessary. Therefore, it is suitable for improving operability. Further, since it is not necessary to adjust the rotation and the feed rate in accordance with the spiral shape of the rod, it is suitable for avoiding troubles associated therewith.

Further, in the drill excavator rod exchanging device according to the present invention, a pair of urging means are provided between the pair of rod holding portions and opposed to both sides in the axial direction. It is preferable that the biasing means hold the pair of rod holding portions in the neutral position by maintaining a balance by pressing with biasing forces from both sides in the axial direction.
Such a configuration is suitable for making the load relaxation mechanism compact.

Further, in the drill excavator rod exchanging device according to the present invention, the rod exchanging device further includes a rod guide portion that guides both the front and rear ends of the rod held by the rod holding device, and each rod guide portion, when storing the rod, The rod held by the rod holding device receives the load in the axial direction, and holds the pair of rod holding portions when the positions of the pair of rod holding portions are slid and moved together so as to relieve the load. It is preferable to have a guide surface for guiding the rod to an appropriate storage position to be accommodated in a rod storage device attached to the rod exchange device.
In such a configuration, when the rod is accommodated in the rod storage device attached to the rod exchange device, the rod storage device is operated by the operating force of the rod holding device itself and the action of the guide surface of the rod guide portion. The axial position of the rod can be automatically corrected to the appropriate retracted position to be accommodated. Therefore, it is more suitable for further improving workability.

  As described above, according to the drill excavator rod exchanging device according to the present invention, the rod holding device receives the axial load received from the feed mechanism of the drilling device or the like when the rod is added or recovered. However, it is possible to relieve the load and automatically return to the original position when released from the load.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. In addition, the same code | symbol is attached | subjected and demonstrated about the structure similar to the conventional drilling machine illustrated in the said FIG.
FIG. 1 is an explanatory view of a drilling machine provided with a rod exchanging device according to an embodiment of the present invention. FIG. 1 (a) is a front view of the main part, and FIG. 1 (b) is a plan view. FIG. 2 is a diagram for explaining a rod holding device of the rod exchanging device. FIG. 2 (a) is a plan view of the main part thereof. In FIG. 2, the load relaxation mechanism portion includes the axis of the support shaft. The figure is shown in a longitudinal section, and FIG. 5B is a sectional view taken along line AA in FIG.

  As shown in FIG. 1, in this drilling machine, a drifter (drilling device) 22 is mounted on a guide shell 2 supported by a tip end portion of a boom (not shown). The drifter 22 is moved in the front-rear direction (left-right direction in FIG. 1B) along the guide shell 2 by a known feed mechanism (not shown). A shank rod 24 is inserted into the drifter 22. A rod 50 having a predetermined length is connected to the tip of the shank rod 24 via a sleeve or the like, and a bit (not shown) is attached to the tip of the rod 50.

In addition, a foot pad 15 and a centralizer 16 are provided at the distal end portion of the guide shell 2, and the centralizer 16 supports the distal end portion of the rod 50 on the hole axis CX. Then, the hitting and rotation are transmitted from the drifter 22 to the bit via the rod 50, and a drilling hole is formed in the rock by feeding the drifter 22 with a feeding mechanism.
In this drilling machine, a rod exchanging device (rod changer) 10 is provided on the side portion of the guide shell 2 via a pair of brackets 26 that are separated from each other in the front-rear direction. When the length of the rod 50 is longer, the rod 50 can be added and recovered during the drilling operation.

  Specifically, in the rod exchanging device 10, a frame 28 is pivotally supported by a pair of front and rear brackets 26 with pins 27. The pair of frames 28 can be rotated around the pin 27 by expansion and contraction of the swing cylinder 30, so that the center position of the rod 50 to be added or recovered is on the retracted position and the drill axis CX shown in FIG. Can be moved to. The pair of front and rear frames 28 are connected by a support shaft 5 parallel to the guide shell 2 via front and rear carrier shafts 29, and the rod holding device 12 is disposed on the support shaft 5. The rod holding device 12 can be rotated around the front and rear carrier shafts 29 by the expansion and contraction of the slide cylinder 32, whereby the rod holding device 12 can be added and recovered to the retracted position and the retracted position of the rod storage device 18 shown in FIG. 1. The center position of the rod 50 to be moved can be moved.

Hereinafter, the rod holding device 12 will be described in more detail.
The rod holding device 12 is disposed on the support shaft 5 parallel to the guide shell 20 on which the drifter 22 is mounted. And it has the front rod holding | maintenance part 12F and back rod holding | maintenance part 12R which are mutually spaced apart from front and back, and are comprised. Each of the pair of rod holding portions 12F and 12R includes a tooth 14 for holding the rod 50 at the tip, and each tooth 14 is opened and closed by the expansion and contraction of the holding cylinder 13 to hold the rod 50 to be added or recovered. It is supposed to be. The pair of rod holding portions 12F and 12R are coupled to the support shaft 5 via a load relaxation mechanism 1 that relieves an axial load that the rod holding device 12 receives from a feed mechanism or the like of the drifter 22.

  Here, as shown in FIG. 2, the support shaft 5 is integrally formed by connecting the front guide shaft 5 </ b> F and the rear guide shaft 5 </ b> R to each other by the connection shaft 4. A substantially cylindrical front spring case 2F and rear spring case 2R are fitted on the support shaft 5 from the outside, and the front spring case 2F and the rear spring case 2R are mutually connected by a slider 3. It is connected to.

  The slider 3 has a substantially cylindrical shape, and four rectangular splines (female splines) having a rectangular cross section are formed along the axial direction on the inner peripheral surface thereof. The connecting shaft 4 is fitted inside the slider 3, and this connecting shaft 4 is a rectangular spline (male spline) that is complementary to the four rectangular splines (female splines) of the slider 3. ) In the outer shape and are inserted while being spline fitted to each other (see FIG. 2B). As a result, the rod holding device 12 does not rotate in the circumferential direction of the support shaft 5 due to the square splines of the slider 3 and the connecting shaft 4, but only in the axial direction of the support shaft 5. , 12R can be integrally slidably moved.

  Further, inside the front spring case 2F and the rear spring case 2R, as a biasing means, a front spring 6F and a rear spring 6R, which are cylindrical coil springs, are provided between the pair of rod holding portions 12F and 12R and a support shaft. A pair of 5 is provided opposite to both sides in the axial direction. Further, a front restriction piece 8F and a rear restriction piece 8R are accommodated in the respective spring cases 2F, 2R.

  The front spring 6F and the rear spring 6R are accommodated in the spring cases 2F and 2R in a state where a predetermined preload is applied. The pair of springs 6F, 6R is in a neutral position (in this example, centered) by maintaining a balance by pressing with the urging forces from both sides of the support shaft 5 in the axial direction. Position). Here, the predetermined preload of the front spring 6F and the rear spring 6R is set so that the total mass of the movable part including the rod holding device 12 and the rod 50 held thereby is not less than the force for maintaining the neutral position. ing.

  Further, the front guide shaft 5F and the rear guide shaft 5R are respectively provided with a front stopper 7F and a rear stopper 7R as flanges protruding in the circumferential direction at predetermined positions in the axial slide movement range. Thereby, the slide movement of the rod holding device 12 is given a movable region in which the movement range is regulated within a predetermined range in the axial direction. Here, it is desirable that the movable region is longer than the screw length of the rod end portion in consideration of the operability of the rod addition and recovery operation, and in the example of the present embodiment, the slide movement of the rod holding device 12 is performed. The movable range (stroke) to be performed is set to be greater than the movable range in which the screw of the rod 50 can be separated, and slides within a range that does not exceed the allowable deflection amount of the front spring 6F and the rear spring 6R. The movable range to be moved is set.

  Further, as shown in FIG. 1, the rod exchanging device 10 includes rod guide portions 9 </ b> F and 9 </ b> R that guide both front and rear ends of the rod 50 held by the rod holding device 12. Each rod guide portion 9F, 9R is paired so that when the rod 50 is retracted, the rod 50 held by the rod holding device 12 receives the axial load of the support shaft 5 and relieves the load. When the positions of the rod holding portions 12F and 12R are slid, the guide for guiding the holding rod 50 to an appropriate storage position to be accommodated in the rod storage device 18 attached to the rod exchange device 10 It has a surface 9m.

  With the above configuration, the rod holding device 12 having the load relaxation mechanism 1 is not applied with a load exceeding the compression force applied as a predetermined preload to the cylindrical coil spring of either the front spring 6F or the rear spring 6R. As long as the above-described neutral position of the rod holding device 1 is maintained. On the other hand, when an axial load received from the feeding mechanism of the drifter 22 or the like is applied to the rod holding device 12, the load exceeds the compressive force applied as a predetermined preload to one of the cylindrical coil springs. When the load is applied, the rod holding device 1 can slide integrally in the axial direction of the support shaft 5 to the movable region regulated by the front stopper 7F, the rear stopper 7R, and the like. The load is reduced by sliding the portions 12F and 12R in the axial direction of the support shaft 5, and when released from the load, the pair of rod holding portions 12F and 12R is acted upon by the action of the pair of springs 6F and 6R. Can be returned to the neutral position.

Next, the operation | movement of this rod replacement | exchange apparatus, an effect | action, and an effect are demonstrated with reference to FIG.1, FIG.2 and FIGS. 3-5 suitably.
When drilling is performed with this drilling machine, the guide shell 2 is moved to the drilling position by the boom, and then the drifter 22 is driven to drill. When the required drilling length is longer than the length of the rod 50, the rod 50 is drilled by the rod exchanging device 10 after the rod 50 is drilled.

The rod 50 is added by the rod changer 10 according to the following procedure.
First, the drifter 22 is blanked and the screw at the connecting portion between the shank rod 24 and the rear end of the rod 50 of the drifter 22 is loosened. Next, the front rod 50 is clamped by the centralizer 16, the drifter 22 is reversed, and the screw at the connecting portion between the shank rod 24 and the rear rod 50 is disconnected. Thereafter, the drifter 22 is moved backward on the guide shell 2.

  Next, the rod 50 to be added is gripped at the retracted position, the frame 28 of the rod exchanging device 10 is rotated, and the rod 50 is moved from the retracted position onto the hole axis CX. When the rod 50 to be added is positioned on the drill axis CX, the drifter 22 is rotated forward to connect the shank rod 24 and the screw at the rear end of the rod 50, and the holding cylinder 13 of the tooth 14 is slightly reduced. Thus, the rod 50 held by the pair of rod holding portions 12F and 12R is held so as to be rotatable, and the screw at the front end of the rear rod 50 is connected to the screw at the rear end of the front rod 50. And after connecting the rod 50, the tooth 14 of a pair of rod holding | maintenance part 12F, 12R is opened, the flame | frame 28 is rotated and it returns to a retracted position.

  Here, in the conventional rod exchanging device, it is necessary to move the drifter 22 forward by the feed mechanism while rotating the drifter 22 forward. When the screw feed force due to the helical shape of the shank rod 24 of the drifter 22 is applied as a load in the feed direction of the drifter 22, the pair of rod holding portions 12F and 12R are slid integrally in the axial direction by the screw feed force. Therefore, when the rod 50 is connected, the rod 50 can be connected only by the rotation operation of the drifter 22, and the feeding operation by the feeding mechanism is unnecessary.

Then, drilling is performed again, and when the predetermined drilling length is reached, the rod 50 is recovered. The rod 50 is collected in the following procedure.
First, the drifter 22 performs blanking to loosen the screw at the connecting portion of the rod 50. Next, the drifter 22 is retracted by a distance corresponding to one rod 50. Next, the tooth 14 of the pair of rod holding portions 12F and 12R is moved on the drill axis X, and the rear rod 50 is held. Next, the drifter 22 is slightly rotated forward so that the screw of the shank rod 24 is lightly tightened. Then, the tooth 14 of the pair of rod holding portions 12F and 12R is set in a state where the holding cylinder 13 is slightly extended, and the rear rod 50 Is held to the extent that it can be rotated (half clamp), and the rear end portion of the front rod 50 is clamped by the centralizer 16.

  Next, the drifter 22 is reversed and retracted, and first, the screw at the front end of the rear rod 50 is separated from the rear end of the front rod 50. Next, alignment is performed by moving the drifter 22 back and forth, and the rear rod 50 is firmly held by the pair of rod holding portions 12F and 12R. Next, the drifter 22 is reversed and the shank rod 24 of the drifter 22 is separated from the rear end of the rear rod 50. At this time, according to the rod exchanging device 10, when the screw feeding force due to the helical shape of the shank rod 24 of the drifter 22 is applied, the load relaxation mechanism 1 causes the pair of rod holding portions 12 </ b> F by the screw feeding force. , 12R can be slid together. Since the movable range of the slide movement is more than the movable range in which the rod screw can be separated, the shank rod 24 of the drifter 22 is separated from the rear end of the rear rod 50 only by rotating the drifter 22. be able to. Then, when the disconnection is made, the drifter 22 is moved backward, and then the frame 28 of the rod exchanging device 10 is rotated to move the rod 50 from the hole axis line X to the retracted position. Collect and finish collection.

According to this rod exchanging device 10, the rod holding device 12 is a load that reduces the axial load that the pair of rod holding portions 12F, 12R receives from the feed mechanism of the drifter 22, etc., as shown in FIG. Since it is connected to the support shaft 5 via the relaxation mechanism 1, the rod holding device 12 receives the load in the axial direction of the support shaft 5 from the feed mechanism of the drifter 22 or the like when the rod 50 is added or recovered. However, the load can be reduced.
Then, when the load relaxation mechanism 1 receives a load in the axial direction of the support shaft 5, that is, a load in the feed direction of the guide shell 20, the position of the pair of rod holding portions 12 </ b> F and 12 </ b> R Since it has a movable region that slides integrally in the feed direction, it can be moved so as to relieve the load, and even when a load is applied from the drifter 22 or the like when the rod 50 is added and recovered, it can be released.

  That is, as shown in FIG. 3, when a load is applied from the front to the rear in the feed direction of the guide shell 20, the position of the pair of rod holding portions 12 </ b> F and 12 </ b> R is changed to a movable region behind the feed direction of the guide shell 20. In such a range, it is possible to slide integrally so as to reduce the load. Further, as shown in FIG. 4, when a load is applied from the rear to the front in the feed direction of the guide shell 20, the position of the pair of rod holding portions 12 </ b> F and 12 </ b> R is changed to a movable region in the forward direction of the guide shell 20 in the feed direction. In such a range, it is possible to slide integrally so as to reduce the load.

  Therefore, deformation and breakage of the rod holding device 12 can be avoided. Therefore, the operation stop time and cost for repairing the rod holding device 12 can be suppressed. When the load is released from the load, the pair of rod holding portions 12F and 12R is returned to the initial neutral position. Therefore, when the load is released from the load, the position of the rod holding device 12 is returned to the original position. It can be automatically returned to the position.

  Further, according to this rod exchange device 10, the load relaxation mechanism 1 is actuated by the screw feed force due to the helical shape of the shank rod 24 of the drifter 22 as the axial load (load in the feed direction of the guide shell 20). When the rod 50 and the shank rod 24 are separated from each other, the pair of rod holding portions 12F and 12R can be slid together to relieve the axial load. In addition, the rod 50 can be separated only by the rotation operation of the drifter 22, and the feeding operation by the feeding mechanism is unnecessary. Therefore, operability can be improved. Further, since it is not necessary to adjust the rotation and the feed rate in accordance with the spiral shape of the rod 50, it is possible to avoid troubles associated therewith.

  Further, according to the rod exchange device 10, the load relaxation mechanism 1 slides the pair of rod holding portions 12 </ b> F and 12 </ b> R integrally in the axial direction of the support shaft 5 when receiving the axial load. Thus, the load is relieved and, when released from the load, the pair of rod holding portions 12F and 12R are returned to the neutral position by the action of the pair of springs 6F and 6R as biasing means. And the load relaxation mechanism 1 can be made into a compact structure. Further, a pair of urging means is provided between the pair of rod holding portions 12F and 12R and opposite to both sides in the axial direction of the support shaft 5, and the pair of springs 6F and 6R is connected to the support shaft 5 with each other. Since the pair of rod holding portions 12F and 12R are held in the neutral position by maintaining a balance by pressing with the urging force from both sides of the shaft in the axial direction, the load relaxation mechanism should be made more compact. Is possible.

Furthermore, according to the rod exchanging device 10, the rod guides 9F and 9R for guiding the front and rear ends of the rod 50 held by the rod holding device 12 are further provided. The rod guides 9F and 9R When retracting, the position of the pair of rod holding portions 12F and 12R is moved so that the rod 50 held by the rod holding device 12 receives the axial load of the support shaft 5 and relieves the load. 1 has a guide surface 9m for guiding the holding rod 50 to an appropriate storage position to be accommodated in the rod storage device 18 attached to the rod exchange device 10, for example, as shown in FIG. When the front end portion of the rod 50 comes into contact with the rod guide portion 9F, the position of the rod 50 in the axial direction is automatically moved by sliding backward as shown in FIG. It can be positive to. Therefore, when the rod 50 is accommodated in the rod storage device 18, an appropriate force to be accommodated in the rod storage device 18 due to the operating force of the rod holding device 12 itself and the action of the guide surfaces 9 m of the rod guide portions 9F and 9R. Since the axial position of the rod 50 can be automatically corrected to the retracted position, workability can be further improved.
The rod exchanging device according to the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

It is explanatory drawing of the drilling machine provided with the rod exchange apparatus which is one Embodiment of this invention, The figure (a) is the front view, (b) is a top view. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the rod holding | maintenance apparatus of the rod exchange apparatus which is one Embodiment of this invention, The same figure (a) is a top view of the principal part, and the longitudinal cross-section including the axis line of a spindle in the part of a load relaxation mechanism (B) is a cross-sectional view taken along the line AA in FIG. It is a figure explaining the state which the load acted on the rod holding | maintenance apparatus which is one Embodiment of this invention toward the axial direction back. It is a figure explaining the state which the load acted on the rod holding | maintenance apparatus which is one Embodiment of this invention toward the axial direction front. When accommodating a rod in the rod storage device which is one embodiment of the present invention, it is a figure explaining the example where load acted toward the direction of the axis back. It is a figure explaining an example of the drilling machine provided with the conventional rod exchange apparatus, The figure (a) is the front view, (b) is a top view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Load relaxation mechanism 2F Front spring case 2R Rear spring case 3 Slider 4 Connection shaft 5 Support shaft 5F Front guide shaft 5R Rear guide shaft 6F Front spring 6R Rear spring 7F Front stopper 7R Rear stopper 8F Front regulation piece 8R Rear regulation piece 9F Rod Front guide portion 9R Rod rear guide portion 10 Rod exchange device 12 Rod holding device 12F Front rod holding portion 12R Rear rod holding portion 13 Holding cylinder 14 Tooth 15 Foot pad 16 Centralizer 18 Magazine (rod storage device)
20 Guide shell 22 Drifter (drilling device)
24 Shank rod 26 Bracket 27 Pin 28 Frame 29 Carrier shaft 30 Swing cylinder 32 Slide cylinder 50 Rod

Claims (1)

A rod used in a drilling machine and disposed on a support shaft parallel to a guide shell on which the drilling device is mounted, and holding a midway part of the rod to be replaced by a pair of rod holding parts spaced apart from each other in the front-rear direction A holding device, a magazine that is arranged to support both ends of the rod and accommodates the rod, and a front and rear both ends of the rod that is attached in the vicinity of the rod receiving port of the magazine and is held by the rod holding device A rod exchanging device comprising a rod guide for guiding to the mouth ,
The pair of rod holding portions is connected to the support shaft via a load relaxation mechanism that relieves an axial load, and the load relaxation mechanism receives the load in the axial direction. The position of the rod holding part is integrally slid so as to relieve the load, and when released from the load, the pair of rod holding parts is returned to the initial neutral position ,
The load relaxation mechanism integrally slides the pair of rod holding portions by the screw feeding force when a screw feeding force due to the helical shape of the shank rod of the drilling device is applied as the axial load. and adapted to move the movable range to be slid in its integral state, and are more movable range that can be disconnected threaded rod,
A pair of urging means is provided between the pair of rod holding portions and opposite to both sides in the axial direction, and the pair of urging means is provided by urging forces from both sides in the axial direction. The pair of rod holders are held in the neutral position by maintaining a balance by pressing ,
Each rod guide portion, when storing rods, the rods held by a rod holding device receives the load of the axial direction the position of the pair of rod holding portion to alleviate the load when it is slid integrally, that the held drilling machine rod changer, wherein each having a guide surface comprising a slanted surface for guiding the rod receiving opening of the magazine rod.

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