JP3654441B2 - Extension rod - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drilling device in which a drilling machine equipped with a striking mechanism and a rotation mechanism is mounted on a guide shell provided with a feeding mechanism, and a drilling device for drilling a blast hole, a rock bolt hole, or the like in the bedrock. The present invention relates to an extension rod used in connection.
[0002]
[Prior art]
When drilling a long hole of about 5m to 6m in a tunnel using a drilling machine equipped with a drilling machine on the guide shell, conventionally, it was adjusted to the drilling length of the drilling machine's shank rod. A long rod is connected and drilled, or a rod connecting device such as a rod setter or a rod changer is used to drill a plurality of rods shorter than the drilled length.
[0003]
[Problems to be solved by the invention]
However, in order to drill using a long rod as long as 5 to 6 m, it is necessary to provide a long guide shell, which increases the weight of the guide shell. For this reason, the support mechanism which supports a guide shell becomes large, and a trolley also enlarges.
In addition, when drilling a lock bolt hole in the peripheral wall of the tunnel, the entire length of the guide shell may be too long to fit in the cross section of the tunnel, and the drill hole may not be formed.
[0004]
On the other hand, when using a rod connecting device, it is not necessary to lengthen the guide shell, but the number of control devices increases, and a large number of operating levers must be operated, and sometimes a dedicated connecting rod is used. Necessary and expensive equipment.
The present invention solves the above-mentioned problem in a drilling device, and does not use a rod connecting device, and does not use a long guide shell. The purpose is to provide.
[0005]
[Means for Solving the Problems]
An extension rod according to the present invention includes an outer rod and an inner rod that is slidably inserted into the outer rod. The outer rod includes a forward rotating screw at the inner peripheral front portion and a reverse rotating screw at the inner peripheral rear portion. The rod is provided with a forward rotation male screw, a stopper, and a reverse rotation male screw at an outer peripheral front portion.
[0006]
Here, when the forward rotation of the rock drill is left rotation, the forward rotation female screw and the forward rotation male screw are left-handed screws, and the reverse rotation female screw and the reverse rotation male screw are right-handed screws. If the forward rotation of the rock drill is clockwise, the forward female screw and the forward male screw are right-handed, and the reverse female screw and the reverse male screw are left-handed.
In this extension rod, a bit is attached to the front end of the outer rod, and the rear end of the inner rod is connected to the shank rod of the rock drill through a sleeve.
[0007]
At the start of drilling, the extension rod is reduced, and the forward rotation male screw at the front of the inner rod is fastened to the forward rotation screw at the front of the outer rod.
After drilling in this state and the rock drill has moved to the front end of the guide shell, the outer rod is clamped, the drill rocker is rotated backwards and the forward male screw at the front of the inner rod is inserted into the front of the outer rod. Remove from the forward screw.
[0008]
After that, when the rock drill is rotated forward while the rocker is rotated forward, the inner rod is extracted from the outer rod and the extension rod is extended. Eventually, when the reverse male screw at the front part of the inner rod is screwed into the reverse female thread at the rear part of the outer rod and the stopper comes into contact with the reverse female thread at the rear part of the outer rod, the extension rod ends.
[0009]
When the extension rod has been extended, the outer rod clamp is released, and the rock drill is advanced again to make a hole.
When the drilling hole of a predetermined length is completed, the drilling machine is moved backward to clamp the outer rod, and the drilling machine is moved forward in reverse to disengage the inner rod's reverse male screw from the outer rod's reverse female screw.
[0010]
Then, when the rock drill is rotated forward, the guide rod is advanced on the guide shell, whereby the inner rod is inserted into the outer rod and the extension rod is reduced. When the forward male screw at the front part of the inner rod is fastened to the forward female screw at the front part of the outer rod, the extension rod is finished to be reduced.
When the extension rod has been reduced, the outer rod clamp is released, and the drilling machine is retracted to the rear end of the guide shell to finish the drilling hole.
[0011]
Thus, since the extension rod of the present invention can be expanded and contracted, a long drilling hole is possible without using a rod connecting device and using a short guide shell.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a configuration diagram of an extension rod showing an embodiment of the present invention, FIG. 2 is a side view of a drilling device showing a state in which the extension rod is connected to a rock drill, and FIG. 3 is an enlarged view of the front portion of the outer rod 4 is an enlarged view of the rear portion of the outer rod, FIG. 5 is an enlarged view of the front portion of the inner rod, and FIG. 6 is an explanatory view of the extension rod extension procedure.
[0013]
The extension rod 1 includes an outer rod 2 and an inner rod 3 that is slidably inserted into the outer rod 2.
The outer rod 2 is formed by providing a bit adapter connecting screw 5 at the front end of a hollow outer tube 4 and screwing and fixing the bit adapter 6, and fixing the outer end 7 to the rear end of the outer tube 4 by welding. A bit mounting screw 9 for mounting the bit 8 is provided at the tip of the knives, and a small hole 10 for discharging the dust is formed in the center.
[0014]
The outer rod 2 may be configured such that the bit adapter 6 is welded and fixed to the outer tube 4 and the outer end 7 is screwed and fixed. It can also be tapered.
A normal rotation screw 11 is provided on the inner periphery of the bit adapter 6, and a reverse rotation screw 12 is provided on the inner periphery of the rear end of the outer tube 4. The outer end 7 is provided with a dust seal 13 for preventing dust from entering from the outside and an O-ring 14 for preventing water leakage.
[0015]
A forward rotation male screw 15 is provided on the outer periphery of the front end of the inner rod 3, followed by a stopper 16 and subsequently a reverse rotation male screw 17. The stopper 16 is smaller in diameter than the inner diameter of the outer rod 2, but larger in diameter than the valley diameter of the reverse rotation female screw 12, and prevents the inner rod 3 from slipping out from the outer rod 2.
A connection screw 21 for connecting to the shank rod 19 of the rock drill 18 via the sleeve 20 is provided on the outer periphery of the rear end of the inner rod 3.
[0016]
The extension rod 1 is assembled in the following procedure.
First, the dust seal 13 and the O-ring 14 are assembled at the rear end portion of the outer tube 4.
Next, the inner rod 3 is inserted into the outer tube 4 from the front of the outer tube 4.
[0017]
Subsequently, the bit adapter 6 is screwed and fixed to the front end of the outer tube 4, and the normal rotation male screw 15 of the inner rod 3 is fastened to the normal rotation screw 11 of the bit adapter 6.
As shown in FIG. 2, the extension rod 1 has a bit 8 attached to the front end of the bit adapter 6, and the rear end of the inner rod 3 is connected to a shank rod 19 of a rock drill 18 through a sleeve 20.
[0018]
The rock drill 18 is mounted on a conventional 3m feed guide shell 22 provided with a feed mechanism, and moves back and forth by the feed mechanism. A hydraulically operated centralizer 23 capable of clamping the outer rod 2 is provided at the front end portion of the guide shell 22.
Further, the rock drill 18 is provided with a striking mechanism and a rotation mechanism, and the striking and rotation are given to the bit 8 through the extension rod 1 to drill the rock.
[0019]
Here, in the rock drill 18, forward rotation is counterclockwise, so the forward rotation female screw 11 and the forward rotation male screw 15 are left-handed screws, and the reverse rotation female screw 12 and the reverse rotation male screw 17 are right-handed screws.
At the start of drilling, as shown in FIG. 6A, the extension rod 1 is contracted, and the normal rotation male screw 15 of the inner rod 3 is fastened to the normal rotation screw 11 of the outer rod 2.
[0020]
When performing drilling with a short hole length, the drilling operation may be performed as it is.
In the case of drilling a long hole of about 5 to 6 m, the drilling machine 18 is first drilled while forwardly rotating the drilling machine 18 in this state, and as shown in FIG. Is moved to the front end of the guide shell 22, the rear end portion of the outer rod 2 is clamped by the centralizer 23, and the rock drill 18 is moved backward and backward to rotate the normal rotation screw 15 of the inner rod 3 to the normal rotation screw of the outer rod 2. Remove from 11.
[0021]
Thereafter, when the rocker 18 is rotated forward while the rocker 18 is rotated forward, the inner rod 3 is extracted from the outer rod 4 and the extension rod 1 is extended, as shown in FIG. 6C. The extension rod 1 extends when the reverse rotation male screw 17 of the inner rod 3 is screwed into the reverse rotation female screw 12 at the rear portion of the outer rod 2 and the stopper 16 comes into contact with the corner of the front end of the reverse rotation female screw 12 of the outer rod 2. Ends. At this time, due to forward rotation (left rotation) of the rock drill 18, the reverse male screw 17 of the inner rod 3, which is a right-hand screw, receives a rotational force in the pull-out direction, but the stopper 16 prevents movement in the pull-out direction. Therefore, a strong screw fastening force works.
[0022]
When extension of the extension rod 1 is completed, the centralizer 23 is opened to release the clamp of the outer rod 2, and the drilling machine 18 is rotated forward again to make a hole.
As shown in FIG. 6 (d), when the drilling hole of a predetermined length is completed, the rock drill 18 is retracted to the position of FIG. 6 (c), the outer rod 2 is clamped, and the drill rocker 18 is moved forward in reverse. The reverse rotation male screw 17 of the inner rod 3 is detached from the reverse rotation female screw 12 of the outer rod 2.
[0023]
Thereafter, when the rock drill 18 is rotated forward on the guide shell 22 to the position shown in FIG. 6B, the inner rod 3 is inserted into the outer rod 2 and the extension rod 1 is contracted. When the forward rotation male screw 15 at the front portion of the inner rod 33 is fastened to the forward rotation screw 11 at the front portion of the outer rod 2, the reduction of the extension rod 1 is completed.
[0024]
When the extension rod 1 is completely contracted, the clamp of the outer rod 2 is released, and the drilling machine 18 is moved back to the rear end of the guide shell 22 as shown in FIG.
Since the extension rod 1 can be expanded and contracted, a long drilling hole of about 5 to 6 m can be formed without using a rod connecting device and using a short guide shell for 3 m feed. Drilling a rock bolt hole in a tunnel with a small cross section is easy.
[0025]
【The invention's effect】
As described above, according to the extension rod of the present invention, it is possible to drill a long hole without using a rod connecting device, without increasing the length of the guide shell, and the drilling device does not increase in size and costs. Can be reduced.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an extension rod showing an embodiment of the present invention.
FIG. 2 is a side view of a drilling device showing a state in which an extension rod is connected to a rock drill.
FIG. 3 is an enlarged view of a front portion of an outer rod.
FIG. 4 is an enlarged view of a rear portion of the outer rod.
FIG. 5 is an enlarged view of the front portion of the inner rod.
FIG. 6 is an explanatory diagram of an extension rod extension procedure.
[Explanation of symbols]
1 Extension rod 2 Outer rod 3 Inner rod 4 Outer tube 5 Adapter connecting screw 6 Bit adapter 7 Outer end 8 Bit 9 Bit mounting screw 10 Small hole 11 Forward rotating screw 12 Reverse rotating screw 13 Dust seal 14 O-ring 15 Forward rotating screw 16 Stopper 17 Reverse male screw 18 Rock drill 19 Shank rod 20 Sleeve 22 Guide shell 23 Centralizer

Claims (1)

It consists of an outer rod and an inner rod that is slidably inserted into the outer rod. An extension rod comprising a forward male screw, a stopper, and a reverse male screw.

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