JPS61196097A - Drilling apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drilling device used for drilling hard rock.

[Conventional technology]

Generally, for drilling work in hard rock, a rotary impact rock drill is mounted on a guide shell, a rod with a bit fixed to the tip is connected to the rock drill, and a feeding mechanism moves the rock drill back and forth. A moving type of punching device is used.

[Problem that the invention seeks to solve]

However, in such a drilling device, since the rock drill is provided with a striking mechanism and a rotating mechanism, the structure is complicated, and the drill rock becomes large and heavy. Therefore, the guide shell and L on which the rock drill is mounted, as well as the boom and cart that support it, are also large in size, making them unsuitable for work in narrow spaces.

In addition, since the entire rod is rotated by the rotary mechanism of the Drilling Iwatsuki, the length of the hole is long (as the length of the hole increases, the rotational resistance of the rod increases and a large amount of rotational energy is required. Moreover, a bent rod cannot be used. Only a straight hole could be made with a straight rod.

This invention solves this problem in drilling devices.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a drilling device that has a simple structure and can be made smaller and lighter.It is also an object of this invention to eliminate rotational resistance of the rod and save rotational energy. A further object of the present invention is to provide a drilling device that is capable of drilling curved holes.

[Means for solving problems]

In the drilling device of the present invention, a hollow rod is connected to a striking device movably mounted on a guide shell, and a bit is attached to the tip of the rod, which rotates by jetting out fluid for dust discharge.

[Effect]

When this drilling device performs drilling work, the striking device strikes the rod, and the impact is transmitted to the bit. At the same time, a powder discharge fluid is supplied from the hollow rod to the bit, is ejected from the nozzle, and the bit is rotated by the reaction force of this ejection.

The rock is perforated by the impact energy and rotation applied to this bit.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is an elevational view of a punching device which is an embodiment of the present invention. A rod 4 is connected thereto, and a bit 5 is attached to the tip of this rod 4.

The guide shell 1 is curved upward with a constant curvature in a convex shape, and a rod support device 6 and a footpuff door are fixedly installed at the tip. The guide shell 1 also includes a roller 8, a chain 9 wound around the roller 8 and connected at both ends to the front and rear ends of the carriage 2, and a chain 9 that is driven to move the carriage 2 back and forth. The feed motor 10 is also provided.

As shown in FIG. 2, the striking device 3 is a known striking mechanism in which a piston 12 is slidably fitted into a cylinder 11, and a switching valve 13 switches the supply of working fluid to the front and rear chambers to reciprocate the piston 12 back and forth. The piston 12 gives a blow to the shank rod 14 inserted in the front part. Reference numeral 15 denotes an inlet for a fluid for discharging powder that is fitted onto the shank rod 14, and an inlet 16 is connected via a pipe to a pump (not shown) for supplying fluid for discharging powder. 17 is a fluid passage of the shank rod, and 18 is a leak-proof seal. A hollow rod 4 is connected to a shank rod 14 of this striking device 3 through a sleeve 19.

This rod 4, like the guide shell 1, is curved upward in a convex shape. As shown in FIG. 4, the tip of the rod 4 is provided with an enlarged diameter portion 20, and the bit 5 is screwed onto a rotary camp 21 fitted thereon.

As shown in FIGS. 3 and 4, the bit 5 has a tip 22 fixed to its front end face for crushing rocks, and has an open nozzle 23 for spouting fluid for discharging powder. This nozzle 23 is inclined at a predetermined angle in order to impart rotation to the bit 5, and communicates with the fluid passage 17 of the shank rod through the hollow hole 24 of the rod 4.

25 is a rotary cap seal.

This drilling device is equipped with a boom (not shown) installed on a truck.
During drilling work, the foot pad 6 of the guide shell 1 is pressed against the rock and fixed, and the feed motor 1
At 0, feed is given to the striking device 3. The striking device 3 strikes the shank rod 14 by reciprocating the piston 12, and this striking impact is transmitted to the bit 5 via the rod 4.

At this time, the fluid for discharging powder particles flows from the inlet 16 to the fluid passage 17. It is ejected from the nozzle 23 through the hollow hole 24, and rotation is given to the bit 5 by the reaction force of this ejection.

Therefore, by the impact and rotation of this bit 5, the rock 26
is crushed and perforated. The powder generated by crushing the rock 26 is discharged by a powder discharge fluid ejected from the nozzle 23.

Here, in order to give sufficient rotational force to the bit 5, the fluid ejected from the nozzle 23 is desirably at a higher pressure than in the case of a conventional percussion rotary rock drill, especially 10010
If the pressure is as high as 0O/c+J, not only rotation but also a perforation effect as a fluid jet can be obtained.

In this drilling device, since no rotation is applied to the rod 4,
As in this embodiment, a curved hole can be drilled by using a rod 4 that is flattened. The direction of the curvature may be convex downward, contrary to this embodiment, or it may be curved to the right or left, so when excavating a curved tunnel, for example, this drilling device can be used. If the hole is drilled in a straight line, the amount of over-excavation can be reduced compared to conventional straight hole drilling.

Although this embodiment shows the case where a bent rod is used, it goes without saying that the drilling device of the present invention can perform straight drilling using a straight rod.

〔Effect of the invention〕

Since the drilling device of the present invention is configured as described above, it does not require a rotating mechanism for the rod, so the structure is simple, making it possible to reduce the size and weight.In addition, there is no rotational resistance of the rod, and rotational energy can be saved. I can do it. Furthermore, by selecting the curvature of the rod, it is possible to make both straight and curved holes.

[Brief explanation of drawings]

FIG. 1 is an elevational view of a punching device which is an embodiment of the present invention;
FIG. 2 is a sectional view showing a schematic configuration of the striking device, FIG. 3 is a front view of the bit, and FIG. 4 is a sectional view along the rule line of FIG. 3. In the figure, 1 is a guide shell, 3 is a striking mechanism, 4 is a rod,
5 is a bit, 11 is a cylinder, 12 is a piston, 14 is a shank rod, 15 is a fluid introduction part for dust discharge, 2
3 is a nozzle.

Claims (1)

[Claims] A drilling device characterized in that a hollow rod is connected to a striking device movably mounted on a guide shell, and a bit is attached to the tip of the rod to be rotated by jetting out fluid for dust discharge.