JPH0458557B2 - - Google Patents

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]

In general, drilling operations in hard rock include:
A percussion rotary rock drill is mounted on the guide shell,
A drilling device is used in which a rod with a bit fixed to the tip is connected to the rock drill, and the rock drill is moved back and forth by a feeding mechanism.

[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 rock drill becomes large and heavy. Therefore, the guide shell on which the rock drill is mounted and the boom, cart, etc. 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 rotation mechanism of the rock drill, the rotational resistance of the rod increases as the drilling length increases.
Large rotational energy is required. Moreover, curved rods could not be used, and only straight holes could be made with straight rods.

This invention solves this problem in drilling devices.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a drilling device that has a simple structure and can be made smaller and lighter in weight. 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 punching 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 is rotated by a jet of fluid for dust discharge.

[Effect]

When drilling with this drilling device, 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 and 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〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an elevational view of a drilling device which is an embodiment of the present invention, in which a striking device 3 is mounted on a guide shell 1 via a carriage 2, and a hollow A rod 4 is connected to the rod 4, and a bit 5 is attached to the tip of the rod 4.

The guide shell 1 is curved upwardly in a convex manner with a constant curvature, and a rod support device 6 and a foot pad 7 are fixedly installed at the tip. The guide shell 1 also includes a roller 8, a chain 9 which is wound around the roller 8 and whose both ends are connected to the front and rear ends of the carriage 2, and which drives the chain 9 to move the carriage 2 back and forth. It is equipped with a feed motor 10.

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 strikes a shank rod 14 inserted in the front part. Reference numeral 15 denotes an inlet for a fluid for discharging powder that is fitted into 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 sink rod, and 18 is a leak-proof seal. Shun rod 14 of this striking device 3
A hollow rod 4 is connected to the sleeve 19 by a sleeve 19. This rod 4, like the guide shell 1, is curved upward in a convex manner. At the tip of rod 4,
As shown in FIG. 4, an enlarged diameter portion 20 is provided, and a bit 5 is screwed onto a rotary cap 21 that is fitted thereafter.

Bit 5 is as shown in Figures 3 and 4.
A chip 22 for crushing rocks is fixed on the front end surface,
In addition, a nozzle 23 for spouting a fluid for discharging the powder is open. 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 shunt rod through the hollow hole 24 of the rod 4. 25 is a rotary cap seal.

This drilling device is supported by a boom (not shown) installed on a truck, and during drilling work, the pad 6 of the guide shell 1 is pressed against the rock and fixed, and the feed motor 10 feeds the impact device 3. .
The striking device 3 strikes the can 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 is supplied to the inlet 16,
The fluid is ejected from the nozzle 23 through the fluid passage 17 and the hollow hole 24, and the bit 5 is rotated by the reaction force of this ejection.

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

Here, in order to give sufficient rotational force to the bit 5, it is desirable that the fluid ejected from the nozzle 23 be at a higher pressure than in the case of a conventional percussion rotary rock drill, especially at a high pressure of about 1000 Kgf/ ^cm2 . In this way, not only rotation but also a perforation effect as a fluid jet can be obtained.

In this drilling device, since the rod 4 is not rotated, a curved hole can be drilled by using the curved rod 4 as in this embodiment. 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 you drill a hole,
The amount of over-excavation can be reduced compared to conventional straight-line drilling.

Although this embodiment shows the case where a curved 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 constructed as described above, it does not require a rod rotation mechanism and has a simple structure, 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. Can be done. 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 cross-sectional view showing the schematic structure of a striking device, Fig. 3 is a front view of the bit, and Fig. 4 is the same as Fig. 3. It is a rule line sectional view. 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 an introduction part for the fluid for discharging dust, and 23 is a nozzle. .

Claims (1)

[Claims] 1. A punching 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.