JP2583396B2 - Rod for drilling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod for a drilling machine to which a guide pipe is mounted.

[0002]

2. Description of the Related Art In a drilling device such as a crawler drill or a tunnel jumbo, a drilling machine is fixed on a carriage mounted on a guide shell so as to be able to move forward and backward, and a shank rod is inserted into the drilling machine. A rod of a predetermined length is connected to the shank rod via a sleeve, and a bit is attached to the end of the rod. Drilling and rotation are transmitted from the drilling machine to the bit to drill the rock. The drilling hole diameter is determined by the bit diameter, and the bit diameter is generally larger than the rod diameter.

[0003] Rocks to be drilled are not uniform in physical properties, and drilling is liable to bend. If the difference between the bit diameter and the rod diameter is large, the gap between the hole wall and the outer periphery of the rod becomes large, so that the bending is particularly large in many cases. Therefore, in a rod having a large difference between the bit diameter and the rod diameter, a rod having a guide pipe attached to the rod is used in order to reduce the difference between the bit diameter and the outer diameter. Since this guide pipe must advance with the rod as the drill advances, when a long guide pipe is used, the trailing end abuts the sleeve, and when the carriage is fed, the drilling machine The thrust is transmitted from the shaft through the shank rod and the sleeve.

However, since a long guide pipe is heavy and difficult to handle, and requires a great deal of labor for the operator, it is desirable to use a guide pipe that is as short as possible within a range in which the required effect of preventing bending can be obtained. When such a relatively short guide pipe is used, a large diameter portion is provided at a predetermined position of the rod, and the large diameter portion applies a thrust to the rear end of the guide pipe and holds the guide pipe forward.

[0005]

However, since the rod provided with the large diameter portion is generally manufactured by forging after forging, or by being cut out from a thick round bar material, it is manufactured in an integral shape. It takes time and costs. Also, at the time of drilling, not only thrust but also impact due to the impact of the drilling machine is transmitted from the large diameter portion of the rod to the rear end of the guide pipe, causing damage to the large diameter portion and the end of the guide pipe, In addition, the guide pipe collides with the rear end of the bit and wears and damages the mounting screw of the bit.

SUMMARY OF THE INVENTION The present invention solves such a problem in a rod for a drilling machine, and the shock transmitted from the rod to the guide pipe is buffered to greatly reduce the damage. It is an object of the present invention to provide a rod for a drilling machine capable of preventing wear and damage of a screw and a mounting screw of a bit and improving durability.

[0007]

According to the present invention, a bit for a drilling machine, in which a bit is attached to the tip and a guide pipe is mounted behind the bit, has an elastic body on the inside and a metal ring on the outside. The above-mentioned problem is solved by fitting the collar at a position where thrust is applied to the guide pipe to hold the collar forward.

[0008]

When feed is given to the drilling machine as the drilling advances, thrust is transmitted to the guide pipe from the rod via the collar, and the guide pipe advances with the rod. At the time of drilling, not only the thrust but also the impact of the drilling machine is transmitted from the collar to the rear end of the guide pipe.At this time, the impact transmitted from the rod to the guide pipe is buffered by the elastic body of the collar and greatly reduced. As a result, breakage of the guide pipe and wear and tear of the bit mounting screws are prevented, and durability is improved.

[0009]

FIG. 1 is a side view of a drilling machine having a rod according to an embodiment of the present invention, FIG. 2 is an enlarged longitudinal sectional view showing a part of a rod for the drilling machine, and FIG. FIG. 3 is an explanatory diagram of a color configuration. A drilling machine 3 is fixed on a carriage 2 mounted on a guide shell 1 so as to be able to move forward and backward. A shank rod 4 is inserted into the drilling machine 3, a rod 6 having a predetermined length is connected to the shank rod 4 via a sleeve 5, and a bit 7 is screwed to a tip of the rod 6.
A guide pipe 8 having a slightly smaller outer diameter than the bit diameter is mounted on the rod 6 at the rear of the bit 7.
Is fitted. The collar 10 has an elastic body 11 on the inside,
The outer side is formed of a metal ring 12, and the elastic body 11 and the metal ring 12 are firmly bonded or crimped so as not to be separated. The collar 10 is firmly adhered or crimped to the rod 6 so as not to shift or come off during use.

[0010] The tip of the guide pipe 8 is held by a centralizer 9, and the drilling machine 3 is fed by the carriage 2, and the shank rod 4, the sleeve 5,
The striking and rotation are transmitted to the bit 7 via the rod 6 to pierce the rock. At this time, thrust is transmitted from the rod 6 to the guide pipe 8 via the collar 10, so that the guide pipe 8 advances with the rod 6. At the time of drilling, not only the thrust but also the impact due to the impact of the drilling machine 3 is transmitted from the collar 10 to the rear end of the guide pipe 8. At this time, the impact transmitted from the rod 6 to the guide pipe 8 is caused by the elasticity of the collar 10. Since it is buffered and greatly reduced by the body 11, breakage of the guide pipe 8 and abrasion damage of the mounting screw 13 of the bit 7 are prevented, and durability is improved.

FIG. 4 is an explanatory view of another embodiment of the collar. In this embodiment, the front end of the metal ring 12 is extended to protect the elastic body 11 from directly abutting on the guide pipe 8. I have. FIG. 5 is a side view of a drilling machine having a plurality of rods according to another embodiment, FIG. 6 is a plan view of a drilling machine having a plurality of rods, and FIG. 7 is a horizontal sectional view of a guide pipe.

In this embodiment, four rods 6 to which the bits 7 are attached are arranged in parallel with the adjacent bits 7 being slightly displaced back and forth, and four shank rods inserted into the drilling machine 3. 4 and a sleeve 5. At the front end of the rod 6 immediately after the bit 7, a guide pipe 8 having a slightly smaller outer diameter than the bit diameter is mounted, and a collar 1 is provided at a position where a thrust is applied to the guide pipe 8 and the guide pipe 8 is held forward.
0 is fitted. As in the embodiment of FIG. 3, the collar 10 has an elastic body 11 on the inside and a metal ring 12 on the outside. The four guide pipes 8 form a rod guide 14 continuously in parallel, maintain a constant distance between the four rods 6, and this rod guide 14 is held by the centralizer 9.

Also in this embodiment, the drilling machine 3 is fed by the carriage 2, and transmits impact and rotation to the bit 7 via the shank rod 4, the sleeve 5, and the rod 6 to drill the rock. At this time, thrust is transmitted from the rod 6 to the guide pipe 8 via the collar 10, so that the guide pipe 8 advances with the rod 6. At the time of drilling, not only the thrust but also the impact due to the impact of the drilling machine 3 is transmitted from the collar 10 to the rear end of the guide pipe 8,
At this time, the impact transmitted from the rod 6 to the guide pipe 8 is buffered by the elastic body 11 of the collar 10 and is greatly reduced. The performance is improved.

[0014]

As described above, according to the rod for a drilling machine of the present invention, the shock transmitted from the rod to the guide pipe is buffered and greatly reduced, and the guide pipe is damaged and the bit is attached. The wear and damage of the screw can be prevented and the durability can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a drilling machine having a rod according to an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view showing a part of a rod for a drilling machine of the embodiment of FIG. 1;

FIG. 3 is an explanatory diagram of a color configuration.

FIG. 4 is an explanatory diagram of a collar according to another embodiment.

FIG. 5 is a side view of a drilling machine having a plurality of rods according to another embodiment.

FIG. 6 is a plan view of a drilling machine having a plurality of rods.

FIG. 7 is a horizontal sectional view of a guide pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide shell 2 Carriage 3 Drilling machine 4 Shank rod 5 Sleeve 6 Rod 7 Bit 8 Guide pipe 9 Centralizer 10 Color 11 Elastic body 12 Metal ring

Claims (1)

(57) [Claims] 1. A rod for a drilling machine in which a bit is attached to a tip and a guide pipe is mounted behind the bit, the collar having an elastic body on the inside and a metal ring on the outside. A rod for a drilling machine which is fitted at a position where it gives thrust to the front and holds it forward.