JPH0554699U - Cutter bit - Google Patents

Abstract

(57) [Summary] [Purpose] Effectively perform excavation where boulders, gravel, etc. exist. [Structure] The bit body 1 is provided with a drilling tip 2 and a crushing tip 4, and the crushing tip 4 on the flank 3b side of the bit body 1 crushes boulders, gravel and the like. This crushing tip 4 has a V-shaped cutting edge 8 or a pointed cutting edge 9 in order to give a wedge effect to boulders, gravel and the like. The crushing chips 4 having the sharp tip 9 are cylindrical chips and are distributed in large numbers on the flank 3b side of the bit body 1. Further, the excavation tip 2 having the V-shaped cutting edge 10 is also applied, but the crushing tip 4 at this time has the V-shaped cutting edge 8 and is arranged alternately with respect to the rake face 3a and the flank 3b. It is like this.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a cutter bit, which is particularly suitable for shield excavation.

[0002]

[Prior Art]

 Conventionally, this kind of cutter bit has been provided with a flat blade having a width of 150 to 250 mm or a carbide tip having a loose roof shape. These cutter bits mainly act as scrapers for crushing small soft rocks and taking them into slits.

[0003]

[Problems to be solved by the device]

 However, the above-mentioned cutter bit has a small crushing effect on the excavation of considerably large boulders and gravel, and the excavated material cannot be easily taken in. In addition, there is a problem that the chips may be chipped or fall off due to overload due to the propulsive force and rotational force of the machine.

[0004]

[Means for Solving the Problems]

 The present invention has been made in view of the above-mentioned point, and a crushing chip for boulders, gravel, etc. is provided on the flank side of the cutting chip provided at one end of the bit body. In this case, the crushing chips are arranged at positions separated from each other in the direction along the cutting edge, and the V-shaped cutting edge projects in the direction orthogonal to the cutting edge. In addition, this crushing tip also includes one that is distributed on the flank of the bit body, and the cutting edge at this time is a hemispherical or conical shape.

Further, the drilling tips and the crushing tips are alternately arranged at one end of the bit body, and the V-shaped cutting edges of the drilling tips are substantially orthogonal on the rake face side with reference to the cutting edge direction. As the crushing tip, a crushing tip having a V-shaped cutting edge which is substantially orthogonal to the flank side is also applied.

[0006]

[Action]

 Since the present invention is provided with a drilling tip and a crushing tip for boulders, gravel, etc., a V-shape in which crushed chips and boulders and gravel entwined on the flank of the bit body It is crushed by the wedge effect of the hemispherical and conical cutting edges.

[0007]

【Example】

 An embodiment of the cutter bit of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a block-shaped bit main body, and one end of the bit main body 1 is provided with a plurality of divided drilling tips 2, and the flank 3b side thereof is provided with Crushing chips 4 such as boulders and gravel are provided. In this case, the digging tip 2 forms the cutting edge 7 by the intersection of the rake face 5 and the flank face 6. In the direction along the cutting edge 7, the crushing tips 4 are separated from each other. In position. A V-shaped cutting edge 8 is formed in a direction orthogonal to the cutting edge 7. This is because the V-shaped cutting edge 8 facilitates the crushing of boulders, gravel, etc. due to the wedge effect.

Further, as shown in FIG. 2, the crushed chips 4 can also be distributed in a large number of cylindrical chips. In the crushing tip 4 in this case, the tip edge 9 has a substantially semicircular or conical shape.

Further, in FIG. 3, the drilling tips 2 and the crushing tips 4 are arranged alternately from the side of the rake face 3a and the flank 3b of the bit body 1. The excavating tip 2 and the crushing tip 4 both have V-shaped cutting edges 8 and 10 which are alternately arranged in an orthogonal direction so as to eliminate the entanglement of boulders, gravel and the like.

[0011]

[Effect of the device]

 The cutter bit of the present invention thus constructed has the advantage that it can perform an effective excavating action because it can crush boulders, gravel, etc. by the V-shaped cutting edge 8 and the tip cutting edge 9 of the crushing tip 4.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a cutter bit of the present invention.

FIG. 2 is a perspective view showing another embodiment.

FIG. 3 is a perspective view showing another embodiment.

[Explanation of symbols]

 1 bit main body 2 drilling tip 3a rake face 3b flank face 4 crushing tip 5 rake face 6 flank face 7 cutting edge 8 V-shaped cutting edge 9 pointed cutting edge 10 V-shaped cutting edge

Claims (3)

[Scope of utility model registration request] 1. A drilling tip 2 is provided at one end of a bit body 1.
In the cutter bit that is provided with, a crushing tip 4 for boulders, gravel, etc. is provided on the flank 3b side of the bit body 1, and the crushing tip 4 is provided on the cutting edge 7 of the excavating tip 2. A cutter bit characterized in that they are spaced apart from each other in the along direction, and that a V-shaped cutting edge 8 projects in a direction orthogonal to the cutting edge 7. 2. The crushing chips 4 according to claim 1 are distributed on the flank 3b side of the bit body 1, and the hemispherical or conical pointed cutting edge 9 thereof is projected. The cutter bit according to Item 1. 3. The excavating chips 2 and the crushing chips 4 according to claim 1 are arranged alternately, and the excavating chips 2 have a V-shaped cutting edge 10 formed on the rake face side thereof, and the crushing chips 4 are The cutter bit according to claim 1, wherein a V-shaped cutting edge 8 is formed on the flank side.