JPH0437991Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a disc cutter used for excavating rock boulder layers, etc.

BACKGROUND TECHNOLOGY Conventionally, as shown in FIGS. 5 and 6, a disk cutter (for example, a roller bit) for excavating rock, etc. has a circular disk body 1 with a mountain-shaped outer periphery, and a circular disk cutter (e.g., a roller bit) with holes cut at regular intervals. A plurality of carbide chips 2 were embedded in the holder. (For example, see Utility Model Application Publication No. 56-168584.) Problems to be Solved by the Invention By the way, the above-mentioned disc cutter has been used in tunnel boring machines for a long time. is rock, and during excavation, only the outer tip of the disc cutter penetrates the rock, as shown in Figure 7, so it is possible to extend the life of the disk cutter by reinforcing the outer tip with carbide chips. Ta. However, as shown in Figure 8, in a gravel layer with boulders intervening (in this case, for example, a shield bending machine is used), the excavated soil contacts not only the tip of the outer periphery but also the surrounding area. As shown by the imaginary line in FIG. 6, there were problems in that the mountain-shaped inclined surface 3 was worn out, and crushed pieces collided with the inclined surface and caused damage.

Therefore, an object of the present invention is to provide a disk cutter that solves the above problems.

Means for Solving the Problems In order to solve the above problems, the disc cutter of the present invention has a disc main body having a chevron-shaped outer periphery. The angle of intersection between the inner slopes is smaller than the angle of intersection between the outer slopes, and the top of the outer slope and the inner slope are The hard chips are embedded at predetermined intervals so as not to protrude from the disk body, and the carbide chips placed on the outer sloped surface and the carbide chips placed on the inner slope are alternately arranged along the circumferential direction. It was placed in

Effect When a gravel layer is excavated using the disc cutter mentioned above, the gravel comes into contact with the slope, but the slope angle on the inner slope is steeper than on the outer slope.
During excavation, the contact force with the sand and gravel is significantly reduced, and even if the crushed pieces are scattered, they hardly ever hit the slope, thus making it possible to prevent wear and damage to the slope. Further, since the carbide chips embedded in the top of the outer circumferential inclined surface and the inner circumferential inclined surface are prevented from protruding from the disk body, no impact force is generated due to collision with gravel, for example. Furthermore, since the carbide chips embedded in the outer peripheral inclined surface and the inner peripheral inclined surface are arranged alternately in the circumferential direction, the carbide chips can be buried deeply, and therefore the adjacent carbide chips can be buried deep. Even if the disc body between the discs wears out, the carbide chips will not fall off.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

That is, the disk cutter 11 according to the present invention
is a disk body 1 whose outer periphery is formed into a mountain shape.
The two mountain-shaped inclined surfaces of No. 2 are formed in two steps, an outer inclined surface 13 and an inner inclined surface 14, and the intersection angle θ ₁ between the inner inclined surfaces 14 is set as the outer inclined surface 1.
3, and the top of the outer sloping surface ₁₃ and the inner sloping surface 1.
4, carbide chips 15 and 16 are embedded at predetermined intervals so as not to protrude from the disk body 12, and the carbide chips 15 and 16 are placed on the outer sloped surface 13 and the inner sloped surface 14, respectively. Carbide chips 16 are arranged alternately (staggered) along the circumferential direction.

Note that the intersection angle θ ₂ between the outer peripheral side inclined surfaces 13 is as follows:
For example, the angle is appropriately selected in the range of 90° to 105° depending on the hardness of the rock.

According to the disk cutter 11, the angle of inclination of the inner slope 14 is steeper than that of the outer slope 13, so during excavation, the contact force with gravel is significantly reduced, and crushed pieces are removed. Even if it scatters, it almost never hits the inclined surfaces 13, 14, so that wear and damage to the inclined surfaces 13, 14 can be prevented. In addition, each carbide chip 15,1
6 is provided so as not to protrude from the disk body 12, so no impact force is generated due to collision with gravel. Furthermore, since the carbide chips 15 and 16 embedded in the outer peripheral side inclined surface 13 and the inner inclined surface 14 are arranged alternately in the circumferential direction, that is, in a staggered manner, each of the carbide chips 15 and 16 is embedded in the disk body. 12, and therefore adjacent carbide chips can be embedded deeply into each other at 15, 15:16,
Even if the portion of the disk body 12 between the chips 16 is worn out, the carbide chips 15 and 16 will not easily fall off.

Incidentally, FIG. 3 shows a case in which the structure of the above embodiment is applied to a roller bit, and FIG. 4 shows a case in which it is applied to a gauge cutter.

Effects of the invention According to the configuration of the invention described above, since the slope angle of the inner peripheral side slope is steeper than that of the outer peripheral side slope, during excavation, the contact force with sand and gravel is significantly reduced, and fragments are broken. Even if the particles are scattered, they almost never hit the sloped surface, and therefore wear and damage to the sloped surface can be prevented. In addition, since the entire outer periphery of the disk body has an acute angle, even if the outer periphery tip wears out, there is little resistance to penetration into rock, etc.
Therefore, the sharpness does not deteriorate. Further, since the carbide chips embedded in the top of the outer circumferential inclined surface and the inner circumferential inclined surface are prevented from protruding from the disk body, no impact force is generated due to collision with gravel, for example. Furthermore, since the carbide chips embedded in the outer circumferential inclined surface and the inner circumferential inclined surface are arranged alternately in the circumferential direction, it is possible to embed the carbide chips deeply, and therefore the adjacent carbide chips Even if the disc body between the discs wears out, the carbide chips will not fall off.

[Brief explanation of the drawing]

Figure 1 is a side view of essential parts of an embodiment of the present invention, Figure 2
The figure is a view taken along the - arrow in FIG. 1, FIGS. 3 and 4 are plan views showing an example of application of the configuration of one embodiment, and FIGS. 5 to 8 are views for explaining a conventional example. Fig. 5 is a side view of the main part, Fig. 6 is a - arrow direction view of Fig. 5,
FIGS. 7 and 8 are diagrams showing usage examples. DESCRIPTION OF SYMBOLS 11... Disk cutter, 12... Disc main body, 13... Outer circumferential side inclined surface, 14... Inner circumferential side inclined surface, 15, 16... Carbide tip.

Claims (1)

[Scope of utility model registration request] The two mountain-shaped inclined surfaces of the disk body, which has a mountain-shaped outer peripheral portion, are formed into two steps, an outer peripheral inclined surface and an inner peripheral inclined surface, and the intersection angle between the inner peripheral inclined surfaces is set as the outer peripheral side. The angle is smaller than the intersection angle between the side inclined surfaces, and carbide chips are embedded at predetermined intervals on the top of the outer inclined surface and the inner inclined surface so as not to protrude from the disk body, and the outer inclined surface 1. A disk cutter characterized in that carbide chips arranged on the inner peripheral side and carbide chips arranged on the inner peripheral side are alternately arranged along the circumferential direction.