JP2655688B2 - Rock Cutter Bit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention is used by connecting to a propulsion device (vacuum suction discharging method) for excavating a tunnel or the like, or burying water and sewage pipes and power cables. Related to cutter bits.

[Conventional technology]

A conventional cutter bit is disclosed in, for example, Japanese Patent Application Laid-Open No. 62-35093.
As described in the official gazette, simply excavating or rock drilling,
The crushed rock, earth and sand, etc. after the excavation are pressure-fed into the excavator from the outer peripheral surface by the thrust and the earth pressure of the excavator.

[Problems to be solved by the invention]

For this reason, in the conventional cutter bit having such a structure, frictional resistance such as crushed rock or earth and sand is added to the tip of the excavator, the tip of the excavator is severely worn, and the excavated soil collects on the bottom and functions as a cutting blade. However, there is a disadvantage that the propulsion speed decreases.

The problem to be solved in the present invention is to solve the above-mentioned drawbacks of the conventional excavator cutter bit, reduce the resistance of the excavator tip, and increase the original function of the excavator.

[Means for solving the problem]

A cutter bit according to the present invention is a cutter bit in which a plurality of main blade rows for rock drilling are arranged in a rotation axis direction, wherein a soil and sand transfer hole is formed in a blade bottom of the main blade row, and an inner hole is formed inside the cutter bit. A cavity is provided, and a pressure fluid supply hole provided at a front end, a soil discharging hole provided at a rear end, and the earth and sand transfer hole communicate with the inner cavity.

〔Example〕

 The attached drawings show an embodiment of the cutter bit of the present invention.

In FIG. 1 showing the outer surface of a cutter bit 1 according to the present invention, reference numeral 2 denotes a main blade provided on the outer periphery of a truncated conical bit main body 3. The main blade 2 is usually formed integrally with the bit main body 3 from a cemented carbide such as high tensile strength alloy steel, and FIG. 2 is a cutaway view of FIG. 1 as viewed in the direction of the line II-II. As described above, a plurality of first blade rows 21 radially arranged on the outer periphery of the bit main body, and a second blade row 22 displaced so as to form a star shape with the first blade row 21 are arranged on the rotation axis thereof. A plurality are alternately arranged in the direction of a. Reference numeral 4 denotes earth and sand transfer holes formed in the blade bottom portion between the main blades 2.

The arrangement and shape of the earth and sand transport hole 4 are such that the main blade at the tip plays the primary role of primary crushing of aged pipes and rocks, that is, the leading role, and the main blade in the last row plays the role of opening the propulsion machine track. Therefore, it is preferable to provide one piece between each blade 2 in each blade row 21 and 22 except for the front row and the last row.

Referring to FIG. 3 showing a longitudinal sectional structure of the cutter bit 1, a pressure fluid supply hole 5 provided at the tip thereof is provided inside.
And a cavity 7 communicating with the earth discharging hole 6 provided at the rear end, and the earth and sand transfer hole 3 communicates with the cavity 7.

FIG. 4 is a view showing a state in which the cutter bit 1 of the present invention is attached to the excavator main body A by a cross section at a lower portion. The cutter bit 1 is arranged around a rear shaft C of a tip casing B of the excavator main body A, As shown in FIG. 5, usually four are rotatably mounted via bearings D. The passage E of the compressed fluid in the main body A, usually compressed air, communicates with the pressurized fluid supply hole 5 of the cutter bit 1 via the rotary seal ring F, and the earth discharging hole 6 at the rear end thereof is connected to the excavator main body A. It is open to the discharge port G.

In this mounting state, the excavator body A is
Is propelled while rotating, as shown in FIG. 6, the plurality of main blades 2 of the cutter bit 1 excavate the rock,
The excavated crushed rock and earth and sand S automatically enter the lumen 7 of the cutter bit 1 through the suction hole 4, and the pressure fluid introduced from the pressure fluid supply hole 5 at the tip end of the cutter bit 1 causes the rear end of the crushed rock and the soil S to move. The discharge port G of the excavator body A from the discharge hole 6
Crushed rock and earth and sand are transported through the excavator.

As a result, the amount of crushed rock and sediment accumulated at the excavator tip is reduced, the resistance at the excavator tip is reduced, and the original function of the excavator is improved.

〔The invention's effect〕

With the cutter bit of the present invention having the above configuration,
The following effects can be obtained.

(1) Since the cutter bit removes the soil by itself without impairing its original function, various resistances on the excavator tip can be reduced, the propulsion function can be increased, and the propulsion distance can be extended.

(2) Since water can be drained from the earth and sand transfer hole of the cutter bit even on the ground having a high water content, the amount of water flowing backward from the propulsion hole can be reduced.

(3) It can be used not only for excavation but also for the regeneration of aging pipes in water and sewage systems.

[Brief description of the drawings]

The attached drawings show an embodiment of the cutter bit of the present invention. FIG. 1 shows the outer surface of a cutter bit 1 according to the present invention.
FIG. 2 is a cutaway view of FIG. 1 as viewed from the direction of the line II-II.
FIG. 3 shows a longitudinal section of FIG. FIG. 4 is a view showing a state where the cutter bit of the present invention is attached to an excavator body, and FIG. 5 is a front view thereof. FIG. 6 is a view showing the operating state of the cutter bit of the present invention. 1: cutter bit, 2: main blade 3: bit body, 4: earth and sand transfer hole 5: pressure fluid supply hole, 6: earth removal hole 7: lumen 21: first blade row, 22: second blade Column

Claims (1)

(57) [Claims] 1. A cutter bit in which a plurality of rock cutting main blade rows are arranged in the direction of the rotation axis, a soil and sand transport hole is formed in the blade bottom of the main blade row, and a bore is formed inside the cutter bit. And a pressure fluid supply hole provided at a front end, a soil discharging hole provided at a rear end, and the earth and sand transfer hole are respectively connected to the bore.