JPH0340957Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Field of Industrial Application] The present invention relates to a cutter head for excavating ground of medium or hardness such as permafrost. [Prior Art] As shown in Figs. 7 to 9, a conventional cutter head for excavation used for excavating medium-hard ground has a cutter body A with a cutter body A at the tip of a cutter body A, a cutter head B at the tip, a bit C at the outermost periphery, and a tangent line. The angle θ is 60~
At 80°, the angle α (rake angle) between the excavation surface of cutter bit c and the plane perpendicular to the excavated ground is 0°,
In addition, the relief angle β of the cutter bit c with respect to the excavated ground is 15°, and the mounting direction of the cutter bit c is oriented 15° inward with respect to the radius (radial rake γ). [Problems to be solved by the invention] However, with such conventional cutter heads, in the case of medium-hard ground such as permafrost, the rotational excavation resistance was too large, resulting in poor penetration and low excavation efficiency. [Means for solving the problems] The purpose of the present invention is to solve the above-mentioned problems, and to make it possible to penetrate well into medium-hard or higher ground and to achieve high excavation efficiency. A cutter bit is placed at the tip of the cutter body with a rake angle of 3 to 7 degrees and a relief angle of 5 to 5 degrees.
10 degrees and a radial rake of 20 to 30 degrees, and furthermore, the angle formed by the tangent between the fishtail and the outermost cutter bit is 40 to 50 degrees. [Effect] The angle θ between the tangent between the fish tail and the outermost bit becomes 40 to 50 degrees, making it sharp as a whole, and the rake angle α of the cutter bit is 3 to 7 degrees, and the relief angle β is 5 degrees.
~10° and the radial rake γ is 20 to 30°, which allows for good biting.Furthermore, since the foot tail is in the form of three peaks of medium and high heights, excavation resistance is reduced, allowing for highly efficient excavation. [Example] Hereinafter, an example of the present invention will be described based on the drawings. Figures 1 to 6 show an embodiment of the present invention,
A cutter body 1 has a cutter body 1 with a cutter body 1 having three mountain-shaped cutter tails 2 fixedly attached to the center of the tip. The fishtail 2 has a protruding central excavating blade 3, and carbide tips 6 are provided on the blades of excavators 4 and 5 provided at a required angle at the tip of the excavating blade 3, and side excavating blades 7 on both sides. An excavation surface 8 is also provided at a required angle, and a carbide tip 9 is provided on the blade portion of the excavation surface 8. An appropriate number of cutter bits 10 are arranged around the outer periphery of the cutter body 1 in the form of two spirals (in this embodiment, three threads each).
) is fixed, and the angle θ formed by the tangent between the outermost cutter bit 10 and the fish tail 2 is 40~
50 degrees, the rake angle α between the excavation surface of each cutter bit 10 and a plane perpendicular to the excavated ground is 3 to 7 degrees, the clearance angle β of each cutter bit 10 to the excavated ground is 5 to 10 degrees, and The cutter bit 10 is attached in such a way that the radial rake angle γ with respect to the radial direction is 20 to 30 degrees. The excavation cutter head of the present invention constructed as described above was compared with a conventional cutter head through a excavation test. <Test conditions> Base machine: IPD-85 (manufactured by Chugoku Kouki Co., Ltd.) Auger drive device: D-50H electric auger (manufactured by Sanwa Kizai) Weight: Main body 3900Kg Screw 200Kg 4100Kg Excavation torque: 1600Kg・m Rotation speed: 23r.pm Test ground: concrete (uniaxial compressive strength 300
~350Kg/cm ² ) Generator: EDG100 type (manufactured by Nichisha Co., Ltd.) The specifications and drilling results of each cutter head are shown in Table 1 below.

[Table] From the above results, the inventive model has a 50% improvement in drilling performance compared to the conventional model. The inventive model increases thrust by 60% compared to the conventional model.
%improves. It should be noted that the excavating cutter head of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention. [Effects of the invention] As described above, according to the cutter head for excavation of the invention, the shape of the auger head is sharpened and the tip of the cutter tail is shaped like three medium-high peaks.
It has various excellent effects such as improved penetration into medium-hard or higher ground, improved excavation efficiency by approximately 50%, and the ability to perform highly efficient excavation.

[Brief explanation of the drawing]

Fig. 1 is an explanatory view of one embodiment of the cutter head for excavation of the present invention, Fig. 2 is a view taken in the - direction arrow of Fig. 1, Fig. 3 is a detailed view of the fishtail in Fig. Figure 3 is a view in the - direction arrow, Figure 5 is a detailed view of the cutter bit in Figure 1,
Fig. 6 is a view taken in the - direction of Fig. 5, Fig. 7 is an explanatory diagram showing an example of a conventional cutter head, Fig. 8 is a view taken in the - direction of Fig. 7, and Fig. 9 is a view taken in the - direction of Fig. 7. It is a detailed view of the cutterbit. 1 is cutter body, 2 is fishtail,
3 is a digging blade, 6 and 9 are carbide tips, 7 is a side digging blade, 10 is a cutter bit, α is a rake angle, β is a clearance angle, and γ is a radial rake.

Claims (1)

[Scope of utility model registration request] A cutter bit is provided at the tip of the cutter body, and the cutter bit is placed on the cutter body at a rake angle of 3 to 7 degrees and a clearance angle of 5 to 10 degrees.
A cutter head for excavation, characterized in that the radial rake is fixed at an angle of 20 to 30 degrees, and the angle formed by the connection between the fishtail and the outermost cutter bit is 40 to 50 degrees.