JPH0430190U

JPH0430190U -

Info

Publication number: JPH0430190U
Application number: JP7066590U
Authority: JP
Priority date: 1990-07-04
Filing date: 1990-07-04
Publication date: 1992-03-11
Anticipated expiration: 2005-07-04
Also published as: JP2510379Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例である泥水式シール
ド用フイツシユテールビツトの正面図、第２図は
その一部切り欠いた側面図、第３図は第２図のＡ
−Ａ断面図、第４図は同Ｂ−Ｂ断面図、第５図は
フイツシユテールビツトを備えた泥水式シールド
掘進機の側断面図、第６図は従来の粘性土・砂質
土用フイツシユテールビツトの正面図、第７図は
その一部切り欠いた側面図、第８図は第７図のＣ
−Ｃ断面図、第９図は従来の砂礫用フイツシユテ
ールビツトの正面図、第１０図はその一部切り欠
いた側面図、第１１図は第１０図のＤ−Ｄ断面図
、第１２図は同Ｅ−Ｅ断面図、第１３図は従来の
粘性土・砂質土用フイツシユテールビツトの摩耗
形態を示す正面図、第１４図はその側面図、第１
５図は第１４図のＦ−Ｆ断面図、第１６図は従来
の砂礫用フイツシユテールビツトの摩耗形態を示
す正面図、第１７図はその側面図、第１８図は第
１７図のＧ−Ｇ断面図である。１……フイツシユテールビツト、１ａ……母材
、１ｂ……角の部分、２……他の周縁部に植え込
まれた超硬チツプ、３……角の部分１ｂに植え込
まれた超硬チツプ、４……硬質肉盛、６……カツ
タヘツド、ｔ_１……超硬チツプ２の厚さ、ｈ_１…
…超硬チツプ２の高さ、ｔ_２……超硬チツプ３の
厚さ、ｈ_２……超硬チツプ３の高さ、ｗ……超硬
チツプ３の幅（植え込み範囲）。 Fig. 1 is a front view of a fishtail bit for a muddy water shield which is an embodiment of the present invention, Fig. 2 is a partially cutaway side view thereof, and Fig. 3 is A of Fig. 2.
-A sectional view, Fig. 4 is a BB-B sectional view, Fig. 5 is a side sectional view of a muddy shield excavator equipped with a fishing tail bit, and Fig. 6 is a conventional one for clayey soil and sandy soil. A front view of the fishtail bit, Figure 7 is a partially cutaway side view, and Figure 8 is C of Figure 7.
-C sectional view, FIG. 9 is a front view of a conventional fishing tail bit for sand and gravel, FIG. 10 is a partially cutaway side view, FIG. The figure is a sectional view taken along the line E-E, Figure 13 is a front view showing the wear pattern of a conventional fishing tail bit for clayey soil and sandy soil, Figure 14 is a side view of the same, and Figure 14 is a side view of the same.
Fig. 5 is a sectional view taken along line F-F in Fig. 14, Fig. 16 is a front view showing the form of wear of a conventional fishing tail bit for sand and gravel, Fig. 17 is a side view thereof, and Fig. 18 is a cross-sectional view taken along line G in Fig. 17. -G sectional view. DESCRIPTION OF SYMBOLS 1...Fish tail bit, 1a...Base material, 1b...Corner part, 2...Carbide chip implanted in other peripheral area, 3...Carbide chip implanted in corner part 1b Hard chip, 4...Hard overlay, 6...Cut head, _t1 ...Thickness of carbide chip 2, _h1 ...
...Height of the carbide chip 2, t2 _... Thickness of the carbide chip 3, h2 _... Height of the carbide chip 3, w...Width of the carbide chip 3 (implantation range).

Claims

[Scope of utility model registration request]

In the fishtail bit attached to the center of the cutter head of the shield excavator, there are
A fishtail bit for a shield excavator, characterized in that a carbide chip is implanted which is thicker and taller than other carbide chips implanted in the peripheral part.