JP3759286B2 - Fish excavator fishtail bit - Google Patents

Fish excavator fishtail bit Download PDF

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Publication number
JP3759286B2
JP3759286B2 JP13466497A JP13466497A JP3759286B2 JP 3759286 B2 JP3759286 B2 JP 3759286B2 JP 13466497 A JP13466497 A JP 13466497A JP 13466497 A JP13466497 A JP 13466497A JP 3759286 B2 JP3759286 B2 JP 3759286B2
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Japan
Prior art keywords
base material
carbide
carbide tip
front surface
side surfaces
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Expired - Fee Related
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JP13466497A
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Japanese (ja)
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JPH10325292A (en
Inventor
政己 橋本
章治 新宅
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Komatsu Ltd
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Komatsu Ltd
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  • Earth Drilling (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、シールド掘削機のカッタヘッド中央に取付けられたフィッシュテールビットに関する。
【０００２】
【従来の技術】
シールド掘削機のフィッシュテールビットとしては、例えば実用新案登録第２５１０３７９号公報に示すものが知られている。このフィッシュテールビットは、相互に平行となった両端面と、この両端面と連続しほぼＶ字状となった前面を有する板状の母材と、この母材の両端面と前面における厚さ方向中央部に連続して植え込んだ超硬チップで形成してある。
【０００３】
【発明が解決しようとする課題】
前述のフィッシュテールビットであると、図４に示すように超硬チップ１により掘削された掘削土砂２が母材３の表面３ａに沿ってカッタヘッドに向けて移動するので、その掘削土砂の流れによって超硬チップ１の厚さ寸法より突出した母材３の表面３ａが削られ、母材３の摩耗が激しい。
【０００４】
母材３が摩耗すると、超硬チップ１の支持代が減少して超硬チップ１が脱落してしまう。
【０００５】
そこで、本発明は前述の課題を解決できるようにしたシールド掘削機のフィッシュテールビットを提供することを目的とする。
【０００６】
【課題を解決するための手段及び作用・効果】
第１の発明は、シールド掘削機のカッタヘッド１５中央に取付けられ、母材１０と超硬チップ１１で形成されたフィッシュテールビットにおいて、
前記母材１０を、前記カッタヘッド１５の回転中心線１５ａとほぼ平行な長さ方向両端の両端面と、幅方向一方側で、前記回転中心線１５ａに斜交する前面と、前記カッタヘッド１５に取付けられる幅方向他方側の後面と、厚さ方向両側の両側面を有する所定の長さと幅と厚さの板状体とし、
前記超硬チップ１１を、前記母材１０の前面と両側面が交わることによって形成されるコーナー部にそれぞれ設けた前部超硬チップ１１−１と、前記母材１０の両端面と両側面が交わることによって形成されるコーナー部における前面寄りにそれぞれ設けた端部超硬チップ１１−２で形成したことを特徴とするシールド掘削機のフィッシュテールビットである。
【０００７】
第１の発明によれば、超硬チップ１１で掘削された掘削土砂は超硬チップ１１の側面１１ａに沿ってカッタヘッド１５に向けて移動するので、その掘削土砂によって母材１０の側面が削られることがない。
【０００８】
これによって、母材１０が摩耗して超硬チップ１１が脱落することがなくフィッシュテールビットの耐久性が向上する。
【０００９】
第２の発明は、第１の発明における前記端部超硬チップ１１−２の有効摩耗代を前部超硬チップ１１−１の有効摩耗代よりも大きくしたシールド掘削機のフィッシュテールシールドビットである。
【００１０】
第２の発明によれば、最も摩耗の激しい前面と両端面の角部４ケ所に設けた端部超硬チップ１１−２の有効摩耗代が他の部分に設けた前部超硬チップ１１−１の有効摩耗代よりも大きいので、端部超硬チップ１１−２は前部超硬チップ１１−１と釣り合いのとれた同等の耐久性を持たせることができる。
【００１１】
【発明の実施の形態】
図１と図２に示すように、母材１０と超硬チップ１１と補助超硬チップ１２でフィッシュテールビット１３としてある。母材１０が円板状の取付板１４の前面中央に溶接等で固着されている。取付板１４がカッタヘッド１５の中央に固着される。溶接部分１６はクロスで図示してある。
【００１２】
前記母材１０はカッタヘッド１５の回転中心線１５ａと平行な長さ方向の両端面２０，２０と、この両端面２０，２０に連続して一方側には回転中心線１５ａに斜交する、例えばＶ字山形状の幅方向の前面２１と、この両端面２０，２０に連続して幅方向の他方側には後面２２と、厚さ方向の両側面２３，２３で所定の長さ、幅、厚さを有する板状体としてある。
【００１３】
前記超硬チップ１１は図３に示すように、母材１０の前面２１と両側面２３，２３が交わることによって形成されるコーナー部にそれぞれ形成したＬ字状の凹隅部２４にロー付け等で固着した複数の前部超硬チップ１１−１と、母材１０の前面２１と両側面２３，２３が交わることによって形成されるコーナー部及び母材１０の両端面２０と両側面２３，２３が交わることによって形成されるコーナー部における前面２１寄りに亘ってそれぞれ形成したＬ字状の凹陥部２５にそれぞれロー付け等で固着した端部超硬チップ１１−２を有する。この各前部超硬チップ１１−１、端部超硬チップ１１−２の側面１１ａは母材１０の両側面２３と面一となり、前部超硬チップ１１−１の前面１１ｂは母材１０の前面２１と面一で、端部超硬チップ１１−２の前面１１ｂは母材１０の前面２１ａと面一で、かつ端面１１ｃは母材１０の端面２０と面一となっている。
【００１４】
フィッシュテールビット１３は前述のように、カッタヘッド１５の回転中心線１５ａとほぼ平行な長さ方向の両端面と、幅方向の一方の前面と、幅方向の他方の後面と、厚さ方向の両側面を有する板状体で、その前面と両側面のコーナー部に前部超硬チップ１１−１がそれぞれ設けてあり、両端面の前面寄りと両側面とのコーナー部に端部超硬チップ１１−２がそれぞれ設けてある。
【００１６】
前記各前部超硬チップ１１−１と端部超硬チップ１１−２は所定の長さと幅と厚さを有する直方体形状であり、端部超硬チップ１１−２の幅ａは前部超硬チップ１１−１の幅ｂよりも大きく、端部超硬チップ１１−２の長さｃは前部超硬チップ１１−１の幅ｂよりも大きい。これによって、端部超硬チップ１１−２の有効摩耗代は前部超硬チップ１１−１の有効摩耗代よりも大きい。前記有効摩耗代とは摩耗する前の状態から土砂掘削不可能な状態までの摩耗寸法である。
【００１７】
前記補助超硬チップ１２は母材１０の前面２１における厚さ方向中央に形成した凹溝２６内に植め込まれて固着してある。
【００１８】
前記母材１０の前面２１及び母材１０の両側面２３，２３には硬化肉盛３０がそれぞれ施してある。
【００１９】
このようであるから、超硬チップ１１で掘削した掘削土砂は超硬チップ１１の側面１１ａに沿ってカッタヘッド１５に向けて移動するので、その掘削土砂によって母材１０の両側面２３，２３が削られることがなく、耐久性が向上する。
【００２０】
また、母材１０の両側面２３，２３における超硬チップ１１寄り部が硬化肉盛３０で補強されているから、超硬チップ１１の側面１１ａを通過した掘削土砂が母材１０の両側面２３，２３に沿ってカッタヘッド１５に向けて移動しても母材１０の両側面２３，２３が摩耗することがない。
【００２１】
また、補助超硬チップ１２で掘削された掘削土砂は母材１０の前面２１に沿って移動するが、この前面２１は硬化肉盛３０で補強されているので、その母材１０の前面２１が摩耗することがない。
【００２２】
以上の実施の形態では母材１０の前面２１が厚さ方向中央を境として厚さ方向に向けてＶ字形状となっているので、補助超硬チップ１２を取付けしたが、母材１０の前面２１が一直線状であれば補助超硬チップ１２を省略することが可能である。
【００２３】
なお、各超硬チップの母材よりも突出したコーナー部に面取りを施しても良いし、超硬チップ１１の側面１１ａを母材１０の側面２３に対して外方に向けて斜めとするすい角や母材１０の前面２１に対して外方へ向けて斜めとする逃げ角をつけても良い。
【図面の簡単な説明】
【図１】本発明の実施の形態を示すフィッシュテールビットの側面図である。
【図２】図１の正面図である。
【図３】図１のＡ−Ａ拡大断面図である。
【図４】従来のフィッシュテールビットの不具合説明図である。
【符号の説明】
１…超硬チップ
２…掘削土砂
３…母材
３ａ…前面
１０…母材
１１…超硬チップ
１１−１…前部超硬チップ
１１−２…端部超硬チップ
１１ａ…側面
１１ｂ…前面
１１ｃ…端面
１２…補助超硬チップ
１３…フィッシュテールビット
１４…取付体
１５…カッタヘッド
１５ａ…回転中心線
１６…溶接部
２０…端面
２１…前面
２２…後面
２３…側面
２４…凹陥部
２５…凹陥部
２６…凹部
３０…硬化肉盛[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fishtail bit attached to the center of a cutter head of a shield excavator.
[0002]
[Prior art]
As a fish tail bit of a shield excavator, for example, the one shown in Japanese Utility Model Registration No. 2510379 is known. This fishtail bit is composed of a plate-like base material having both end faces parallel to each other, a front surface that is continuous with the both end faces and substantially V-shaped, and thicknesses at both end faces and the front face of the base material. It is made of cemented carbide chips implanted continuously in the center in the direction.
[0003]
[Problems to be solved by the invention]
In the case of the above-described fishtail bit, the excavated earth and sand 2 excavated by the cemented carbide tip 1 moves toward the cutter head along the surface 3a of the base material 3 as shown in FIG. As a result, the surface 3a of the base material 3 protruding from the thickness dimension of the cemented carbide chip 1 is shaved, and the base material 3 is severely worn.
[0004]
When the base material 3 is worn, the support margin of the cemented carbide tip 1 is reduced and the cemented carbide tip 1 is dropped.
[0005]
Therefore, an object of the present invention is to provide a fishtail bit for a shield excavator that can solve the above-described problems.
[0006]
[Means for solving the problems and actions / effects]
The first invention is a fish tail bit that is attached to the center of a cutter head 15 of a shield excavator and is formed of a base material 10 and a carbide tip 11.
The base material 10 includes both end faces at both ends in the length direction substantially parallel to the rotation center line 15a of the cutter head 15, a front surface oblique to the rotation center line 15a on one side in the width direction, and the cutter head 15 A plate-like body of a predetermined length, width and thickness having a rear surface on the other side in the width direction and both side surfaces on both sides in the thickness direction,
The cemented carbide tip 11 is provided with a front carbide tip 11-1 provided at each corner formed by the front surface and both side surfaces of the base material 10 intersecting, and both end surfaces and both side surfaces of the base material 10 are It is a fish tail bit of a shield excavator, characterized in that it is formed by end carbide tips 11-2 provided near the front surface in a corner portion formed by crossing .
[0007]
According to the first invention, the excavated earth and sand excavated by the cemented carbide tip 11 moves toward the cutter head 15 along the side surface 11a of the cemented carbide chip 11, and therefore the side surface of the base material 10 is cut by the excavated earth and sand. It is never done.
[0008]
This improves the durability of the fishtail bit without the base material 10 being worn and the carbide tip 11 falling off.
[0009]
The second invention is a fishtail shield bit of a shield excavator in which the effective wear allowance of the end carbide tip 11-2 in the first invention is larger than the effective wear allowance of the front carbide tip 11-1. is there.
[0010]
According to the second invention, the front carbide tip 11- provided with the effective wear allowance of the end carbide tip 11-2 provided at the four corners of the front surface and both end surfaces with the most wear is provided at other portions. Since the effective wear allowance of 1 is larger, the end cemented carbide tip 11-2 can have equivalent durability balanced with the front cemented carbide tip 11-1.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 and 2, a fish tail bit 13 is formed by a base material 10, a carbide tip 11, and an auxiliary carbide tip 12. The base material 10 is fixed to the center of the front surface of the disc-shaped mounting plate 14 by welding or the like. The mounting plate 14 is fixed to the center of the cutter head 15. The welded portion 16 is shown as a cross.
[0012]
The base material 10 has both end faces 20 and 20 in the length direction parallel to the rotation center line 15a of the cutter head 15, and the end faces 20 and 20 are oblique to the rotation center line 15a on one side. For example, the V-shaped mountain-shaped front surface 21 in the width direction, the rear surface 22 on the other side in the width direction following the both end surfaces 20 and 20, and the predetermined length and width on both side surfaces 23 and 23 in the thickness direction. The plate-like body has a thickness.
[0013]
As shown in FIG. 3, the cemented carbide chip 11 is brazed to an L-shaped concave corner 24 formed at each corner formed by the front surface 21 and both side surfaces 23, 23 of the base material 10 crossing each other. A plurality of front cemented carbide chips 11-1, which are fixed together, a corner portion formed by crossing the front surface 21 and both side surfaces 23, 23 of the base material 10, and both end surfaces 20 and both side surfaces 23, 23 of the base material 10. The end cemented carbide chip 11-2 is fixed to each of the L-shaped concave portions 25 formed near the front surface 21 in the corner portion formed by crossing each other by brazing or the like. The side surfaces 11a of the front carbide tips 11-1 and the end carbide tips 11-2 are flush with the side surfaces 23 of the base material 10, and the front surface 11b of the front carbide tips 11-1 is the base material 10. The front surface 11b of the end cemented carbide chip 11-2 is flush with the front surface 21a of the base material 10, and the end surface 11c is flush with the end surface 20 of the base material 10.
[0014]
As described above, the fishtail bit 13 has both end surfaces in the length direction substantially parallel to the rotation center line 15a of the cutter head 15, one front surface in the width direction, the other rear surface in the width direction, and the thickness direction. It is a plate-like body having both side surfaces, and front carbide tips 11-1 are provided at the corners of the front surface and both side surfaces, respectively, and the end carbide chips at the corner portions between the front surface side and both side surfaces of both end surfaces. 11-2 are provided.
[0016]
Each of the front carbide tips 11-1 and the end carbide tips 11-2 has a rectangular parallelepiped shape having a predetermined length, width, and thickness. It is larger than the width b of the hard tip 11-1, and the length c of the end carbide tip 11-2 is larger than the width b of the front carbide tip 11-1. Thus, the effective wear allowance of the end carbide tip 11-2 is larger than the effective wear allowance of the front carbide tip 11-1. The effective wear allowance is a wear dimension from a state before wear to a state where sediment excavation is impossible.
[0017]
The auxiliary carbide tip 12 is implanted and fixed in a concave groove 26 formed in the center of the front surface 21 of the base material 10 in the thickness direction.
[0018]
The front surface 21 of the base material 10 and both side surfaces 23 and 23 of the base material 10 are each provided with a hardfacing 30.
[0019]
Thus, since the excavated earth and sand excavated with the cemented carbide tip 11 moves toward the cutter head 15 along the side surface 11a of the cemented carbide chip 11, both side surfaces 23 and 23 of the base material 10 are caused by the excavated earth and sand. Durability is improved without being cut.
[0020]
Further, since the hard chip 11 closer portions on both side surfaces 23, 23 of the base material 10 are reinforced with the hardfacing 30, the excavated earth and sand that has passed through the side surface 11 a of the carbide tip 11 is the both side surfaces 23 of the base material 10. , 23, the side surfaces 23, 23 of the base material 10 are not worn even if they move toward the cutter head 15.
[0021]
In addition, the excavated earth and sand excavated by the auxiliary carbide tip 12 moves along the front surface 21 of the base material 10, but the front surface 21 of the base material 10 is reinforced by the hardfacing 30. There is no wear.
[0022]
In the above embodiment, since the front surface 21 of the base material 10 is V-shaped toward the thickness direction with the center in the thickness direction as a boundary, the auxiliary carbide tip 12 is attached. If 21 is a straight line, the auxiliary carbide tip 12 can be omitted.
[0023]
Chamfering may be applied to the corner portion protruding from the base material of each cemented carbide tip, and the side surface 11a of the cemented carbide tip 11 is inclined obliquely outward with respect to the side surface 23 of the base material 10. A clearance angle that is inclined outward with respect to the corners or the front surface 21 of the base material 10 may be provided.
[Brief description of the drawings]
FIG. 1 is a side view of a fishtail bit showing an embodiment of the present invention.
FIG. 2 is a front view of FIG. 1;
FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.
FIG. 4 is a diagram for explaining a defect of a conventional fish tail bit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Carbide tip 2 ... Drilling earth and sand 3 ... Base material 3a ... Front surface 10 ... Base material 11 ... Carbide tip 11-1 ... Front carbide tip 11-2 ... End carbide tip 11a ... Side surface 11b ... Front surface 11c ... end face 12 ... auxiliary carbide tip 13 ... fish tail bit 14 ... attachment body 15 ... cutter head 15a ... rotation center line 16 ... welded part 20 ... end face 21 ... front face 22 ... rear face 23 ... side face 24 ... recessed part 25 ... recessed part 26: Recess 30 ... Hardening

Claims (2)

シールド掘削機のカッタヘッド（１５）中央に取付けられ、母材（１０）と超硬チップ（１１）で形成されたフィッシュテールビットにおいて、
前記母材（１０）を、前記カッタヘッド（１５）の回転中心線（１５ａ）とほぼ平行な長さ方向両端の両端面と、幅方向一方側で、前記回転中心線（１５ａ）に斜交する前面と、前記カッタヘッド（１５）に取付けられる幅方向他方側の後面と、厚さ方向両側の両側面を有する所定の長さと幅と厚さの板状体とし、
前記超硬チップ（１１）を、前記母材（１０）の前面と両側面が交わることによって形成されるコーナー部にそれぞれ設けた前部超硬チップ（１１−１）と、前記母材（１０）の両端面と両側面が交わることによって形成されるコーナー部における前面寄りにそれぞれ設けた端部超硬チップ（１１−２）で形成したことを特徴とするシールド掘削機のフィッシュテールビット。In the fish tail bit attached to the cutter head (15) center of the shield excavator and formed of the base material (10) and the carbide tip (11),
The base material (10) is obliquely crossed with the rotation center line (15a) at both end faces in the length direction substantially parallel to the rotation center line (15a) of the cutter head (15) and on one side in the width direction. A plate-like body having a predetermined length, width, and thickness, having a front surface to be mounted, a rear surface on the other side in the width direction attached to the cutter head (15), and both side surfaces on both sides in the thickness direction,
A front carbide tip (11-1) provided on the corner portion formed by intersecting the front surface and both side surfaces of the carbide material (11) with the carbide material (11), and the matrix material (10). The fishtail bit of the shield excavator, characterized in that it is formed by end carbide tips (11-2) provided near the front surface at the corner portion formed by the intersection of both end surfaces and both side surfaces of (1) . 前記端部超硬チップ（１１−２）の有効摩耗代を前部超硬チップ（１１−１）の有効摩耗代よりも大きくした請求項１記載のシールド掘削機のフィッシュテールビット。The fishtail bit of the shield excavator according to claim 1, wherein an effective wear allowance of the end carbide tip (11-2) is larger than an effective wear allowance of the front carbide tip (11-1).
JP13466497A 1997-05-26 1997-05-26 Fish excavator fishtail bit Expired - Fee Related JP3759286B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13466497A JP3759286B2 (en) 1997-05-26 1997-05-26 Fish excavator fishtail bit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13466497A JP3759286B2 (en) 1997-05-26 1997-05-26 Fish excavator fishtail bit

Publications (2)

Publication Number Publication Date
JPH10325292A JPH10325292A (en) 1998-12-08
JP3759286B2 true JP3759286B2 (en) 2006-03-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP13466497A Expired - Fee Related JP3759286B2 (en) 1997-05-26 1997-05-26 Fish excavator fishtail bit

Country Status (1)

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JP (1) JP3759286B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103061775A (en) * 2012-11-15 2013-04-24 山东天工岩土工程设备有限公司 Fishtail center cutter for shield machine
CN111894612A (en) * 2020-08-11 2020-11-06 中铁电气化局集团有限公司 Wear-resisting gauge protection tearing knife

Also Published As

Publication number Publication date
JPH10325292A (en) 1998-12-08

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