JPH0342896U

JPH0342896U -

Info

Publication number: JPH0342896U
Application number: JP10318889U
Authority: JP
Priority date: 1989-09-04
Filing date: 1989-09-04
Publication date: 1991-04-23

Description

[Brief explanation of drawings]

図面はこの考案の一実施例を示し、第１図はシ
ールド掘進機の断面図、第２図は同正面図、第３
図はカツタ装置の断面図、第４図は第３図方向
からの矢視図、第５図はストツパの説明図、第６
図および第７図は作用説明図である。１……シールド本体、２……カツタモータ、３
……カツタヘツド、４ａ……支持部材、４ｃ……
シリンダ、６……外部カツタビツト、７……保護
板、８……内部カツタビツト、９……ストツパ、
１３……推進ジヤツキ。 The drawings show one embodiment of this invention, with Fig. 1 being a sectional view of the shield tunneling machine, Fig. 2 being a front view of the same, and Fig. 3 being a sectional view of the shield tunneling machine.
The figure is a sectional view of the cutter device, Figure 4 is a view taken from the direction of Figure 3, Figure 5 is an explanatory diagram of the stopper, and Figure 6
FIG. 7 and FIG. 7 are action explanatory diagrams. 1...Shield body, 2...Katsuta motor, 3
...Cut head, 4a...Support member, 4c...
Cylinder, 6...External cutter bit, 7...Protection plate, 8...Inner cutter bit, 9...Stopper,
13... Propulsion jack.

Claims

[Scope of Claim for Utility Model Registration] (1) In a shield excavator that excavates a tunnel by propelling a shield body 1 having a cutter head 3 in the front part which is freely rotatable by a cutter motor 2 into the ground by a propulsion jack 13, A large number of external cutter bits 6 supported by support members 4a are provided on the front surface of the cylinder 3, and inside each support member 4a is a cylinder 4c whose front opening is closed by a protection plate 7 that falls off as the outer cutter bits 6 wear out. In addition to providing the above-mentioned cylinder 4
This cutter device for a shield excavator is provided with an internal cutter bit 8 that protrudes forward when a protective plate 7 falls off inside c. (2) The cutter device according to claim (1), wherein the internal cutter bit 8 is pushed forward by a biasing means such as hydraulic pressure or a compression spring. (3) The cutter device according to claim (1), further comprising a stopper 9 for locking the internal cutter bit 8 in the protruding position.