JP2574148Y2 - Disk cutter wear detector of shield machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cutter wear detecting device of a shield machine for detecting wear of a disk cutter provided on a cutter head.

[0002]

2. Description of the Related Art Conventionally, a shield machine for excavating a tunnel is provided with a cutter head which is rotated and driven by a cutter head motor at a front portion of a shield body. Also, on the front surface of the cutter head, there are provided a large number of disc cutters which rotate and excavate the face with the rotation of the cutter head, and when these disc cutters are worn, the cutting force is reduced and the excavation speed is reduced. For this reason, conventionally, when excavating a certain distance, the worker goes out between the face and the cutter head,
The wear of the disk cutter was artificially measured using a jig or the like.

[0003]

However, in this method, there is a possibility that the ground may collapse or water may flow out during the measurement, and there is a problem that the operation is dangerous. In order to avoid danger, it is necessary to stop excavation and inject a coagulant or other chemical into the ground to improve the ground.During this time, the excavation work is interrupted, which causes problems such as a longer construction period. is there. This invention has been made for the purpose of remedying such a problem, and it is an object of the invention to provide a disk cutter wear detection device of a shield excavator capable of easily measuring the wear of a disk cutter in a shield body. is there.

[0004]

According to the present invention, in order to achieve the above object, a plurality of disk cutters are provided on a front surface of a cutter head rotatably provided at a front portion of a shield body, and these disk cutters are used. In a shield machine that excavates a face, a hydraulic jack is provided in the vicinity of the disk cutter, and a detector is pressed against an outer peripheral portion of the disk cutter by the hydraulic jack, and a stroke at this time is detected by a stroke detector. Then, the wear amount of the disk cutter is displayed on a wear amount indicator provided in the shield body.

[0005]

According to the above construction, since the wear amount of the disk cutter can be confirmed in the shield body, it is not necessary for the operator to go out between the face and the cutter head and measure the wear amount artificially.

[0006]

An embodiment of the present invention will be described in detail with reference to the drawings. 1 is a cross-sectional view of the shield machine, FIG. 2 is an enlarged view of a circle A in FIG. 1, FIG. 3 is a side view of a disk cutter wear detector, and FIG.

In FIG. 1, reference numeral 1 denotes a shield main body, and a cutter head 2 rotatably driven by a cutter head motor 3 is provided at a front portion. A plurality of spokes 2a are provided on the front surface of the cutter head 2 in a radial direction, and a plurality of disk cutters 4 are rotatably mounted on the spokes 2a. And these disk cutters 4
As the cutter head 2 rotates, the face 5 is rotated by friction with the face 5 to excavate the face 5, and the excavated earth and sand is taken into the chamber 1 a at the front part of the shield body 1 from between the spokes 2 a and then the screw conveyor. 6 according to chamber 1a
It is carried out from the inside and further conveyed rearward by an earth and sand conveying device (not shown).

On the other hand, in the vicinity of the disk cutter 4 located on the outer peripheral side of the cutter head 2, a main body 8 of the disk cutter wear detecting device of the present invention is installed. As shown in FIGS. 3 and 4, the main body 8 is a spoke 2 of the cutter head 2.
a jack case 9 is fixed to the trunnion 11 in the jack case 9.
Is supported through. The hydraulic jack 10 has a piston rod 10a protruding in the direction of the disk cutter 4, and a detector 12 is attached to a tip of the piston rod 10a. The detector 12 is slidably supported by a cylindrical guide 13 attached to the end surface of the jack case 9, and the tip can be pressed against the outer peripheral surface of the disk cutter 4 by the hydraulic jack 10. Along with
A nozzle 15 for ejecting water toward the tip of the detector 12 is attached to the guide section 13 so as to wash the earth and sand attached to the disk cutter 4.

The hydraulic jack 10 is supplied with hydraulic pressure by a hydraulic pipe 16.
At the rear end of the hydraulic jack 10, a stroke detector 17 for detecting a stroke of the piston rod 10a is incorporated. The stroke amount detected by the stroke detector 17 is sent to an operation panel installed in the shield main body 1 by a cable 18 extending from the jack case 9, and a wear amount indicator (both are provided on the operation panel). (Not shown), the wear amount of the disk cutter 4 is digitally displayed. Reference numeral 19 in the drawing denotes a cleaning water supply pipe for supplying water to the nozzle 15 provided on the guide portion 9a.

Next, the operation will be described. The shield main body 1 is propelled while rotating the cutter head 2 by the cutter head motor 3 to excavate a tunnel. After excavating a certain distance, the wear of the disk cutter 4 is measured. The cutter head 2 is stopped. Then, water is supplied from the cleaning water supply pipe 19 to the nozzle 15, and the water ejected from the nozzle 15 is used to wash the soil attached to the disk cutter 4. To extend the piston rod 10a.
a detector 12 attached to the tip of the disk cutter 4
3 and 4, as shown in FIGS. Then, the stroke of the piston rod 10 at this time is detected by the stroke detector 17 and sent to the operation panel in the shield body 1.

The control unit of the operation panel has a disk cutter 4 in advance.
The stroke of the piston rod 10a in a state where the piston rod 10a is not worn is stored as a reference value, and the stroke detector 17
The amount of wear of the disk cutter 4 is calculated from the stroke value sent from the controller and the reference value, and is digitally displayed on a wear amount display. Thus, the operator can confirm the wear amount of the disk cutter 4 only by looking at the numerical value displayed on the wear amount display. In the above-described embodiment, the main body 8 of the wear detecting device is provided near the disk cutter 4 provided on the outer peripheral side of the cutter head 2. This is because the outermost disk cutter 4 is most likely to be worn. The main body 8 may be provided in the vicinity of the disk cutter 4 at the location (1).

[0012]

[Effects of the Invention] As described in detail above, since the wear condition of the disk cutter can be confirmed in the shield body, an operator comes out between the face and the cutter head as in the conventional case, and the disk There is no need to measure the wear of the cutter. This eliminates the need for dangerous measurement work and eliminates the need to inject chemicals into the ground to take measures to prevent ground collapse and flooding, thereby shortening the construction period and reducing costs associated with them. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shield machine using a disk cutter wear detecting device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a circle A in FIG. 1;

FIG. 3 is a side view of a disk cutter wear detecting device according to an embodiment of the present invention.

FIG. 4 is a plan view of a disk cutter wear detection device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield body 2 Cutter head 4 Disk cutter 10 Hydraulic jack 12 Detector 17 Stroke detector

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 9/08 E21D 9/10

Claims (1)

(57) [Scope of request for utility model registration] 1. A shield excavator in which a plurality of disk cutters 4 are provided on a front surface of a cutter head 2 rotatably provided at a front portion of a shield main body 1, and these disk cutters 4 excavate a face 5. In the above, a hydraulic jack 10 is provided near the disk cutter 4, and the detector 12 is pressed against the outer peripheral portion of the disk cutter by the hydraulic jack 10, and the stroke at this time is detected by the stroke detector 1.
7. A disk cutter wear detecting device for a shield machine which detects the wear amount of the disk cutter on a wear amount indicator provided in the shield main body 1 and detects the wear amount of the disk cutter.