JPH0144630Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutter device for a rock tunnel excavator.

A rock tunnel excavator excavates a cutting blade by rotating a cutter head equipped with a cutter device to excavate a tunnel to construct a tunnel.The cutter device is subjected to a large load, so the cutter device must be strong. It won't happen.

For example, as shown in FIG. 1, a shaft 2 is fitted between a pair of retainers 1, 1 and fixed with bolts 3, and an annular cutter hub 5 is rotatably attached to the shaft 2 via a pair of bearings 4, 4. An annular integral cutter ring 6 is fitted and press-fitted into the cutter hub 5 to abut against the stepped portion 7, and is prevented from coming off by a retaining ring 8.

If the cutter ring 6 is worn out,
Remove the entire cutter device from the cutter head, remove the retaining ring 8, pull out the cutter ring 6 from the cutter hub 5, press fit the new cutter ring 6 into the cutter hub 5 again, attach the retainer ring 8, reassemble it, and attach it to the cutter head again. ing.

For this reason, each time the cutter ring 6 is replaced, the entire cutter device must be removed from the cutter head, making the work of replacing the cutter ring very troublesome and time-consuming. It cannot be replaced at the excavation site because it requires special tools.

Furthermore, since the press-fitting surface 5a of the cutter hub 5 is damaged when the cutter ring 6 is press-fitted, the number of re-fittings is limited to about three times, and after that, the cutter hub 5 must be replaced, which is uneconomical.

This invention was developed in view of the above circumstances, and its purpose is to allow the cutter ring to be replaced while it is still attached to the cutter head, making it easy to replace in a short time, and to be able to be replaced at the excavation site without the need for special tools. To provide a cutter device for a rock tunnel excavator which is economical and can prolong the life of the cutter hub, allowing the cutter ring to be replaced many times.

Embodiments of the present invention will be described below with reference to FIG. 2 and subsequent figures.

FIG. 2 is an overall explanatory diagram, and shows the front frame 10.
A cutter head 11 is mounted to be rotatably driven by a motor 12, a gripper frame 13 is provided at the rear of the front frame 10, and a propulsion cylinder 14 is provided between the gripper frame 13 and the front frame 10.
A front roof 15 is provided on the upper part of the front frame 10 facing rearward, and a rear roof 16 is fixedly installed on the gripper frame 13 facing forward. In addition to overlapping each other, the gripper frame 13 has a rear gripper 1.
7 is provided as a cylinder 18 that protrudes laterally and is retractable, and the front frame 10 is also provided with a gripper (not shown).

A cutter device A is provided in front of the cutter head 11.
There are several.

Then, the gripper 17 is pressed against the tunnel wall B to receive the reaction force of propulsion, and the propulsion cylinder 14 is extended to press the cutter head 11 against the rock face C. At the same time, the motor 12 drives the cutter head 11 to rotate. By rotating the cutter ring 19 of the device A while cutting into the face C of the bedrock, the bedrock is crushed and a tunnel is continuously constructed in the bedrock.

As shown in FIGS. 5 and 6, the cutter device A has a shaft 21 fitted between a pair of retainers 20 and 20 and connected with bolts 22, and an annular ring attached to the shaft 21 via a pair of bearings 23. A cutter hub 24 is rotatably supported, and first and second step portions 25 and 26 are formed on the outer circumferential surface of the cutter hub 24 to form a shape having a small diameter portion 27 and a large diameter portion 28. Part 2
Cutting rings 19 are attached to 5 and 26.

The cutter ring 19 has a structure in which a plurality of arcuate unit cutters 29 are connected in a continuous annular manner, and the inner wall of the unit cutter ring 29 has a stepped portion 30 with a small diameter portion 31 and a large diameter portion 32. Thus, the stepped portion 30 is in close contact with the first stepped portion 25,
The large-diameter portion 32 is in close contact with the large-diameter portion 28, and the outer end surface 33 is fastened to the cutter hub 24 with bolts 34 so that the outer end surface 33 is in close contact with the second step portion 26, thereby forming an annular cutter ring 19 as a whole. In other words, the large diameter portion 32 of the unit cutter ring 29 is connected to the cutter hub 2.
It is concentric with the large diameter portion 28 of No. 4.

Since the unit cutter ring 29 can be removed from the cutter hub 24 by loosening the bolt 34, the cutter ring 19 can be replaced with the cutter device A still attached to the cutter head 11, and the cutter ring 19 can be replaced easily and in a short time. As a result, the downtime of the rock tunnel excavator can be shortened and the operating rate can be improved.

In addition, since the mounting surface (that is, the large diameter portion 28) of the cutter hub 24 is not damaged, the life of the cutter hub 24 can be extended, and the cutting process can be repeated many times.
It is economical because 9 can be replaced.

Further, since only a tool is needed to tighten and loosen the bolt 34, there is no need to use a dedicated special tool, and the bolt 34 can be replaced at the excavation site.

The present invention is as described above, and while the cutter device is still attached to the cutter head, cutting
9 can be replaced easily and in a short time, the downtime of the tunnel excavator due to cutter ring replacement can be shortened and the operating rate can be improved, and the lifespan can be increased without damaging the attachment part of the cutter hub 24.
It is economical because the cutter ring 19 can be replaced many times, and there is no need to use special tools, so the cutter ring 19 can be used at tunnel excavation sites, etc.
9 can be exchanged.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional example, Fig. 2 is an overall explanatory view showing an embodiment of the present invention, and Fig. 3 is a -
4 is a front view of FIG. 2, FIG. 5 is a side view of the cutter device, and FIG. 6 is a sectional view taken along the line -- of FIG. 5. 19 is a cutter ring, 20 is a retainer, 21 is a shaft, 23 is a bearing, 24 is a cutter hub, 29 is a unit cutter ring, and 34 is a bolt.

Claims (1)

[Scope of utility model registration request] A shaft 21 is fixed between a pair of retainers 20, 20, and a cutter hub 2 is connected to the shaft 21 via a bearing 23.
4 is rotatably supported, and a plurality of arc-shaped unit cutters 29 are consecutively tightened and fixed to the cutter hub 24 with bolts 34 to form an annular cutter ring 19. Device.