JPH0312873Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a disc cutter used for excavating rock, etc.

Conventional technology Conventionally, a disk cutter (for example, a roller bit) for excavating rock, etc. has been used as shown in Fig. 2.
A support shaft 1 and two types of bearings 2 and 3 on this support shaft 1.
A disk body 4 rotatably supported via
and a dust seal 5 interposed between the disk body 4 and the support shaft 1 to prevent dirt from entering.

Problems that the invention aims to solve By the way, the ground that has traditionally been excavated by tunnel boring machines is rock, and because the face is self-supporting, the inside of the pressure chamber is at atmospheric pressure. Therefore, a low-pressure dust seal was sufficient as the seal used in the disk cutter. However, the ground targeted by shield tunneling machines is highly collapsible ground that is not self-sustaining, and there is also groundwater pressure, so pressure is applied inside the pressure chamber to counter the groundwater pressure and collapsed earth pressure. There is. Therefore, when the disk cutter is used in a shield excavator, there is a problem in that earth and sand and groundwater infiltrate between the support shaft and the disk body.

Therefore, an object of the present invention is to provide a disk cutter that solves the above problems.

Means for Solving the Problems In order to solve the above problems, the disk cutter of the present invention includes a support shaft and a disk body rotatably supported by the support shaft via a bearing. An oil seal is interposed between the disc body and the oil seal, and a cover body to protect the oil seal is attached to the support shaft.
The outer circumferential bent end bent inward is inserted into an annular recess formed in the disk body, and a dust seal is interposed between the disk body and the outer circumferential bent end of the cover body. .

Operation With the above configuration, when collapsible ground is excavated, the dust seal prevents most of the earth and sand from entering, and the oil seal completely prevents the pressurized water from entering.

In addition, since the dust seal is placed inside the annular recess, the dust seal itself is protected, and even if dirt, etc. passes through the dust seal,
Since the gap between the outer circumferential bent end of the cover body and the annular recess is a complicated passage, earth and sand cannot easily penetrate to the oil seal.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIG. The disk cutter according to the present invention has a support shaft 11
and a disk body 14 that is rotatably supported by the support shaft 11 via two types of bearings 12 and 13, in which an oil seal 15 that can withstand pressure is provided between the support shaft 11 and the disk body 14.
An annular cover body 16 for protecting the oil seal 15 is installed on the boss portion 11 of the support shaft 11.
At the same time, bolts 17 are fixed to the disk body 14, and the outer circumferential bent end 16a bent inward is fixed to the disk body 14.
The outer bent end 16 of the cover body 16 is inserted into the annular recess 14a formed on both sides of the cover body 16.
A dust seal 18 for preventing dirt and sand from entering is interposed between a and the disk body 14. In addition,
In the figure, numerals 19 and 20 are carbide tips for drilling, respectively.

Therefore, in the above configuration, when collapsible ground is excavated, the dust seal 18 prevents most of the earth and sand from entering, and the oil seal 15 completely prevents the pressurized water from entering. Ru.

Further, since the dust seal 18 is disposed within the annular recess 14a, the dust seal 18 itself is protected, and even if dirt or the like passes through the dust seal 18, the outer circumferential bent end 1 of the cover body 16
Since the gap between the annular recess 6a and the annular recess 14a is a complicated passage, dirt, etc. can easily penetrate the oil seal 15.
It cannot penetrate up to the point.

Effects of the invention According to the disc cutter of the invention described above, most of the dirt, etc. is prevented from entering by the dust seal, and pressurized water, etc. is completely prevented from entering by the oil seal, and therefore the disintegration property is reduced. It can also be used as a shield excavator for ground excavation.

In addition, since the dust seal is placed inside the annular recess, the dust seal itself is protected, and even if dirt, etc. passes through the dust seal,
Since the gap between the outer circumferential bent end of the cover body and the annular recess is a complicated passage, earth and sand cannot easily penetrate to the oil seal.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 11... Support shaft, 12, 13... Bearing, 14...
...Disc body, 14a... Annular recess, 15...
Oil seal, 16...Cover body, 16a...Outer circumference bent end, 18...Dust seal.

Claims (1)

[Scope of utility model registration request] In a disk cutter consisting of a support shaft and a disk body rotatably supported by the support shaft via a bearing, an oil seal is interposed between the support shaft and the disk body, and a cover for protecting the oil seal. Attach the body to the support shaft, and insert the inwardly bent outer circumferential bent end into the annular recess formed in the disk body, and between the disk body and the outer circumferential bent end of the cover body. A disk cutter featuring a dust seal.