JPH0115759Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the cutter head structure of a shield tunneling machine, and in particular, the cutter bit is provided in the cutter head at a position separated from the attachment part of the support beam connected to the cutter head. The present invention relates to a structure of a cutter head of a shield excavator, in which cut earth and sand can easily flow into a cutter chamber at the rear of the cutter head without being obstructed by a support beam, and can reduce cutter load.

In a conventional shield excavator, as shown in FIGS. 1 and 2, a cutter head part b provided at the front end of a cylindrical shield frame a,
A beam-shaped support system is known in which the shield frame a is rotatably supported by a plurality of support beams c arranged in parallel along the axial direction. The cutter head part b has cutter spokes f and support spokes g that are radially provided between a central support part d and an outer peripheral frame part e. A cutter bit h is attached to the front surface of the cutter spoke f, and a support beam c is connected to the cutter spoke f. The rear end of the support beam c is connected to a support plate i, and the support plate i is rotatably supported by a shield frame a via a bearing, and a drive motor (not shown) is connected to the support plate i.

In a conventional shield tunneling machine using a beam type support system, the support beam c is attached to the cutter spoke f. This is because the cutter spoke f receives the cutting reaction force of the cutter bit h during rock cutting, so the main objective is to increase the rigidity of the cutter spoke f. However, cutter spoke f with cutter bit h attached
When the support beam c is connected to the support beam c, as shown in FIG. Since there is a support beam c serving as a shield in the direction of the inflow of earth and sand, the resistance to taking in the earth and sand is large and the load on the cutter increases. (In Fig. 3, A is the rotating direction of the cutter head part b, B is the digging direction of the shield tunneling machine, and C is the cutting direction of the cutter bit h.) The present invention effectively solves the above-mentioned conventional problems. The purpose of the present invention is to provide a cutter head structure for a shield excavator that can reduce the inflow resistance when the earth and sand cut by the cutter bit flows into the cutter chamber, and reduce the load on the cutter. There is a particular thing.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 4, reference numeral 1 denotes a cylindrical shield frame, and a cutter head 2 is provided at the front end of the shield frame 1. As shown in FIGS. 4 and 5, the cutter head section 2 includes a central support section 3, an annular outer peripheral frame section 4 provided on the outside thereof, and cutter spokes 5 and radially connecting these sections. It is mainly composed of support spokes 6. Three cutter spokes 5 and three support spokes 6 are provided alternately and at equal intervals along the outer peripheral frame portion 4. On both sides of the front surface of each cutter spoke 5, soil intake ports 7 formed between the cutter spoke 5 and the support spoke 6 are provided at appropriate intervals along the radial direction of the cutter spoke 5. A cutter bit 8 is attached.

The support spokes 6 are members for increasing the rigidity of the cutter head portion 2, and the attachment portions 6a of the support spokes 6 to the outer peripheral frame portion 4 are formed to expand in the radial direction of the shield frame 1 as shown in the figure. There is. A support beam 9 that rotatably supports the cutter head 2 is connected to the attachment portion 6a of each support spoke 6. The support beam 9 is
It is provided along the axial direction of the shield frame 1 and close to the inner circumferential wall of the shield frame 1 that partitions the cutter chamber 10 behind the cutter head portion 2 . The rear end of the support beam 9 is connected to a support plate 11
The support plate 11 is rotatably supported by a bearing 12. Further, a cutter motor 13 for rotationally driving the support plate 11 is connected to the support plate 11 via a gear 14 . An input end of a screw conveyor 15 is inserted into the cutter chamber 10. Note that 16 is a shield jack, 17 is an over cutter, and 18 is a seal member for sealing the inside of the cutter chamber 10.

Next, the operation of this embodiment will be described.

The driving force of the cutter motor 13 is transmitted to the cutter head 2 via the gear 14, the support plate 11, and the support beam 9.
It is rotationally driven in the direction A shown in FIG. Furthermore, the cutter head portion 2 is driven forward in the B direction by the propulsive force of the shield jack 16. Therefore, the cutter bit 8 attached to the front surface of the cutter head portion 2 excavates in the combined direction C, and the cutter bit 8 cuts the ground 19. The cut earth and sand is taken into the cutter chamber 10 from the earth and sand intake port 7 of the cutter head 2, and is conveyed to the rear of the shield frame 1 by the screw conveyor 15.

Conventionally, a support beam is attached to the cutter spoke, which is a member mainly used for cutting the earth and scooping up cut earth and sand, and the support beam is attached to the cutter spoke to block the flow of earth and sand flowing into the cutter chamber. The support beams were located at the site and the support beams became obstacles, creating a large resistance to the inflow of earth and sand. However, in the present invention, the support beam 9 is connected not to the cutter spoke 5 but to a support spoke 6, which is a component of the cutter head that is not primarily used for cutting the earth 19 or scooping out cut earth and sand. Therefore, the sixth
As shown in the figure, the earth and sand inflow direction D when the cut earth and sand from the ground 19 cut by the cutter bit 8 flows into the cutter chamber 10 from the earth and sand intake port 7.
In addition, there is no support beam 9 that would be an obstacle blocking the inflow of earth and sand. Therefore, the cut earth and sand is smoothly taken into the cutter chamber 10 from the earth and sand intake port 7, and as a result, the inflow resistance of the earth and sand is small.
The load on the cutter motor 13 and the like for driving the cutter head 2 can be reduced. The cutter spokes 5, which receive the cutting reaction force of the cutter bit 8 during the cutting of the earth, have their rigidity increased by reinforcing members or the like.

In addition, in the above embodiment, cutter bit 8
The cutter spoke 5 to which the cutter spoke 5 is attached has a triangular cross-sectional shape, but it may have any shape such as a rectangle, a circle, or a chevron as shown in FIGS. 7A to 7C.

Further, the dimension H in the radial direction of the cutter head portion 2 of the cutter spoke 5 may be freely set as long as it does not inhibit the inflow of earth and sand. Further, the structure of the cutter head section is not limited to the above embodiment, and the cutter bit may be placed at a position apart from the cutter head attachment section of the support beam so that the support beam is not located in the inflow path of the earth and sand that is cut by the cutter bit and flows into the cutter chamber. The cutter head may have any structure as long as it is attached. In addition, the present invention can be applied to all mechanical shield excavators with a beam-shaped support system, regardless of the shield diameter, and the soil to be cut can be shielded over a wide range from soft clay to hard gravel and soft rock layers. Applicable to excavators.

In summary, according to the present invention, when the earth and sand cut by the cutter bit flows into the cutter chamber, there is no support beam that becomes an obstacle in the earth and sand inflow channel on the back side of the cutter bit, so the cut earth and sand can flow into the cutter chamber. As the soil flows smoothly into the cutter chamber and the resistance to uptake is small, the load on the cutter can be reduced, reducing the operating cost of the shield excavator.
Durability can be improved.

[Brief explanation of the drawing]

Figures 1 to 3 show a conventional shield tunneling machine, in which Figure 1 is a side cross-sectional view, Figure 2 is a front view, and Figure 3 is a cross-sectional view along the rotation direction of the cutter head. This is a developed diagram. Fig. 4 is a side sectional view showing an embodiment of the front part of a shield excavator equipped with a cutter head according to the present invention, Fig. 5 is a front view of the same, and Fig. 6 is a cross section of the cutter head along the rotation direction. FIG. 7 is a diagram showing another embodiment of the cutter spoke to which the cutter bit is attached, as viewed from the axial direction. In the figure, 1 is a shield frame, 2 is a cutter head, 5 is a cutter spoke, 6 is a support spoke, 7 is a sand intake port, 8 is a cutter bit, 9 is a support beam, 10 is a cutter chamber, 13 is a cutter motor, 15 16 is the screw conveyor, 16 is the shield jack, 19 is the ground, and D is the earth and sand inflow direction.

Claims (1)

[Scope of utility model registration request] A cutter head of a shield excavator is provided at the front end of a cylindrical shield frame and is rotatably supported by a plurality of support beams extending along the axial direction of the shield frame, and is connected to the cutter head. A structure of a cutter head portion of a shield excavator, characterized in that a cutter bit is disposed at a position spaced apart from a mounting portion of the support beam.