JPS6124629Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an over-digging device for a shield excavator.

In peripheral support type mechanical shields, there are overcutting devices and copy cutting devices as devices for excavating more than the outer diameter of the shield in order to correct the direction of curve construction. In Figures 1 to 4, the first
The figure shows an overcutting device, and FIG. 3 shows a copying cutting device, and FIGS. 2 and 3 are hydraulic system diagrams thereof.

The overcutting device a is a device that uses a hydraulic jack c to project an overcutting bit from the outer periphery of a cutter b, and attempts to excavate more than the outer diameter of the shield by rotating the cutter.

Therefore, once the overcut cutter a is set, the overcutting will be done uniformly over the entire circumference of the shield.
In addition, in order to adjust the overcut amount, the cutter must be stopped at one end, hydraulic piping d (connected with connector e) must be connected, and the cutter must be rotated again to excavate.

On the other hand, in the copy cutter device, a rotary joint f is provided at the center of the cutter b to perform rotational conversion, so that the amount of protrusion of the copy cutter g can be adjusted by the telescopic operation of the copy cutter jack h while the cutter is rotating.

Therefore, by providing a proximity switch in synchronization with the rotation of the cutter, it becomes possible to perform contour excavation such as overcutting only the upper half or overcutting only the left half. However, the disadvantage of the copy cutter is that the rotary joint is installed in the center of the cutter, so it is constantly exposed to excavated soil and has a high probability of failure, especially when there is a lot of gravel.

Therefore, the present invention compensates for the drawbacks of the copy cutter described above with a simple structure.

The purpose is to provide an over-digging device for a shield excavator with improved reliability of the over-digging cutter, and it can be used as an over-cutting device even when the rotary joint, which is the heart of the conventional copy cutter, breaks down.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 5 is a schematic side sectional view showing an embodiment of the over-digging device of the shield tunneling machine according to the present invention, and FIG. 6 is a hydraulic system diagram thereof.

1 is the shield body, 2 is a cutter rotatably supported around the shield body 1, and 3 is the shield body 1.
This is a hydraulic motor installed in the hydraulic motor 3, which operates the hydraulic motor 3 and rotates the cutter 2 via a sprocket and gears. 4 is a rotary joint (rotation converter) provided at the center of the cutter, 5 is a copy cutter provided on the outer periphery of the cutter 2, 6 is a copy cutter jack that changes the amount of expansion and contraction of the copy cutter 5, and 7 is the rear position of the bulkhead 8. The connector part 7 has a connector 9 and a gate valve 10.

As shown in FIG. 6, the hydraulic system is connected to the copy cutter jack 6 by piping so that the pressure oil that has passed through the rotary joint 4 from the power unit is sent to the copy cutter jack 6 via the connector section 7. The piping from the rotary joint 4 to the rotary joint 4 is located in the rotating part, and the piping from the rotary joint 4 to the power unit is located in the fixed part.

The connector 9 is a coupler that allows pressurized oil to be supplied when the hose is connected, and blocked when the hose is disconnected.

The cutter 2 is rotationally driven by the operation of the hydraulic motor 3 to excavate the face. At that time, copy Katsuta 5
When operating, the gate valve 10 is opened and pressure oil is supplied from the power unit to the copy cutter jack 6 via the rotary joint 4. On the other hand, if you want to use copy cutter 5 as an overcut cutter,
The gate valve 10 is closed, the power unit is connected directly to the connector 9, and pressurized oil is supplied to the copy cutter jack 6 from the power unit via the connector 9.

Generally, there is excavated earth and sand in the park head 8, and the rotary joint 4 is in constant contact with this earth and sand, and due to the nature of the rotary joint 4, the piping must be drawn out from the center of the cut.
In many cases, the piping is often damaged and cannot be used as a copy cutter 5. In such a case, according to this embodiment, by closing the gate valve 10, the power unit and the connector 9 can be connected and used as an overcut.

In short, according to the present invention, a cutter having a copy cutter jack is rotatably supported on a shield main body, a rotary joint is provided in the center of the cutter, and a power unit installed in the shield main body and the copy cutter jack are rotatably supported. In the over-digging device of a peripheral support type shield excavator that is connected via a joint with hydraulic piping, the copy cutter jack and rotary joint are connected via a connector gate valve installed in the cutter at the rear of the bulkhead. Therefore, even if the rotary joint malfunctions, the gate valve can be closed and the cutter can be used as an overcut cutter instead of a copy cutter, which is useful in practice.

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing an example of an overcutter, which is an over-digging device of a conventional shield excavator, Figure 2 is a hydraulic system diagram, and Figure 3 is a side sectional view showing an example of a copy cutter, which is a conventional over-digging device. 4 is a hydraulic system diagram thereof, FIG. 5 is a side sectional view showing an embodiment of the over-digging device of a shield excavator according to the present invention, and FIG. 6 is a hydraulic system diagram thereof. 1...Shield body, 2...Katsuta, 3...Hydraulic motor, 4...Rotary joint, 5...Copy cutter, 6...Copy cutter jack, 7...
... Connector section, 8 ... Bulkhead, 9 ... Connector, 10 ... Gate valve.

Claims (1)

[Scope of utility model registration request] A cutter having a copy cutter jack is rotatably supported on the shield body, a rotary joint is provided in the center of the cutter, and a power unit installed in the shield body and the copy cutter jack are connected by hydraulic pressure via the rotary joint. In the over-excavation device of a peripheral support type shield excavator connected by piping, a gate valve is provided on the rotor rigid joint side of the pressure oil pipe connecting the rotary joint and the copy cutter jack, and the pressure oil pipe An over-excavation device for a shield excavator, characterized in that a connector is provided closer to a copy cutter than the gate valve in the road.