JPS5923838Y2 - Shield tunneling machine screw conveyor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a screw conveyor for a shield tunneling machine.

A shield excavator is equipped with an earth removal device because it is necessary to discharge the excavated soil to the outside of the machine.

Various types of earth removal devices are used depending on the properties of the excavated earth and sand, but generally a straight shaft screw conveyor capable of continuous earth removal is used.

However, since various devices necessary for the cutter drive system or thrust generation system are installed inside the shield tunneling machine,
It is difficult to secure sufficient space for installing a direct-shaft screw conveyor, and it may not be possible to install it especially with a small-diameter shield tunneling machine.

The present invention was developed in consideration of the above points, and not only can it be installed effectively in a narrow space, but it also has the same soil removal effect as the conventional straight-shaft screw conveyor. The present invention provides a screw conveyor having the following features.

Examples thereof will be described below based on FIGS. 1 to 3.

Reference numeral 1 denotes a partition wall that partitions the inside of the shield machine body 2 into a pressure chamber 4 facing the face ground 3 and an atmospheric pressure chamber 5 behind it.

A bearing 6 is provided on the partition wall 5 , and a rotary shaft 7 supported by the bearing 6 is connected to a cutter head 8 in the pressure chamber 4 and connected to a hydraulic motor 9 in the atmospheric pressure chamber 5 .

10 is a transmission mechanism between the hydraulic motor 9 and the rotating shaft 7.

Therefore, by driving the hydraulic motor 9, the cutter head 8
rotates, the face ground 3 is excavated, and the excavated earth and sand enters the pressure chamber 4.
be taken into.

11 is a screw conveyor provided between the pressure chamber 4 and the atmospheric pressure chamber 5.

The screw conveyor 11 is installed using a narrow space within the shield machine body 2.

That is, two straight screw conveyors 11 A, 1
1 B are connected in directions that intersect with each other.

One of the straight screw conveyors 11A is installed in a space S1 between the transmission mechanism 10 and the shield machine body 2, and its starting end faces the lower part of the pressure chamber 4.

An excavated soil inlet 12 is formed at the starting end of the outer cylinder of this direct screw conveyor 11A.

The other direct shaft screw conveyor 11B is the transmission mechanism 1
0, and its starting end is connected to the terminal end of one of the straight screw conveyors 11A, and its terminal end is located near the upper part of the inner surface of the existing segment 13.

In this respect, for example, if a single straight screw conveyor 11C is to be installed from the lower part of the pressure chamber 4 to the upper part of the inner surface of the existing segment 13 as shown by the imaginary line, the intermediate part will be connected to the transmission mechanism 10. Therefore, it is necessary to reduce the installation space by making the transmission mechanism 10 small.

This is undesirable because it has a serious effect on the excavation performance of the shield tunneling machine.

At the terminal end of the other direct screw conveyor 11B, a cone valve 14 is provided which presses the excavated earth and sand, which are successively transferred, in a direction opposite to the direction of transport with a constant pressure.

15 is a screw shaft drive device.

Reference numeral 16 denotes a carrying-out device, which carries out the excavated earth and sand released and discharged from the earth-discharging port 17 of the screw conveyor 11 into the atmospheric pressure chamber 5 to the outside of the machine.

When the drive device 15 is operated, the excavated soil taken into the pressure chamber 4 enters one of the straight screw conveyors 11A from the input port 12 of the screw conveyor 11, and after being transferred therein, it continues to the other straight screw conveyor 11A. It is transported inside the shaft-type screw conveyor 11B.

At the terminal end of the other direct screw conveyor 11B, the excavated soil that has been sequentially transferred by the pressing force of the cone valve 14 is compacted to form a sand plug there.

By forming the sand plug, the internal pressure of the pressure chamber 4 is maintained at an appropriate level.

When excavated soil is further transferred, the transfer pressure becomes greater than the pressing force of the cone valve 14, so the cone valve 1
4 retreats accordingly due to the differential pressure, and the excavated earth and sand is discharged from the created gap onto the carrying-out device 16, and then carried out of the machine.

Figures 2 and 3 show one straight shaft screw conveyor 11.
It shows the structure of the connection between A and the other straight screw conveyor 11B.

Flanges 19A and 19B are formed at opposite ends of the outer cylinder 18A of one and the outer cylinder 18B of the other, and an arc-shaped connecting pipe 2 is formed between these flanges 19A and 19B.
0 is interposed, and the flanges 21 A, 21 of the connecting pipe 20
B and the flanges 19A and 19B are bolts and nuts 22A.

22 B.

As a result, both the outer cylinders 18A and 18B are smoothly connected to each other at an angle θ (see FIG. 1).

Further, a universal joint 25 is interposed between the opposing end surfaces 24A and 24B of one screw shaft 23A and the other screw shaft 23B.

That is, the universal joint 25 includes one intermediate member 26 and shafts 27A, 27 at opposite ends of this intermediate member 26.
It consists of connecting members 28A, 28B which are pivotally connected via
B is a fitting hole 30 formed in each end surface 24A, 24B.
A and 30B are fitted and fixed.

The shaft 27A. 27B is each screw shaft 23A, 23
They are perpendicular to the axis of B and parallel to each other.

Of course, the universal joint 25 may be of a type other than the one shown.

31 is a flexible protective tube containing a universal joint 25, and its outer diameter is equal to that of each screw shaft 23;
B(7) O"7 is configured to have a smaller outer diameter than the outer diameters of 23a and 23b, and both ends thereof are connected to the respective opposing end surfaces 24A,
It is fixed to the peripheral edge of 24B.

Lubricating oil or grease 32 is inside this protective tube 31.
is filled.

Further, a bearing box 33A is provided at the opposite end of each screw shaft 23A, 23B.

33B to bearings 34A, 34B and earth and sand seals 35A, 3
Support pipes 36A and 36B are fitted onto the outside through the outer cylinders 18A and 18B, and are prevented from swinging.

The support pipes 36A, 36B and the inner peripheral surfaces of the outer cylinders 18A, 18B are connected by flanges 37.38, and both flanges 37.
A cushion material 39 which also serves as a packing material is interposed between the parts 38 and 38.

According to the above, since the screw shafts 23A and 23B are connected to each other via the universal joint 25, the rotational force of the drive device 15 is transmitted to the other screw shaft 2.
3B and is smoothly transmitted to one screw shaft 23A.

The outer cylinders 18A and 18B are smoothly connected to each other through the connecting pipe 20, and the protective tube 31 is connected to the screw shafts 23A and 23B.
Since the outer diameter is smaller than that of the rods 23a and 23b,
A passage area is ensured, and the excavated earth and sand to be transferred can be transferred smoothly at this connection.

In this case, the universal joint 25 itself is also lubricated, which is preferable.

In addition, the cushioning effect of the cushioning material 39 automatically absorbs and aligns the misalignment between the screw shafts 23A and 23B.

In this embodiment, the screw conveyor is bent at the intermediate portion, but the screw conveyor is not limited to this, and may be bent at a plurality of locations.

In this case, provide a universal joint and flexible protective tube at each bend.

Since the present invention can be implemented as described above, not only can the narrow space inside the shield machine be used effectively for installing the screw conveyor, but also the straight shaft screw conveyor can be easily used in terms of earth removal effect. It is possible to obtain the same result compared to a single installation.

In addition, both ends of the flexible protection tube containing the universal joint are fixed to the periphery of the opposing end face of each screw shaft, so the entire universal joint is completely isolated from sand and mud, extending its life. .

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention. Figure 1 is a vertical side view of the shield tunneling machine, Figure 2 is an enlarged vertical side view of the main parts, and Figure 3 is the same as Figure 2. It is an AA arrow view. 11... Screw conveyor, 11 A, 11
B...Direct shaft screw conveyor, 18A,
18B...Outer cylinder, 20...Connecting pipe, 2
3A, 23B...Screw shaft, 24A, 24
B: Opposite end face, 25: Universal joint, 31: Protection tube.

Claims (1)

[Scope of utility model registration request] Bearings that support the ends of the straight screw conveyors opposite the screw shafts of each straight screw conveyor are provided via support pipes on the inner peripheral surfaces of the outer cylinders of the pair of straight screw conveyors arranged in directions that intersect with each other. A shield characterized in that a universal joint is interposed between the opposing end surfaces of each screw shaft, and both ends of a flexible protective tube containing the universal joint are fixed to the peripheral edge of the opposing end surface of each screw shaft. Screw conveyor of excavator.