JPH0230558Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the earth discharge port of a screw conveyor that discharges earth and sand excavated by the cutter of a shield excavator to the rear. ,
This invention relates to a soil discharge port of a screw conveyor in which screw blades are rotated.

Conventionally, a screw conveyor in which a blade is fixed inside a casing and the blade is rotated together with the casing to convey excavated soil backward has been employed in the shield method. This type of screw conveyor differs from the screw conveyor in which the screw blades inside the casing are rotated by being directly connected to a motor, and the soil discharge port is located at the rear end of the casing. By installing a gate and narrowing the opening of the earth discharge port to provide transport resistance to the earth and sand in the screw conveyor and increasing the degree of filling of earth and sand in the screw conveyor, earth pressure at the face and water pressure can be maintained using the earth pressure. However, since the degree of filling of soil in the screw conveyor cannot be reliably controlled using only the gate method described above, a rotary leaf feeder was installed at the soil discharge port. The degree of filling with earth and sand was increased. However, it was sometimes difficult to install small-diameter shields due to the underground space.

The present invention aims to prevent the collapse of the ground by increasing the degree of filling of earth and sand without using conventional rotary feeders.

Embodiments of the present invention will be described below based on the drawings.

Casing 2 constituting screw conveyor 1
is a fixed type, and the rotary casing 14 is rotatably supported at the rear end of the fixed casing 2, and
A fixed casing 2' is arranged at the rear end of the rotating casing 14, and a part of the screw blades 12 rotatably arranged on the casings 2, 14, 2' is fixed to the inner wall of the rotating casing 14. A ring gear 3 is provided on the outer surface of the rotating casing 14, and a gear 5 is attached to the output shaft of a screw drive motor 4 installed on the fixed casing 2'.
is meshed with the ring gear 3, and the rotating casing 14 is driven through the ring gear 3 by the drive of the motor 4.
rotates to transmit driving power to the screw blades 12. A slide casing 6 is fitted onto the outside of the fixed casing 2' through a sealing material 8 and a bearing 9, and a guide rod is provided to prevent rotation so that the slide casing 6 can only move in the axial direction relative to the fixed casing 2'. At step 7, hold the slide casing 6 on the fixed casing 2',
The slide casing 6 is moved in the axial direction by the telescopic operation of the slide jack 13 disposed between the slide casing 6 and the fixed casing 2', and the position of the earth and sand discharge port can be changed. A gate 10 is attached to the rear end of the vehicle, and the gate 10 can be opened and closed with a gate jack 11. 15 is fixed casing 2'
The space 16 formed at the rear end of is a segment.

With the above configuration, the rear end of the fixed casing 2' has a double pipe structure and a slidable structure, and the space 15 can be formed between the rear end of the casing 2' and the slide casing 6. This space 15 can be made wider by the slide section x of the slide casing 6.

The excavated earth and sand is sent rearward by the screw blades 12 that rotate integrally with the rotation of the rotating casing 14, and then transferred to the fixed casing 2'.
It will be discharged from the rear end. In this invention,
Since the rear end of the fixed casing 2' has a double pipe structure and forms a space 15, earth and sand accumulates in the space 15 and is then discharged when the gate 10 is opened. At this time, slide jack 1
3, when the slide casing 6 is moved rearward to widen the space 15, the conveying force by the screw blade is no longer applied to the space 15, and the earth and sand stays in the space 15. Since the screw conveyor 1 is compacted by the earth and sand that is successively conveyed, the degree of filling of the earth and sand in the screw conveyor 1 is increased. Note that, as the space 15 is made larger, the flow resistance of the earth and sand can be increased and the degree of filling of the earth and sand can be increased.

Therefore, according to the above, the degree of filling of the screw conveyor 1 with earth and sand can be increased by widening the space 15, so that the earth pressure of the earth and sand filling the screw conveyor 1 can improve the water stopping effect. Therefore, it is possible to maintain the face earth pressure and water pressure and prevent the collapse of the ground.

Furthermore, if the transported soil contains clay or the like with strong adhesive strength, the soil adhesion resistance force in the space 15 becomes larger than the conveying force of the screw blades 12,
Since there is a possibility that soil removal may become impossible, in such a case, the space 15 may be narrowed to increase the soil removal efficiency, or the space 15 may be adjusted to an appropriate width depending on the soil properties. good.

It should be noted that the present invention is not limited to the above-mentioned embodiment, but can also be applied to a type of conveyor having a shaft at the center of the screw.

As described above, according to the soil discharge port of the present invention, a slide casing is provided in a double pipe manner at the rear end of the fixed casing of the screw conveyor, and the slide casing is provided with a gate that can be freely opened and closed. The space between the rear end and the gate of the slide casing is widened to allow dirt to accumulate, making it possible to effectively utilize the underground space and at the same time extremely easily increasing the degree of filling of the screw conveyor with dirt. The earth pressure can be used to maintain face earth pressure and water pressure to prevent the collapse of the ground.

[Brief explanation of the drawing]

The figure is a sectional view of the soil discharge port of the screw conveyor in the shield excavator of the present invention. 1... Screw conveyor, 2, 2'... Fixed casing, 3... Ring gear, 4... Screw drive motor, 6... Slide casing, 7
... Guide rod, 10 ... Gate, 13 ... Slide jack, 14 ... Rotating casing, 15
……space.

Claims (1)

[Scope of utility model registration request] A rotating casing is incorporated into a part of the fixed casing of the screw conveyor, the rotating casing and a part of the screw blade are integrally fixed, and a slide casing is provided at the rear end of the fixed casing to form a double pipe. A screw conveyor discharger in a shield excavator, characterized in that a gate that can be freely opened and closed is provided at the rear end of the slide casing, and a drive device that slides the slide casing in the axial direction of the fixed casing. Doguchi.