JPS6222495Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an earth lifting device for lifting variable granular material such as excavated earth and sand or sticky earth material to be lifted almost vertically.

Conventionally, when unloading sticky clay soil or sand and gravel mixed with coarse solids, there have been problems such as adhesion to the casing covering the rotary screw for lifting soil and difficulty in getting it into the rotary screw for lifting soil. It was occurring.

The present invention was devised in view of the above-mentioned problems, and its purpose is to provide an apparatus that is effective for unloading from clay soil to gravelly soil, minerals, grains, and the like.

In order to achieve the above object, the present invention divides the casing covering the rotating screw for soil lifting into an upper fixed casing and a lower rotating casing, and a rotatable hollow spiral screw surrounding the outer side of the rotating casing. and a raking blade corresponding to a tip portion of a rotary screw for soil lifting protruding from an opening of the rotary casing is fixedly provided at the tip of the rotary casing, and the rotary screw for lifting soil, the rotary casing, and the hollow spiral screw are connected to each other. It has a structure in which means are provided to drive each separately.
Even if the soil is sticky and sticky, the hollow spiral screw allows it to be pushed into the vicinity of the intake port without it sticking to the outside of the casing. This allows for efficient lifting of cargo.

An embodiment of the present invention will be described below based on the drawings. Figure 1 shows an example of a shield tunnel excavation and earth lifting system equipped with the device of the present invention. In FIG. 1, a screw earth lifting device C is installed so that earth and sand excavated by a shield excavator A is put into a pit B at the bottom of the shaft, and the earth is lifted from the pit B along the shaft,
The lifted earth and sand are discharged by a conveyor D.

FIG. 2 shows details of the screw lifting device C, and FIG. 3 is an enlarged view of its main parts. Reference numeral 1 denotes a rotary screw for lifting soil, and the casing covering the rotary screw for lifting soil 1 is divided into an upper fixed casing 2a and a lower rotating casing 2b. A blade 3 is fixed to correspond to the tip portion of the rotary screw 1 for lifting soil that protrudes from the opening of the rotary casing 2b. Reference numeral 4 designates the tip bearings of the rotary screw 1 for soil lifting and the scraping blade 3. Reference numeral 5 denotes a hollow spiral screw provided rotatably around the rotating casing 2b, the base end of which is
One wheel body is connected to the rotating casing 2 by the flange 6.
It is fixed via a mounting flange 8 to the other ring body of the bearing 7 mounted on the bearing 7b. Reference numeral 10 denotes a drive source installed in the fixed casing 2a to rotate the hollow spiral screw 5 relative to the rotating casing 2b. The hollow spiral screw 5 is engaged with the rack provided in the screw 5, and the hollow spiral screw 5 is forcibly driven to break up and push the earth and sand.

12 is a fixed casing 2a and a rotating casing 2
At the boundary with b, one wheel body is a casing bearing attached to the fixed casing 2a by a fixed flange 13 (Fig. 3), and the other wheel body is a casing bearing attached to the rotating casing 2b.
4 is fixed. 15 is the rotating casing 2b
A drive source installed on the fixed casing 2a to rotationally drive the rotating casing 2b. It is rotated relative to the rotary screw 1 for lifting earth and the hollow spiral screw 5. 17 is an intake port for earth and sand, and 18 is a discharge port for lifting soil.

In the above configuration, the hollow helical screw 5 for pushing crumbs, which is rotated relative to the lifting action by the rotary screw 1 for lifting soil, is rotated outside the rotary casing 2b, and the hollow helical screw 5 for pushing crumbs adheres to the rotary casing 2b and tries to follow it. In addition to breaking down the soil of
The pushing action of the hollow spiral screw 5 pressurizes the surrounding earth and sand and forces it into the vicinity of the intake port 17 at the tip, making it easier to take in. Therefore, even if it is sticky viscous earth and sand, it is pushed into the vicinity of the intake port 17 without adhering to the outside of the rotating casing 2b, and is pushed into the vicinity of the intake port 17 by the scraping blade 3 rotating together with the rotating casing 2b. Sediment from intake port 17
The unloading action is carried out efficiently. At the same time, due to the relative rotation between the soil lifting rotary screw 1 and the rotary casing 2b, the rotary casing 2
b It also prevents dirt from adhering to the inner surface.

Note that the driving method, rotation speed, and rotation direction of the earth lifting rotary screw 1, the rotary casing 2b, and the hollow spiral screw 5 can be independently selected arbitrarily, and can be selected to suit the earth to be lifted.

Further, in this embodiment, the rotary screw for lifting soil may be a rotary screw for lifting soil with a shaft, which has been described as having no shaft. However, this case is disadvantageous when coarse solids are present.

As described above, according to the present invention, the rotatable hollow spiral screw that surrounds the outer side of the lower rotating casing that covers the rotary screw for lifting soil can break up the soil to be lifted and push it into the vicinity of the intake port, causing it to stick. Even soils to be lifted can be easily disposed of without adhering to the casing. In addition, the scraping blades can improve the efficiency of taking in soil to be lifted near the intake port.
Furthermore, since the earth lifting rotary screw, the rotary casing, and the hollow spiral screw can be rotated independently and arbitrarily, the rotation speed and rotation direction can be selected to suit the material to be lifted.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of a shield tunnel excavation and earth lifting system equipped with the device of the present invention, Fig. 2 is a cross-sectional view showing an embodiment of the present invention, and Fig. 3 is an enlarged cross-section of the main part with some parts omitted. It is a diagram. 1... Rotating screw for soil lifting, 2a... Fixed casing, 2b... Rotating casing, 3... Scraping blade, 5... Hollow spiral screw, 7...
Bearing, 10... Drive source, 11... Pinion, 12
...Casing bearing, 15... Drive source, 16...
Pinion, 17...Intake port.

Claims (1)

[Scope of utility model registration request] The casing covering the rotary screw for soil lifting is divided into an upper fixed casing and a lower rotary casing, a rotatable hollow spiral screw is provided surrounding the outside of the rotary casing, and an opening of the rotary casing is provided at the tip of the rotary casing. A scraping blade corresponding to the tip of the rotary soil lifting screw protruding from the section is fixedly provided, and means for driving the rotary soil lifting screw, the rotary casing, and the hollow spiral screw separately is provided. Characteristic soil lifting equipment.