JPS6222494Y2 - - 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 made in view of the above-mentioned problems, and its purpose is to provide an apparatus that is effective for unloading viscous to gravelly soils, minerals, grains, and the like.

In order to achieve the above object, the present invention provides a hollow spiral screw that surrounds the outside of the casing and is rotatable at the tip of a casing that covers a rotary screw for soil lifting, and a casing that is attached to the tip of the hollow spiral screw. A scraping blade corresponding to the tip of the rotary soil lifting screw protruding from the opening of the soil lifting screw is fixedly provided, and means for driving the soil lifting rotary screw and the hollow spiral screw separately are provided. Even if the soil is sticky and sticky, the hollow spiral screw can push it into the vicinity of the intake port without it sticking to the outside of the casing, and the raking blades scrape the soil near the intake port into the intake port. , it is possible to carry out unloading operations efficiently.

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, in which 1 is a rotary screw for lifting soil, 2 is a casing that covers the rotary screw 1 for lifting soil, and 3 is a screw for removing the casing 2 at the tip of the casing 2. It is a hollow spiral screw that is wound and rotatably provided, and at the tip of the hollow spiral screw 3,
A mounting ring 4 is attached to the casing 2 by being fitted onto the casing 2, and two scraping blades 5, for example, are fixed to the mounting ring 4 in correspondence with the tip portions of the rotary screw 1 for lifting soil protruding from the opening of the casing 2. has been done.
Further, the base end of the hollow spiral screw 3 is fixed by a fixing flange 6 to the other wheel of a bearing 7, one wheel of which is attached to the casing 2 via a mounting flange 8. Reference numeral 9 designates the end bearings of the rotary screw 1 for lifting soil and the scraping blade 5, and 10 represents a drive source for the rotary screw 1 for lifting soil. Reference numeral 11 denotes a drive source installed in the casing 2 to rotationally drive the hollow spiral screw 3, and a pinion 12 attached to the rotating shaft meshes with a rack provided on the outer periphery of the other ring body of the bearing 7. , the hollow spiral screw 3 is forcibly driven to break up and push the earth and sand. 13 is an intake port for earth and sand, and 14 is a discharge port for lifting soil.

In the above configuration, in response to the lifting action by the rotary screw 1 for lifting soil, the hollow spiral screw 3 for pushing crumbs, which is rotationally driven outside the stationary casing 2, is responsible for the bridging effect (arching effect) of the earth and sand around the casing 2. ) together with the dust, the surrounding earth and sand are pressurized by the pushing action of the hollow spiral screw 3 and pushed into the vicinity of the intake port 13 at the tip, making it easier to take in. Therefore, even if it is sticky viscous earth and sand, it will not stick to the outside of the casing 2.
It is pushed into the vicinity of the intake port 13, and the soil near the intake port 13 is scraped up by the scraping blades 5 into the intake port 13, and the unloading action is carried out efficiently.

Note that the drive method, rotation speed, and rotation direction of the earth lifting rotary screw 1 and the hollow spiral screw 3 can be arbitrarily selected independently, and can be selected to suit the material to be lifted.

3 and 4 show another embodiment, in which the casing is divided into an upper fixed casing 2a and a lower rotating casing 2b, and the rotating casing 2b has a hollow spiral screw as in FIG. 3. The mounting ring 4, the scraping blade 5, the fixed flange 6, the bearing 7, and the mounting flange 8 of the hollow spiral screw 3 are attached to the tip of the rotary screw 1 for lifting soil that passes through the fixed casing 2a and the rotating casing 2b. The tip of the raking blade 5 is similarly connected by a tip bearing 9.

15 is a fixed casing 2a and a rotating casing 2
At the boundary portion b, one wheel body is a casing bearing fixed to the fixed casing 2a, and the end of the rotating casing 2b is fixed to the other wheel body. Reference numeral 16 denotes a drive source installed in the fixed casing 2a to rotationally drive the rotating casing 2b, and a pinion 17 attached to the rotating shaft meshes with a rack provided on the outer periphery of the other ring body of the casing bearing 15. , rotate the rotating casing 2b. Further, a drive source 11 for rotationally driving the hollow spiral screw 3 is installed on the fixed casing 2a side, and a pinion 12 attached to its rotating shaft meshes with a rack provided on the outer periphery of the bearing 7.

In this case, the rotations of the hollow spiral screw 3 and the rotating casing 2b are independent of each other, which prevents the adhesion of sticky viscous earth and sand to the outside of the rotating casing 2b, further improving the intake efficiency, and further improving the rotation The relative rotation between the casing 2b and the rotating screw 1 for lifting soil also prevents adhesion on the inner surface of the casing. Note that the drive method, rotation speed, and rotation direction of the earth lifting rotary screw 1, the hollow spiral screw 3, and the rotary casing 2b 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 is described as having a shaft, but it may be a rotary screw for lifting soil without a shaft. In this case, even if coarse solids are present, the cargo can be unloaded without any problem.

As described above, according to the present invention, the rotatable hollow spiral screw that surrounds the outside of the tip of the 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 and the hollow spiral screw can be rotated independently and arbitrarily, the rotation speed and rotation direction can be selected to suit the object to be lifted.

[Brief description of the 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 sectional view showing an embodiment of the present invention, and Figs. FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and an enlarged cross-sectional view of a main part with some parts omitted. 1... Rotating screw for soil lifting, 2... Casing, 3... Hollow spiral screw, 5... Scraping blade, 7... Bearing, 10, 11... Drive source, 1
2...Pinion, 13...Intake port, 2a, 2b...
... fixed and rotating casing, 15 ... casing bearing, 16 ... drive source, 17 ... pinion.

Claims (1)

[Scope of utility model registration request] A rotatable hollow spiral screw that surrounds the outside of the casing is provided at the tip of the casing that covers the rotary screw for soil lifting, and a rotary screw for soil lifting that protrudes from the opening of the casing is provided at the tip of the hollow spiral screw. A soil lifting device, characterized in that scraping blades corresponding to the sections are fixedly provided, and means are provided for driving the soil lifting rotary screw and the hollow spiral screw separately.