JP5584242B2 - Decontamination rotary blade - Google Patents

Description

  The present invention relates to a decontamination rotary blade.

If a radioactive substance powder such as radioactive cesium or rain containing it falls in a forest due to an accident at a nuclear power plant, etc., the radioactive substance adheres to and accumulates in soil such as deciduous leaves, twigs, and humus layers. Become.
If rain occurs on this contaminated soil, radioactive substances may flow out to the farmland or residential area at the foot, so decontamination work is performed to remove the contaminated soil.
Such contaminated soil not only removes litter and litter, but also removes it by scraping it to a certain depth from the surface of the soil to obtain a more decontaminating effect.
Therefore, conventionally, decontamination work has been performed by scraping the contaminated soil with a mulberry or a rake (see Patent Document 1).

Japanese Patent Laid-Open No. 2001-22

  However, thin thread-like roots (beard roots) of vegetation are often spread in contaminated soil such as humus layers, and scraping work by cutting off the thin roots with a mulberry or rake, There was a problem that it took a lot of labor and time.

  Then, an object of this invention is to provide the rotary blade for decontamination which can cut off the thin root of the plant in contaminated soil easily, and can raise the contaminated soil.

In order to achieve the above object, the rotary blade for decontamination of the present invention comprises a soil scraping blade piece protruding downward on the lower surface of the flat plate body , and the soil scraping blade piece is substantially in side view. It is an equilateral triangle and has an edge blade along the edge of the blade that comes into contact with the contaminated soil where radioactive substances are attached and accumulated during rotation, and the soil scraping blade piece has the edge of the flat plate body. The blade is formed with a blade edge angle of 15 degrees or more and less than 35 degrees from the lower surface of the part, and the downward projecting dimension of the soil-raising blade piece from the lower surface is set to 20 mm or more and 70 mm or less .
Further, it arranged a plurality of mowing blades pieces to the outer peripheral edge of the circular in plan view of the flat plate main body, and comprising a cutting pieces caused scraped soil downwardly projecting shape on the lower surface of the flat body portion, scraping the soil The raising blade piece has a substantially unequal triangular shape in a side view, and has an edge blade that comes in contact with the contaminated soil on which radioactive material adheres and accumulates along the edge of the edge during rotation. The piece forms the edge of the blade with a blade edge angle of 15 degrees or more and less than 35 degrees from the lower surface of the flat plate main body portion, and sets the downward projecting dimension of the soil-raising blade piece from the lower surface to 20 mm or more and 70 mm or less. It is a thing.

  According to the present invention, it is possible to easily cut the thin roots of the vegetation spreading in the contaminated soil, and to proceed the decontamination work quickly and smoothly. A wide range of contaminated soil can be scraped in a short time by a small number of people, and decontamination work can be performed efficiently.

It is a top view which shows one Embodiment of this invention. It is a side view which shows one Embodiment. It is an AA cross section side view of FIG. It is a top view which shows other embodiment. It is a side view which shows other embodiment. FIG. 5 is a cross-sectional side view taken along the line BB in FIG. 4. It is a principal part bottom view which shows other embodiment. It is a perspective view which shows an example of contaminated soil. It is a principal part cross-section side view which shows an example of a use condition. It is a perspective view which shows an example after completion of decontamination work. It is operation | movement explanatory drawing of embodiment. It is operation | movement explanatory drawing of a comparative example. It is operation | movement explanatory drawing of embodiment. It is an operation explanatory view of a reference example.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
In the rotary blade for decontamination according to the present invention, radioactive materials such as radioactive cesium are scattered due to an accident at a nuclear power plant or the rain containing the radioactive materials falls, and the radioactive materials are soil such as deciduous leaves, twigs, humus layers, etc. In the decontamination work for removing the contaminated soil G as shown in FIG. 8 that adheres and accumulates on the soil, it is used for the soil scraping work to make it easy to collect the contaminated soil G with a scoop or the like. As shown in FIG. 2, the brush cutter body K for weeding work is attached so as to be rotatable around the rotation axis L.

  As in the embodiment shown in FIGS. 1 to 3, a flat plate body 1 made of metal having a rectangular shape in plan view with a mounting hole 11 extending around the rotation axis L, and a lower surface of the flat plate body 1. And a plurality of plate-like soil-raising blade pieces 2 protruding downward from 1b.

The soil scraping blade piece 2 rotates in the contaminated soil G (under the ground) around the rotation axis L (axis L ′ of the mounting hole 11), and has a substantially unequal triangular shape in a side view. Further, it has an inclined blade edge 21 that contacts the contaminated soil G first while being rotated in the rotation direction N (disposed on the leading side in the rotation direction). The blade edge angle θ between the blade edge 21 and the lower surface 1b is set to less than 45 degrees , specifically , 15 degrees to less than 35 degrees.

Further, the blade portion 20 of the soil scraping blade piece 2 is a single blade type in which a radially inner side surface 22 (of the rotation axis L) is formed on the edge blade along the blade edge 21.
The blade portion 20 may be a double-blade type in which both side surfaces 22 and 23 side (the radially inner side surface 22 side and the radially outer side surface 23 side) are formed as edge blades along the blade edge 21.

  Further, the soil scraping blade pieces 2 are arranged on the outer edge 1 e of the flat plate main body 1, and four around the rotation axis L are arranged at equal intervals. Two may be provided at intervals of 180 degrees. Moreover, the downward projecting dimension H from the upper end in contact with the flat plate main body 1 to the lower end 2b is set to 20 mm or more and 70 mm or less. Further, in a plan view (bottom view), it is formed in a single letter shape in the tangential direction of a virtual circle with the rotation axis L as the center point.

  In addition, a single metal plate is formed in a cross shape in plan view, and the four tip portions of the cross are folded downward while the central portion is held flat, and the bent tip portion is soiled. The blade piece 2 is the flat plate main body 1 at the center that is not bent. The flat plate main body 1 and the soil-raising blade piece 2 are made of a single metal plate, and can be easily manufactured without requiring welding and assembly, and are suitable for mass production. The flat plate main body 1 and the soil scraping blade piece 2 may be integrally formed by being fixed by welding after the creation.

Next, another embodiment will be described.
As shown in FIGS. 4 to 7, a metal flat plate body portion 1 having a circular shape in plan view with a mounting hole 11 penetrating in the center, and a plurality of protrusions formed downwardly projecting from the lower surface 1 b of the plate body portion 1. Metal plate-like soil-raising blade piece 2 and a plurality of plate-like grass cutting blade pieces 3 projecting radially outward from the outer peripheral edge portion 1d of the flat plate main body portion 1 to the flat plate main body portion 1 (rotation axis L). And.

The soil-raising blade piece 2 has a substantially unequal triangular shape in a side view, and has an inclined blade edge 21 that comes into contact with the contaminated soil G during rotation in the rotation direction N. The blade edge angle θ between the blade edge 21 and the lower surface 1b is set to less than 45 degrees , specifically , 15 degrees or more and less than 35 degrees.

  Further, the blade portion 20 of the soil scraping blade piece 2 is a double-blade type in which both side surfaces 22 and 23 side are formed as edge blades along the blade edge 21. Note that the blade portion 20 may be a single blade type in which only the radially inner side surface 22 side is formed as an edge blade along the blade edge 21.

  Further, the soil scraping blade pieces 2 are disposed near the outer peripheral edge 1d of the flat plate main body 1, and a pair (two) are disposed around the rotation axis L at intervals of approximately 180 degrees (170 to 190 degrees). ing. And it is affixed integrally to the flat plate body 1 by welding or the like. In addition, four around the rotation axis L may be provided at equal intervals. Moreover, the downward projecting dimension H from the upper end in contact with the flat plate main body 1 to the lower end 2b is set to 20 mm or more and 70 mm or less. Further, in a plan view (bottom view), it is formed in a single letter shape in the tangential direction of a virtual circle with the rotation axis L as the center point.

Next, one embodiment of the decontamination rotary blade of the present invention and a method of use (action) of another embodiment will be described.
As shown in FIG. 8, in the forest, there is contaminated soil G such as a humus layer in which radioactive materials such as radioactive cesium have fallen due to an accident at a nuclear power plant and the radioactive materials have adhered and accumulated. This is used for decontamination work by scraping and removing the contaminated soil G.

  As shown in FIG. 9, the ground surface of the contaminated soil G is attached to a mower body K for rotary weeding having a rotating shaft J that is rotationally driven by a motor E such as a motor or an engine. On the other hand, the flat plate body 1 is driven to rotate while being held parallel or slightly inclined. Then, it moves forward while swinging (operating).

Further, the soil scraping blade piece 2 is disposed in the ground. It arrange | positions so that the one part thru | or the whole (more than half of the blade edge 21) from the lower end 2b of the soil-raising blade piece 2 to the upper end (the lower surface 1b of the flat plate body 1) may be in the ground of the contaminated soil G.
Then, the plurality of soil scraping blade pieces 2 are rotated around the rotation axis L in the contaminated soil G (underground) to scrape the contaminated soil G.

The soil scraping blade piece 2 agitates and soils the contaminated soil G having a predetermined depth from the ground surface.
There are many contaminated soils G to be removed from the ground surface to a predetermined (constant) depth, and soils deeper than that are not contaminated or have a low contamination level and need not be removed. That is, it is possible to reduce the labor for removing (carrying out) soil having low (no) decontamination effect without stirring the soil that does not need to be removed, and to perform the decontamination work efficiently. In addition, compared to a rake or the like, unevenness in the depth of scratching by each worker can be prevented, and work can be made uniform. In addition, if the downward protrusion dimension H is less than 20 mm, the contaminated soil G to be sufficiently removed cannot be stirred, and if it exceeds 70 mm, the resistance to rotate in the contaminated soil G (underground) increases. A large prime mover E and a brush cutter main body K are required, and the operation of the decontamination operator becomes difficult.

In addition, thin thread-like roots (whisker roots) Q of plants and the like may spread in the contaminated soil G such as the humus layer. The thin roots Q and the like are scraped and the blade piece 2 is cut (cut).
As shown in FIG. 11, the soil scraping blade piece 2 cuts a thin root Q or the like with a cutting force Fa perpendicular to the blade edge 21. At this time, the cutting reaction force Fd is received. The component force of the cutting reaction force Fd is defined as a counter-rotational reaction force Fe and an upward reaction force Fi.
For example, as shown in FIG. 12, the soil scraping blade piece 2 ′ of the comparative example in which the blade edge angle θ ′ is 45 ° or more has the same cutting force Fa ′ at the time of cutting as in FIG. The reaction force Fe ′ is larger than the counter-rotation direction reaction force Fe in FIG. 11, and the upward reaction force Fi ′ is smaller than the upward reaction force Fi in FIG.
That is, the soil-raising blade piece 2 of the embodiment (FIG. 11) can obtain an effect of releasing a large amount of reaction force in the upward direction and reducing the reaction force in the counter-rotation direction. Therefore, there is little possibility that the rotary blade for decontamination stops suddenly due to overload, and if the output (torque) of the motor E is the same, the reaction force resisting the rotational force is small, and the thin root Q is easily cut. it can.
If the blade edge angle θ is less than 15 degrees, it is difficult to sufficiently (deeply) stir the ground unless the soil scraping blade piece 2 is formed large and the usability is poor. Therefore, the blade edge angle θ is 15 degrees or more. to set in. Moreover, it can set to less than 35 degree | times and can make the reaction force to a counterrotation direction smaller.

  Further, since the soil-raising blade piece 2 is formed in a single letter shape in plan view, the rotation locus of the intermediate portion is more radial than the rotation locus of the tip portion of the soil-raising blade piece 2 as shown in FIG. As shown in FIG. 14, the contaminated soil G and the contact area S during rotation are wider than the contact area S ′ in the case of the soil scraping blade piece 2 ″ of the reference example having a circular arc shape in plan view. (growing. That is, by forming a single letter shape in plan view, it is possible to cause more contaminated soil G and to cut a large number of roots. Further, as shown by the arrow W shown in FIG. 13, the contaminated soil G is blown radially inward and can be stirred more efficiently.

  The soil scraping blade piece 2 softens the contaminated soil G, and it is easy to collect litter and litter with a rake or the like, and is improved to a soil where a scoop or the like is easy to insert, and is easily and quickly scraped off. When the contaminated soil G is cut away, as shown in FIG. 10, the contaminated leaves, weeds, humus layers, and the like disappear in the forest, and the decontamination work ends.

  In addition, in the case of the embodiment shown in FIG. 4 to FIG. 7, in addition to the above-described action, it has a plurality of grass cutting blade pieces 3 and grows on the contaminated soil G (projects from the ground surface). Weeds and thin trees can be cut, and mowing and soil scraping work are performed at the same time, shortening the work time of the entire decontamination work and improving work efficiency.

  The design of the present invention can be changed, and in the embodiment shown in FIGS. 1 to 3, the shape of the flat plate body 1 in plan view can be any shape such as a triangle, a polygon, or a circle. Further, the number of soil scraping blade pieces 2 is not limited to the illustrated embodiment, and may be two, three, or five or more. The shape and the number of the grass cutting blade pieces 3 are not limited to the illustrated embodiment, and are free. Moreover, the structure of the blade part of the grass cutting blade piece 3 is free, such as a brazed cemented carbide chip or a burned artificial diamond. The brush cutter main body K is not limited to the shape and structure shown in FIG. 8 as long as it has a rotating shaft J that can be rotated by a prime mover E such as an engine or a motor and to which a decontamination rotary blade can be attached. Although it is free to have a support wheel or a four-wheeled vehicle, it is desirable to use a small and lightweight one that can be easily brought into the forest.

As described above, the decontamination rotary blade of the present invention has the soil scraping blade piece 2 projecting downward on the lower surface 1b of the flat plate body 1 so that the thin root Q of the vegetation spreading in the contaminated soil G is obtained. The decontamination work can be proceeded quickly and smoothly. A wide range of contaminated soil G can be scraped by a small number of people in a short time, and decontamination work can be performed efficiently. In addition, even in large forests where it is difficult for large machines or vehicles to enter, the brush cutter body K for weeding work, which can be easily carried in and out, can be used to scrape contaminated soil G, and various types of removal It can correspond to the dyeing target area. The contaminated soil G can be scraped off from the ground surface to a predetermined depth (uniform shape ) .

  A plurality of grass cutting blade pieces 3 are disposed on the outer peripheral edge 1d of the flat plate main body 1 having a circular shape in plan view, and the soil scraping blade 2 is provided on the lower surface 1b of the flat plate main body 1 so as to protrude downward. Therefore, the thin roots Q of the vegetation spreading in the contaminated soil G can be easily cut into fine pieces, and the decontamination work can be proceeded quickly and smoothly. A wide range of contaminated soil G can be scraped by a small number of people in a short time, and decontamination work can be performed efficiently. The contaminated soil G can be scraped off from the ground surface to a predetermined depth (uniform shape). Moreover, the soil scraping work and the weeding work can be performed simultaneously, and the time of the entire decontamination work can be shortened. Alternatively, the number of personnel can be reduced.

  Further, the soil-raising blade piece 2 has a substantially unequal triangular shape in a side view, and the blade edge 21 that comes into contact with the contaminated soil G during rotation is less than 45 degrees from the lower surface 1b of the flat plate body 1. Since it is formed with the angle θ, it is possible to easily cut the thin root Q and prevent sudden stop due to overload. Even with the prime mover E with a small output (torque) that can be easily carried, the thin roots can be cut reliably.

DESCRIPTION OF SYMBOLS 1 Flat body part 1b Lower surface 1d Outer peripheral edge part 2 Soil-raising blade piece 3 Mowing blade piece
21 Cutting edge G Contaminated soil
H Downward protruding dimension θ Blade angle

Claims (2)

The lower surface (1b) of the flat plate body (1) is provided with a soil scraping blade piece (2) protruding downward ,
The soil scraping blade piece (2) has a substantially unequal triangular shape in a side view, and is along the cutting edge (21) that comes into contact with the contaminated soil (G) to which radioactive substances have adhered and accumulated first during rotation. Have an edge blade,
The soil scraping blade piece (2) forms the blade edge (21) with a blade edge angle (θ) of 15 degrees or more and less than 35 degrees from the lower surface (1b) of the flat plate body (1), and A rotary blade for decontamination characterized in that a downward projecting dimension (H) of the soil scraping blade piece (2) from the lower surface (1b) is set to 20 mm or more and 70 mm or less . A plurality of mowing blade pieces (3) are disposed on the outer peripheral edge (1d) of the flat plate body (1) having a circular shape in plan view, and projecting downward from the lower surface (1b) of the flat plate body (1). With a soil scraping blade (2) ,
The soil scraping blade piece (2) has a substantially unequal triangular shape in a side view, and is along the cutting edge (21) that comes into contact with the contaminated soil (G) to which radioactive substances have adhered and accumulated first during rotation. Have an edge blade,
The soil scraping blade piece (2) forms the blade edge (21) with a blade edge angle (θ) of 15 degrees or more and less than 35 degrees from the lower surface (1b) of the flat plate body (1), and A rotary blade for decontamination characterized in that a downward projecting dimension (H) of the soil scraping blade piece (2) from the lower surface (1b) is set to 20 mm or more and 70 mm or less .

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