KR102079713B1 - A hybrid apparatus for generating wind power and sola power established to arable land - Google Patents

Abstract

Disclosed is a hybrid wind and solar power generator for a farmland, which comprises: a base block fixedly installed on the ground; an azimuth angle rotation guide block assembled and connected to an upper portion of the base block, and having a guide rail coupled with a chain at the outside thereof; a turntable block installed on an upper portion of a guide rail block to be supported on a guide roller installed on an upper portion of the azimuth angle rotation guide block; a tilter block slantly installed at an upper portion of the turntable lock to have different left and right heights; an array block rotatably installed on an upper portion of the tilter block, and having a solar cell panel installed on an upper portion thereof; an elevation angle adjusting actuator installed between the tilter block and the array block to adjust an elevation angle of the array block; and a wind power generator fixedly installed on a central upper portion of the base block, and installed in the center to support rotation of the turntable block.

Description

Wind and solar hybrid power plant for arable land {A HYBRID APPARATUS FOR GENERATING WIND POWER AND SOLA POWER ESTABLISHED TO ARABLE LAND}

The present invention relates to a wind farm and a hybrid solar power plant for arable land, and more particularly, it is installed on the arable land and can produce energy through wind power and solar power without affecting the growth of arable land. An optical hybrid generator.

In general, photovoltaic power generation and wind power generation, unlike other energy sources, are pollution-free energy sources that can obtain energy without causing greenhouse gas emissions or environmental destruction factors, and their importance and necessity are gradually increasing.

Among these, solar power means converting sunlight directly into electric power by solar cells, and the incident angle of solar light incident on the solar panel is directly related to power generation efficiency. Even if the sun's altitude and orientation change often, the solar panels need to move according to the sun's altitude and orientation.

In view of this point, a tracking device, that is, a solar tracking device, which allows the solar panel to change the posture by following the position of the sun, has been variously developed.

For example, in Korean Patent No. 10-1346684, three solar cell blocks are disposed on a first frame, and a solar cell block uses sunlight by using first and second high-altitude operation units and actuators formed of actuators. The configuration for tracking is described.

However, according to the related art, the play support lever for synchronizing and manipulating a plurality of solar cell blocks is so severe that shaking occurs in strong winds and the like, thereby deteriorating stability.

In addition, there is a problem in that a large load is generated in the second high-altitude operation unit for adjusting the angle of the first frame for supporting the solar cell block, thereby increasing the capacity of the driving motor and the like, thereby increasing the cost.

In addition, in order to synchronize a plurality of solar cell blocks, a plurality of components and an interlocking device are required, which increases the number of parts and increases weight, thereby decreasing stability and increasing costs.

In addition, in the case of the photovoltaic device, structures must be installed in various places. Until now, the components have been brought into the installation place for each part, and the skilled workers at the installation place have to install them through on-site assembly work. This takes a long time, excessive labor costs, and the problem is that occupy more than 20% of the total facility costs.

In particular, since skilled professionals must assemble and install parts, labor costs are increased, and when a non-skilled person installs, the reliability of the installed structure is lowered due to a problem such as misassembly. .

On the other hand, in the case of the wind power generator is installed to install a rotary blade of the pole upright installed on the ground, it is configured to produce electrical energy by using the rotational force of the rotating blade.

However, in the related art, since the solar power generation device and the wind power generation device are separately installed as described above to produce energy, a lot of cost and space constraints for installing each power generation device follow.

In particular, in recent years, since a large installation area is required in the case of a solar power generation device, there is a restriction in the installation place, and in the case of a wind power generation device, there are many restrictions depending on the installation place.

The present invention was conceived in view of the above, and improved arable land so that the solar power plant and the wind power plant can be easily assembled and installed in a single structure on the site with minimal effect on the cultivated area of the arable land. The purpose is to provide a hybrid wind and solar power generation device.

Hybrid wind and photovoltaic device for arable land of the present invention for achieving the above object, the base block is fixed on the ground; An azimuth rotation guide block assembled and connected to an upper portion of the foundation block and having a guide rail coupled to an outer chain; A turntable block installed on an upper portion of the azimuth rotation guide block to be supported by a guide roller installed on the upper portion of the azimuth rotation guide block; A tilter block installed on an upper side of the turntable block to be inclined differently in height; An array block rotatably installed on an upper portion of the tilter block and a solar cell panel installed on an upper portion of the tilter block; An altitude angle actuator installed between the tilter block and the array block to adjust an altitude angle of the array block; It is fixed to the center of the base block, the wind generator is installed in the center to support the rotation of the turntable block; characterized in that it comprises a.

As a result, it is possible to provide a hybrid wind and photovoltaic facilities that can simultaneously perform wind and photovoltaic power generation so as not to interfere with farming work on arable land.

Here, the base block, a cylindrical concrete tube made of concrete; Corrugated pipe is installed on the inner circumference of the concrete pipe; A plurality of coupling pads installed at upper and lower ends of the concrete pipe; And a reinforcing steel pipe coupled to the upper and lower coupling pads and installed in the concrete pipe.

As a result, the foundation block can be firmly installed on the ground, can be manufactured in advance and easily installed in the field, can be installed by increasing the height by connecting a plurality.

The azimuth rotation guide block may further include: a base pad coupled to an upper end of the base block; A block pillar installed at an upper center of the base pad; A wind turbine coupling pad coupled to the upper portion of the block pillar; Ring guide rails; A rail arm connecting the guide rail and the block pillar; And a chain installed on an outer circumference of the guide rail.

The turntable block may further include a turntable frame; A tilt supporter installed to protrude upward from both sides of the upper part of the turntable frame; An azimuth drive motor installed on the front of the turntable frame and interlocked with the chain; And a support roller installed at a lower portion of the turntable frame and supported at an upper portion of the azimuth rotation guide block.

In addition, the tilter block, one side is connected to the tilter support, the other side is connected to the turntable frame, the tilter block frame having a frame shape; An array rotation shaft support protruding to the upper portion of the tilter block frame; And a plurality of actuator support brackets spaced apart from the tilter block frame.

The array block may include a lower array block installed on the tilter block and installed at a relatively low position, and an upper array block installed at a relatively high position, and each of the lower and upper array blocks may have a girder. ; An array shaggy installed on an upper portion of the girder and having a solar cell panel installed on the upper side of the girder; And an array driving shaft installed under the girder and connected to the array rotating shaft support.

In addition, the wind power generator, a lower end of the wind turbine is installed perpendicular to the center of the azimuth rotation guide block, and serves as a central axis of rotation of the turntable block; A rotary blade unit rotatably installed on an upper portion of the wind turbine; And a generator installed at the wind turbine to produce electrical energy from the rotational force of the rotary blade unit.

This makes it easy to install by assembling and assembling each part in the field, and install a wind power generator on the upper part of the foundation block to install a hybrid power generation unit capable of both wind and solar power generation on farmland without disturbing farming work. Can be.

According to the hybrid wind and photovoltaic device for arable land of the present invention, it is possible to install a wind power and a photovoltaic power generation device at a height that does not interfere with farming on the arable land.

Particularly, by blocking the parts that make up the entire system by parts, each block can be standardized at the factory and then installed by the operator in the field after installation, thereby shortening the structure installation work time, thereby significantly reducing costs. Can be reduced.

In addition, since each block only need to be assembled in order according to the assembly order manual provided, there is an advantage that even non-skilled person can be easily assembled.

In addition, each blocked portion can be separated and replaced for each portion in case of failure or damage, thereby facilitating maintenance.

1 is a front view showing a hybrid wind and photovoltaic device for arable land according to an embodiment of the present invention.
FIG. 2 is a view illustrating a state in which only the azimuth rotation guide block and the wind power generator are installed on the basic block in FIG. 1.
3 is a cross-sectional view illustrating the basic block of FIG. 1.
4 is a bottom view of FIG. 3.
5 is a perspective view for explaining the coupling pad and the reinforcing steel pipe of FIG.
FIG. 6 is an enlarged view of portion A of FIG. 1 to explain a state in which a plurality of basic blocks are stacked and connected by using a coupling pad.
7 is a plan view of the azimuth rotation guide block of FIG.
8 is a cross-sectional view of the azimuth rotation guide block of FIG.
9 is a schematic plan view of the turntable block of FIG. 1.
FIG. 10 is a side view of the turntable block shown in FIG. 9.
FIG. 11 is a front view of the turntable block shown in FIG. 9.
12 is a plan view illustrating a coupling state of the azimuth rotation guide block and the turntable block of FIG. 1.
FIG. 13 is a front view illustrating the state of FIG. 12. FIG.
FIG. 14 is a front view illustrating the tilter block of FIG. 1.
FIG. 15 is a plan view of the tilter block of FIG. 14.
FIG. 16 is a right side view of the tilter block of FIG. 14.
17 and 18 are front views illustrating a coupling state of the azimuth rotation guide block, the turntable block, the tilter block, and the ear block of FIG. 1.
19 illustrates the lower array block of FIG. 1.
20 is a diagram illustrating the upper array block of FIG. 1.
21 is a view showing an extract of the wind generator of FIG.

Hereinafter, a hybrid wind and photovoltaic device for arable land according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, the hybrid wind and solar power generation device 10 for arable land in accordance with an embodiment of the present invention, the foundation block 100 is fixed to the support surface, the upper portion of the foundation block 100 Is coupled to the azimuth rotation guide block 200 is coupled, the turntable block 300 is coupled to the upper portion of the azimuth rotation guide block 200, the tilter block 400 is coupled to the turntable block 300, the tilter block 400 An array block 500, a solar cell panel 600 installed on the array block 500, and a wind generator 700 installed at an upper center of the azimuth rotation guide block 200.

Referring to Figures 2 and 3, the foundation block 100 is to be placed and fixed in concrete in a state inserted into a predetermined depth from the ground. The foundation block 100 is a cylindrical concrete pipe 110 made of concrete, corrugated pipe 120 is installed on the inner circumference of the concrete pipe 110, and a plurality of installed on each of the top and bottom of the concrete pipe 110 The coupling pad 130 and the upper and lower coupling pads 130 are connected to each other and are provided with a reinforcing steel tube 140 installed in the concrete pipe 110.

That is, a plurality of reinforcing steel pipe 140 is disposed on the outside of the corrugated pipe 120, the coupling pad 130 is coupled to the upper and lower ends of the reinforcing steel pipe 140 by welding or the like. And reinforcing steel pipe 140 is poured in concrete to form a concrete pipe (110). Idae, reinforcing steel pipe 140 is preferably arranged at regular intervals of eight.

As shown in FIG. 5, the coupling pad 130 may include an upper plate 131 and a lower plate 132, and a side plate 133 that connects the upper plate 131 and the lower plate 132. May have an open structure. And the reinforcing iron pipe 140 is connected to one of the upper plate 131 and the lower plate 132, the fastening hole (h1) for fastening the bolt is formed on the opposite side.

According to the above configuration, the foundation block 100 should be installed at approximately 3m or more from the ground so that the solar panel 600 can be installed so as not to interfere with farming work in the arable land, but the 3m pillar is difficult to carry and install. . Therefore, after manufacturing the basic block 100 to a length of approximately 1.5m, it can be installed by assembling a plurality of up and down. Therefore, as shown in Figures 1 and 6, the other base block 100 is placed on the top of the base block 100, the coupling pads 130 engaged with each other by fastening with bolts and nuts to install firmly coupled Can be. That is, the base block 100 may be divided into a lower block 100 ′ and an upper block 100 ″, and may be installed by stacking up and down.

The foundation block 100 of this configuration digs the ground to a depth of about 1m and gravel about 0.2m. After coupling the anchor pad or anchor bolt to the coupling pad 130 at the bottom of the lower block 100 ′, the concrete may be filled in about 0.1 mm on the gravel and buried to be stably installed on the ground.

1, 7 and 8, the azimuth rotation guide block 200 is fixedly coupled to an upper portion of the foundation block 100 in a blocked state. The azimuth rotation guide block 200 is the base pad 210 is coupled to the upper end of the base block 100, the block pillar 220 is installed in the upper center of the base pad 210 and the block pillar 200 A wind pillar coupling pad 230 coupled to the upper portion, a ring-shaped guide rail 240, and a rail arm 250 connecting the guide rail 240 and the block pillar 220 are provided.

A plurality of coupling holes 211 are perforated in the base pad 210 to be bolted to the coupling pad 130 of the base block 100. Therefore, when the coupling pad 130 is coupled and tightened with a nut through a coupling hole h1 and the bolt that protrudes upward through the coupling hole 211, the azimuth rotation guide block 200 is easily mounted on the foundation block 100. Can be assembled and combined. The block pillar 220 is connected to the center of the base pad 210 so as to stand up to a predetermined height. Block pillar 220 is a cylindrical shape, the upper end is open is coupled to the lower end of the wind turbine 710 to be described later. On the upper end of the block pillar 220, a wind pole coupling pad 230 to which the wind turbine base pad 710 installed at the bottom of the wind pole 710 is coupled is formed in a disk shape. A plurality of coupling holes are formed in the wind pole coupling pad 230.

The guide rail 240 has a circular ring structure and is connected to each of the base pad 210, the wind pillar coupling pad 230, and the block pillar 220 by the plurality of rail arms 250. The outer periphery of the guide rail 240 may be installed along the outer circumference of the chain 260 to a predetermined length.

9 to 13, the turntable block 300 is coupled to the upper portion of the azimuth rotation guide block 200 by the wind pole 710 and the dry bearing 301 to rotate around the wind pole 710. Possibly assembled. The turntable block 300 includes a turntable frame 310, a tilt supporter 320 installed at both sides of the upper part of the turntable frame 310, and an azimuth driving motor installed at the front of the turntable frame 310. 330.

The turntable frame 310 may have a structure in which a pair of outer frames 311 and a plurality of cabinet frames 312 connecting the outer frames 311 are connected. At the center of the inner cabinet frame 313, a dry bearing 301 coupled to the wind pole 710 is installed. The wind pole 710 is coupled to the dry bearing 301 to support the turntable block 300 to be rotatable about the wind pole 710.

In addition, the tilt supporter 320 is installed at both sides of the front upper portion of the turntable frame 310 to protrude to a predetermined height.

The azimuth drive motor 330 is installed on the front of the turntable frame 310, and has a sprocket 331 connected to the chain 260 installed on the guide rail 240. As the azimuth driving motor 330 is driven, the sprocket 331 is interlocked with the chain 260 to adjust the azimuth by rotating the turntable block 300 on the azimuth rotation guide block 200.

In addition, a plurality of guide rollers 340 are installed between the turntable frame 310 and the azimuth rotation guide block 200. Therefore, the turntable block 300 may be stably rotated on the guide rail 200 to adjust the azimuth angle.

14 to 17, the tilter block 400 is assembled and installed on the upper portion of the turntable block 300, and both sides are connected and assembled to the tilter support 320 of the turntable block 300. Assembled in the turntable frame 310 is connected and supported. That is, the tilter block 400 is assembled on the turntable block 300 at a predetermined angle, preferably at an angle of 20 degrees.

The tilter block 400 includes a tilting block frame 410 having a quadrangular frame shape, an array rotation shaft support 420 installed on the tilter block frame 410, and an actuator support bracket installed on the tilter block frame 410. 430. Four array rotating shaft supports 420 are fixedly installed to protrude upward from both sides of the tilter block frame 410. Two actuator support brackets 430 are fixedly spaced apart from each other at approximately an intermediate position of the tilter block frame 410.

14 and 15, the array block 500 is installed on the tilter block 400, and the lower array block 510 is installed at a relatively low position, and the upper array block is installed at a relatively high position. 520.

Each of the array blocks 510 and 520 includes girders 511 and 521, array sputum 512 and 522 installed on the girders 511 and 521, and array drive shafts 513 and 523.

Array drive shafts 513 and 523 are connected to each of the array girders 511 and 521, and a plurality of array limestones 512 and 522 on which the solar panel 600 is supported are provided on the array girders 511 and 521.

The array drive shafts 513 and 523 are installed below the array girders 511 and 512, and pivotally connected to an upper end of the array support 420.

The lower and upper array blocks 510 and 520 having the above configuration are transported to the site in a blocked state, assembled and installed in the tilter block 400, and rotated by the altitude adjustment actuator 530 to adjust the altitude angle. . To this end, actuator support brackets 514 and 524 are respectively installed in the array stone racks 512 and 522.

The altitude angle adjustment actuator 530 is an actuator body 531, a drive chain 532 is installed to be driven from one end of the actuator body 531 to the other end, and a drive motor for driving the drive chain 532 driving ( 533 and the lower connection bracket 534 which is installed at the lower end of the actuator body 531 and rotatably connected to the actuator support bracket 430 of the tilter block 400, is coupled to the drive chain 532 and is A mobile connection bracket 535 is rotatably connected to the actuator support brackets 514 and 524 installed in the array shaver 512 and 522. According to the above configuration, the drive chain 532 runs in the forward or reverse direction when the drive motor 533 is driven in the forward and reverse directions. At this time, while the mobile connection bracket 535 connected to the drive chain 532 moves along the drive chain 532, the attitude of the altitude angle adjustment actuator 530 is converted, and the attitudes of the array blocks 510 and 520 are changed in conjunction with this. The altitude angle can be adjusted.

A plurality of solar cell panels 600 are installed on the upper and lower array blocks 510 and 520, respectively. The shaded area by the solar cell panel 600 installed in the lower array block 510 may be installed so as not to overlap with the arrangement position of the solar cell panel 600 installed in the upper array block 520. Therefore, by adjusting the azimuth and altitude angle according to the sun position, the solar light is directly incident on the solar panel 600 can increase the photovoltaic power generation efficiency.

Here, according to the present invention, by rotating the turntable block 400, the solar cell panel 600 is uniaxially adjusted by the azimuth adjustment, and the altitude angle adjustment actuator 530 is adjusted to adjust the attitude of the array block 500. Thus, the solar cell panel 600 can be biaxially adjusted.

1, 2 and 21, the wind generator 700 is rotatably mounted on the upper portion of the wind pole 710 and the wind pole 720 installed in the upper center of the azimuth rotation guide block 200. The rotating blade unit 720 is installed, and the generator 730 is installed on the upper portion of the wind turbine 710.

A wind generator base pad 711 is formed at a lower end of the wind pole 710 to be bolted to the wind pole coupling pad 230 of the azimuth rotation guide block 200. In addition, the wind turbine 710 may further include a coupling shaft 713 protruding downward from the wind turbine base pad 711 to be coupled to the block pillar 220. Therefore, the wind pole 710 may be firmly installed at the upper center of the azimuth rotation guide block 200. The wind pole 710 is positioned at the center of the turntable block 300 to serve as a rotation center axis of the turntable block 300.

The rotary blade unit 720 is rotatably installed on the upper portion of the wind pole 710, so that it is possible to produce electrical energy through the generator 730 while being rotated regardless of the wind direction. The rotary blade unit 720 may be a variety of examples, and specific examples are not intended to limit the present invention, description of the specific configuration will be omitted. However, the wind generator 730 may be easily installed by coupling between the wind turbine 710 and the blade unit 720 in the field.

In addition, according to the present invention, the basic block 100, the azimuth rotation guide block 200, the turntable block 300, the tilter block 400, the array block 500 to block the mass production is possible in the factory, Since each block produced in mass production is simply transferred to the site and installed and assembled, there is an advantage that the installation work is easy, the time is shortened, and the non-skilled person can be easily installed.

In addition, by blocking and standardizing, no separate setting work is required after installation, and the replacement and assembling of only the blocks to be replaced can be performed even when the replacement is installed due to the failure and damage of a specific block. There is an advantage.

That is, as described above, the foundation block 100 may be fixedly installed on the ground by using the gravel and concrete pouring method at a predetermined depth, as described with reference to FIGS. 1 to 6.

The kit is mounted on the upper portion of the foundation block 100 to sequentially assemble and install the azimuth rotation guide block 200, the turntable block 300, the tilter block 400, the array block 500, and the wind power generator 700. . When the solar panel 600 is mounted on the array block 500, the installation work of the hybrid wind and photovoltaic device 10 for arable land of the present invention is completed. At this time, since the height of the base block 100 is set to be set to approximately 3m, even if installed on the cultivated land does not interfere at all to work. Therefore, even if a large number of devices of the present invention on the arable land does not interfere with farming work, there is an advantage that can be utilized for a multi-purpose farming land for farming.

On the other hand, the height of the tilt supporter 320 can be installed by adjusting the height manually. That is, when the tilt supporter 320 is bolted to the turntable frame 310 for installation, the mounting position is adjusted by bolting by adjusting the installation position up and down, and thus the height can be adjusted in steps, and the height is fixed after assembly. Therefore, according to the season, that is, according to the autumn, autumn, autumn, winter solstice by adjusting the fixed position can be used after adjusting the installation height of the tilter support 320.

As described above, according to the present invention, since the blocked parts can be assembled through a simple assembly process in the field, the installation work time can be saved, and even an unskilled person can be easily assembled, and the overall installation is possible. The cost can be reduced. In particular, since it has an optimized height and a double compact structure for installing during cultivation, it is possible to install without affecting the growth of crops and disturbing on farming days. Economics can be increased and income can be expected to increase.

While the invention has been shown and described in connection with preferred embodiments for illustrating the principles of the invention, the invention is not limited to the configuration and operation as such is shown and described. Rather, those skilled in the art will appreciate that many changes and modifications to the present invention are possible without departing from the spirit and scope of the appended claims.

100..Basic Block 110..Concrete Building
120. Wrinkle tube 130. Combination pad
140..Reinforced steel pipe
200. Azimuth rotation guide block 210. Base pad
220 .. Block pillar 230. Wind pillar coupling pad
240.Guide rail 250.Rail arm
260 Chain Chain 300 Turntable Block
310. Turntable frame 320. Tilt support
330. Azimuth drive motor 400. Tilt block
410. Tilter block frame 420. Array shaft support
Actuator Support Bracket 500 Array Block
510 Lower Array Block 520 Upper Array Block
511,521 .. Array Girder 512,522 .. Array Shale
513,523. Array drive shaft 600. Solar panel
700..Wind generator 710.Wind pillar
720. Rotating blade unit 730. Generator

Claims (7)

A foundation block fixedly installed on the ground;
An azimuth rotation guide block assembled and connected to an upper portion of the foundation block and having a guide rail coupled to an outer chain;
A turntable block installed on an upper portion of the azimuth rotation guide block to be supported by a guide roller installed on the upper portion of the azimuth rotation guide block;
A tilter block installed on an upper side of the turntable block to be inclined differently in height;
An array block rotatably installed on an upper portion of the tilter block and a solar cell panel installed on an upper portion of the tilter block;
An altitude angle actuator disposed between the tilter block and the array block to adjust an altitude angle of the array block; And
And a wind generator fixed to the center of the base block and installed at the center to support the rotation of the turntable block.
The azimuth rotation guide block,
A base pad coupled to an upper end of the base block;
A block pillar installed at an upper center of the base pad;
A wind turbine coupling pad coupled to the upper portion of the block pillar;
Ring guide rails;
A rail arm connecting the guide rail and the block pillar; And
Hybrid wind and photovoltaic device for arable land comprising a; chain installed on the outer circumference of the guide rail. The method of claim 1, wherein the base block,
Cylindrical concrete tube made of concrete;
Corrugated pipe is installed on the inner circumference of the concrete pipe;
A plurality of coupling pads installed at upper and lower ends of the concrete pipe; And
Hybrid wind and photovoltaic device for arable land comprising a; is connected by connecting the coupling pads of the upper and lower, reinforcing steel pipe is installed in the concrete pipe. delete The method of claim 1, wherein the turntable block,
Turntable frames;
A tilt supporter installed to protrude upward from both sides of the upper part of the turntable frame;
An azimuth drive motor installed on the front of the turntable frame and interlocked with the chain; And
And a support roller installed at a lower portion of the turntable frame and supported at an upper portion of the azimuth rotation guide block. The method of claim 4, wherein the tilter block,
A tilter block frame having one side connected to the tilter support and the other side connected to the turntable frame and having a frame shape;
An array rotation shaft support protruding to the upper portion of the tilter block frame; And
And a plurality of actuator support brackets spaced apart from the tilter block frame. The method of claim 5, wherein the array block,
A lower array block installed on the tilter block and installed at a relatively low position, and an upper array block installed at a relatively high position,
Each of the lower and upper array blocks,
crossbeam;
An array shagrae installed on an upper portion of the girder and having a solar panel installed thereon; And
And a drive shaft installed at a lower portion of the girder and connected to the array rotation shaft support. According to any one of claims 1, 2 and 4 to 6, The wind power generator,
A wind turbine having a lower end installed perpendicular to the center of the azimuth rotation guide block and serving as a central axis of rotation of the turntable block is supported.
A rotary blade unit rotatably installed on an upper portion of the wind turbine; And
And a generator installed on the wind pole to produce electrical energy from the rotational force of the rotary blade unit.

Images