KR101013296B1 - Waterpower generating system using elevating lateral type waterwheel on water - Google Patents

Abstract

PURPOSE: A lift type horizontal water mill power generating system is provided to manually or automatically vary the position of a lifting unit and a rotating unit according to increment in water level of river or sea. CONSTITUTION: A lift type horizontal water mill power generating system comprises a lifting unit(110), a rotating unit(120), a lifting guide unit(130), and an acceleration and reduction module(111). The lifting unit is installed in multiple structures in river and sea to be elevated. The rotating unit is rotated by the flowing water in river and sea and is installed in the lifting unit. The rotating unit comprises a rotation body(122) and multiple blades(126). A rotary shaft(121) is formed on both sides of a rotation body. The multiple blades are installed on the outer surface of the rotation body. The lifting guide unit lifts the lifting unit and the rotating unit along the longitudinal direction of the structure. The acceleration and reduction module is connected to the rotary shaft. The multiple blades comprise a base portion and a blade portion. The base portion is close to the outer surface of the rotation body.

Description

Lifting-type horizontal water aberration power generation system {WATERPOWER GENERATING SYSTEM USING ELEVATING LATERAL TYPE WATERWHEEL ON WATER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting type horizontal water surface aberration power generation system, and more particularly, to a lifting type horizontal water surface aberration power generation system that obtains electrical energy by using river and sea water.

Currently, fossil fuels, which account for 88% of the world's energy consumption, are finite resources. The service life of oil and natural gas is only about 50 to 60 years, and coal is expected to have a lifetime of about 300 years. Therefore, new energy sources must be developed in the second half of the 21st century, and it will be a significant problem until new energy is developed and supplied.

In order to solve this problem, various power generation systems using hydroelectric power, wind power, nuclear power, and solar power have been developed and applied.

In general, a hydroelectric power system converts water's potential energy into kinetic energy to obtain electrical energy. However, in order to build such a hydroelectric power generation system, it is necessary to select an appropriate place and install a water repellent in the dam (including artificial lakes) or the sea, so that the water sinked through the dam installation would have to occur. And the fishermen's repulsion is large and there is a problem that must be enormous costs in the entire system installation.

Therefore, there is an urgent need to develop a device capable of obtaining almost unlimited energy using river water or seawater, which is relatively infinite compared to fossil fuels, without the need to install a separate facility, which requires a large amount of construction costs, such as a dam or a dike. It is necessary.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lifting type horizontal water surface aberration power generation system which is installed in a river or sea and can generate electric energy using a running water as a low head source of a river or sea.

The solution to the problem of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

The object, according to the present invention, the lifting unit is provided to be elevated in the longitudinal direction of the structure for a plurality of structures installed in the river or the sea; A rotating part installed in the lifting part and hitting and rotating by running water of the river or the sea; And a lift induction unit installed on the structure to lift the lift unit and the rotary unit along a longitudinal direction of the structure.

Here, the rotating unit, the rotating body is rotatably installed on the lifting unit is provided with a rotating shaft on both sides; And a plurality of blades installed on an outer surface of the rotating body, wherein the plurality of blades include: a base part disposed adjacent to the outer surface of the rotating body; And it may include a wing portion bent from the base portion.

It may further include a deceleration module connected to the rotary shaft for decelerating or accelerating the rotational speed of the rotary shaft.

It may further include an energy supply means for storing or transmitting the electrical energy generated through the rotary unit and the deceleration acceleration module to the outside.

The energy supply means may be an AC power transmission tower installed on a storage battery or the structure.

A guide rod may be protruded from the lifting portion to prevent shaking of the lifting portion and the rotating portion during the lifting of the lifting portion, and the guide groove may be provided at the structure to guide the movement of the guide rod.

The elevating induction part includes a linear moving module installed on the lifting unit and the structure adjacent to the lifting unit, and the linear moving module includes: a linear moving body fixedly installed on the lifting unit; And it may include a linear guide installed along the longitudinal direction of the structure.

A surface height sensor installed on the structure to detect the surface height of the river or the sea; A distance detecting sensor installed in the structure to detect a distance between the lifting unit and the lifting unit; And a controller configured to control the operation of the elevating induction part by receiving the detection values of the sleep height sensor and the distance sensor.

The lifting induction part is installed in the structure, one end of the wire is fixed to the lifting unit comprises a plurality of rotation winch is wound or released, the lifting unit, a plurality of rotation winch operated by receiving the control signal of the control unit By the rotation of the can be elevated along the longitudinal direction of the structure.

The lifting induction part is installed in the structure, one end of the wire is fixed to the lifting unit comprises a plurality of rotation winch is wound or unwind, the lifting portion along the longitudinal direction of the structure by the rotation of the plurality of rotation winch You can get on and off.

The rotating body includes an opening portion and a body portion having an accommodation space therein; And a cover part installed to open and close at an opening of the body part, and further comprising a blade rotating part configured to change an installation direction of the plurality of blades with respect to the rotating body according to the flow direction of the river or the sea.

Each of the plurality of blades further includes a protrusion protruding from the base portion to be inserted into a through hole formed in the body portion, and the blade rotating portion includes: a plurality of spur gears integrally provided with the protrusion portion; And it may include a rotating unit for rotating the plurality of spur gears.

The rotating unit may include a plurality of drive gears meshed with the plurality of spur gears and having a rotating shaft formed at a central portion thereof; A drive motor connected to any one of the rotation shaft portions of the plurality of drive gears; And it may include a power transmission unit for connecting between the plurality of rotary shaft portion to transfer the driving force of the drive motor to the plurality of rotary shaft portion, respectively.

The power transmission unit may be any one selected from a belt and pulley combination, a chain and sprocket wheel combination, and a plurality of gear combinations.

The rotating unit may include a plurality of drive gears engaged with the plurality of spur gears; A plurality of hydraulic motors each rotating the plurality of drive gears; And a hydraulic pump for supplying hydraulic pressure to the plurality of hydraulic motors to operate the hydraulic motor.

According to the present invention, it can be installed in a river or the sea to generate electrical energy using the running water as a low head source of the river or the sea.

In addition, as the level of the river or sea water rises, it is possible to elevate the position of the lifting unit and the rotating unit automatically or manually.

In addition, as the flow direction of the seawater is changed, it is possible to change the installation direction of the blade correspondingly.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a state diagram showing a lifting-type horizontal water surface aberration power generation system according to an embodiment of the present invention.
2 is a view showing a state in which the lifting guide portion is applied to another example in FIG.
3 is a cross-sectional view showing a rotating part of a lifting type horizontal water surface aberration power generation system according to an embodiment of the present invention.
4 is a diagram illustrating a detailed configuration of an example of a rotating unit in a lifting type horizontal water surface aberration power generation system according to an embodiment of the present invention.
5 is a view showing a detailed configuration of another example of the rotating unit in the lifting-type horizontal water surface aberration power generation system according to an embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a state diagram showing a lifting type horizontal water surface aberration power generation system according to an embodiment of the present invention, Figure 2 is a view showing a state in which the lifting guide portion is applied to another example in Figure 1, Figure 3 is an embodiment of the present invention 4 is a cross-sectional view illustrating a rotating part of the lifting type horizontal water surface aberration power generation system according to the present invention, and FIG. 4 is a view illustrating a detailed configuration of the rotating part in the lifting type horizontal water surface generation power generation system according to an embodiment of the present invention, and FIG. 10 is a diagram illustrating a detailed configuration of another example of a rotating part in a lifting type horizontal water surface aberration power generation system according to an embodiment.

As shown in these drawings, the lifting-type horizontal water surface aberration power generation system (hereinafter referred to as a "power generation system") according to an embodiment of the present invention, is installed in a river or the sea using river water (river or sea water) Power is generated or installed near the beam to generate power by receiving the force of the fluid from the falling fluid overflowing the beam. Specifically, as a low head water soureces in rivers or seas. It is possible to generate electrical energy by using flowing water or using flowing water falling with a certain height difference. In addition, in the case where the power generation system according to the present embodiment is installed near the beams, the power generation system according to the present embodiment may exhibit considerable power generation capability when the height difference of the flow of water flowing over the beams and falling down is approximately 1.5 m or more. Can be.

As shown in FIG. 1 and FIG. 2, such a power generation system includes a lifting unit 110 which is installed to be elevated in a longitudinal direction of the structure 100 with respect to a plurality of structures 100 installed in a river or the sea. Is installed on the elevating unit 110, and rotates by the flow of the river or sea 120 and the structure 100 is installed on the elevating unit 110 and the rotating unit 120 in the longitudinal direction of the structure 100 It includes a lift induction unit 130 to be lifted along.

The structure 100 in the present specification may include a pier and a top plate member installed in a river or sea, a separate pillar member not related to the pier, and the like. On the other hand, the structure 100 to be described below refers to a pier or a separate pillar member unless otherwise described.

First, as shown in Figures 1 and 2, the lifting unit 110 is installed in the structure 100 to be able to lift in the longitudinal direction of the structure 100, the lower portion is rotatable 120 is rotatable Is installed.

The elevating unit 110 is installed to be elevated by the elevating induction unit 130 which will be described later, so that the elevating movement is made more smoothly, the elevating unit 110 has a light weight of its own, yet easily outward appearance by the impact of flowing water. It is preferred to be made of a material having sufficient rigidity to the extent that it does not break.

In this embodiment, the lifting unit 110 may be formed to have an inner receiving space, the deceleration acceleration module 111 to be described later is disposed in the inner receiving space of the lifting unit 110. However, the present invention is not limited thereto, and the deceleration acceleration module 111 may be provided in a separate module box (not shown) provided at the outside of the lifting unit 110. In this case, one sprocket wheel (not shown) is connected to each of the rotating shafts 121 on both sides, and another sprocket wheel is connected to the outside of the lifting unit 110 through the above-described sprocket wheel and a chain. Is placed. The pair of sprocket wheels disposed on the outer side of the elevating unit 110 are interconnected by a rotation drive shaft and a spur gear is connected to the rotation drive shaft. It is also possible to engage a plurality of gears in such a spur gear to bring an increase in torque.

The rotating part 120 rotates substantially by the hit by the flowing water, and the rotating part 110 is freely provided with the rotation.

The rotating unit 120 is rotatably installed on the lifting unit 110, the rotating body 122 is provided on both sides of the rotating shaft 121, and the plurality of blades 126 are installed on the outer surface of the rotating body 122 It includes.

Rotating body 122 preferably has a circular cross-sectional shape so that it can be rotated more smoothly by the impact of the flowing water, and like the lifting unit 110, the weight is light, but the appearance is easily broken by the impact of flowing water It is preferable that it is made of a material having sufficient rigidity not to the extent that it does not. For example, the lifting unit 110 and the rotating unit 120 may be made of steel, stainless steel, aluminum, general / high rigidity FRP.

On the other hand, in general, the flow direction of the river does not change, while the seawater near the shore is a reality that the flow direction is regularly changed over time.

Therefore, when the power generation system according to the present embodiment is installed in the steel, the installation direction of the plurality of blades 126 does not need to be changed, and the rotating body 122 may be formed as an integral structure having an internal space, and furthermore, It may be additionally filled with a floating auxiliary material such as strofoam.

However, when the power generation system according to the present embodiment is installed on the sea near the shore where the tidal difference is severe, it is preferable that the installation directions of the plurality of blades 126 be changed regularly according to the flow direction of the seawater. If the seawater flows in the forward direction and in the reverse direction, the rotation of the blade 126 is not easy unless the direction of the blade 126 is changed correspondingly.

That is, as shown in (a) and (b) of FIG. 3, even if the power generation system is installed on the sea so that the flow direction of the seawater is regularly changed, the installation direction of the blade 126 should be changed accordingly. do. To this end, the rotating body 122 is configured to include a body portion 123 having an opening formed therein and an accommodation space provided therein, and a cover portion 125 installed to be opened and closed at an opening of the body portion 123. Can be. In addition, the inside of the body 123 is provided with a blade rotating unit 140 for changing the installation direction of the plurality of blades 126 for the rotating body 122 in accordance with the flow direction of the river or the sea flow, such blade rotating unit 140 will be described below.

As shown in FIG. 4, the plurality of blades 126 include a base portion 127 disposed adjacent to the outer surface of the rotating body 122 and a wing portion 128 bent from the base portion 127. Include. In this case, the plurality of blades 126 may be attached to the rotating body 122 by, for example, the base portion 127 through a bonding method such as welding.

The plurality of blades 126 may be formed such that one row of blades disposed on substantially the same straight line along the longitudinal direction of the rotating body 122 is disposed to be spaced apart in plurality along the circumferential direction of the rotating body 122. have. In addition, the plurality of blades 126 are arranged so that one row of blades arranged left and right alternately with respect to one virtual straight line along the longitudinal direction of the rotating body 122 is spaced apart in plurality along the circumferential direction of the rotating body 122. It may also be formed.

In the present embodiment, the plurality of blades 126 preferably have a shape that can contain more than a certain amount of water while raising the mutual contact area with the flowing water at the time of hitting the flowing water. For example, the blade 126 may be similar to the bucket shape of the excavator.

The blade rotating part 140 is for automatically changing the installation direction of the blade 126 to correspond to the flow direction of the flowing water when the power generation system according to the present embodiment is installed in the sea as an example, and the rotating body 122 ) Is preferably configured to include the body portion 123 and the cover portion 125 as described above.

In this case, as shown in FIG. 4, each of the plurality of blades 126 further includes a protrusion 129 protruding from the base 127 so as to be inserted into the through hole 124 formed in the body 123. . Here, it is preferable that a separate sealing member (not shown) is provided in the through hole 124 for airtightness.

As shown in FIG. 4, the blade rotating unit 140 includes a plurality of spur gears 141 integrally provided in the protrusion 129 and a rotating unit 142 for rotating the plurality of spur gears 141. do.

Here, the rotation unit 142 is engaged with the plurality of spur gears 141, the plurality of drive gears 143, the rotation shaft portion 144 is formed in the center, and the rotation shaft portion 144 of the plurality of drive gears 143. Power transmission unit for connecting between the plurality of rotary shaft portion 144 so as to transmit the driving motor 145 connected to any one of the rotating shaft portion and the driving motor 145 to the plurality of rotary shaft portion 144, respectively. 146. On the other hand, the drive motor 145 may be applied as a hydraulic or pneumatic motor, the initial drive power for driving this is a separate power supply line electrically connected to the storage battery 150 or a separate power supply (not shown) (described later) ( Not shown).

On the other hand, the power transmission unit 146 may be applied to the belt and pulley combination 146, but is not necessarily limited thereto, and may be applied to a chain and sprocket wheel combination or a plurality of gear combinations.

Meanwhile, as shown in FIG. 5, another example of the rotating unit 142a includes a plurality of drive gears 143 meshed with a plurality of spur gears 141, and a plurality of drive gears 143, respectively. A plurality of hydraulic motor 145a and a hydraulic pump 147 for supplying hydraulic pressure to the plurality of hydraulic motor 145a to operate the hydraulic motor 145a.

In this embodiment, the operator may open the cover 125 to enter the body 123 and then operate the driving motor 145 to rotate the blade 126. More specifically, the rotation shaft 144 and the driving gear 143 directly connected to the driving motor 145 are rotated by the operation of the driving motor 145, and all the remaining rotation shaft portions 146 are driven by the power transmission unit 146. 144 and the drive gear 143 is rotated accordingly all the spur gears 141 is rotated to change the installation angle of the blade 126 to the outer surface of the rotating body 122.

On the other hand, although not shown in the figure, after forming a separate through-hole (not shown) in the protrusion 129, the installation direction of the blade 126 may be changed by manual labor of the operator. Specifically, the operator opens the cover 125 to enter the body 123 and then inserts a rod (not shown) into the through hole (not shown) and then forcibly rotates the rod (not shown) accordingly. Rotation of the blade 126 may also occur.

1 and 2, the power generation system according to the present embodiment is connected to the rotary shaft 121 of the rotary body 122, the deceleration acceleration module 111 for reducing or accelerating the rotational speed of the rotary shaft 121 More).

This deceleration module 111 is to increase or decrease the torque generated from the blade 126 by hitting the flowing water, in this embodiment, the deceleration module 111 is to act as an acceleration module substantially. However, if necessary, the acceleration / deceleration module 111 may also function as a reduction module. For example, if the rotational speed of the blade 126, that is, the rotational torque is largely exceeded by a setting due to, for example, flooding, it is applied when it is necessary to reduce it by a certain amount.

The rotating torque generated by the rotation of the rotating unit 120 by the stroke of the flowing water passes through the deceleration acceleration module 111 and is transmitted to the energy supply means 150 with the torque substantially increased.

The energy supply means 150 is to store the electrical energy generated through the rotating unit 120 and the deceleration module 111, it may be applied to the structure 100 or the storage battery 150 provided in a separate place. The electrical energy stored in the storage battery 150 may act as a driving source of the driving motor 145 described above.

On the other hand, as another example of the energy supply means, the energy supply means may be applied to an AC transmission tower (not shown) for transmitting the electrical energy generated through the rotating unit 120 and the deceleration acceleration module 111 to other places. That is, the electrical energy generated through the rotating unit 120 and the deceleration module 111 is directly supplied to an AC transmission tower (not shown) and then transmitted to another place.

AC transmission tower (not shown) may be installed in the structure 100, more preferably, is not installed on the top plate member of the piers, but a separate base member (not shown) installed as another structure other than the top plate member It is preferably installed in. Therefore, it is possible to prevent the occurrence of collapse due to the increase in the supporting load of the existing bridge.

1 and 2, the power generation system according to the present embodiment, is installed on the structure 100, the water level sensor 170 for detecting the height of the river or the sea surface, and the structure 100 Installed to receive the distance detection sensor 171 for detecting the distance between the elevating unit 110 and the detection value of the water level detecting sensor 170 and the distance detecting sensor 171 to control the operation of the elevating induction unit 130 The control unit 172 further includes.

That is, the surface height sensor 170 and the distance sensor 171 is for detecting the distance for elevating the height of the elevating unit 110, that is, the rotating unit 120 to correspond to the rise of the water level of the river or sea water. The laser sensor, the infrared sensor, the ultrasonic sensor, and the like may be applied to a conventional sensor used for distance sensing.

In the present embodiment, after the control unit 172 receives the detection values of the surface height sensor 170 and the distance sensor 171, the control unit 172 transmits an operation signal to the lift guide unit 130 to position the lift unit 110. Will be adjusted automatically. However, the present invention is not limited thereto, and the operator may manually adjust the height of the elevating unit 110 by rotating the rotary winch 131 when the elevating induction unit 130 to be described later is applied as the rotary winch 131. In the following description, the position of the elevating unit 110 is described based on the control of the control unit 172.

As shown in FIG. 1, the elevating induction part 130 is installed in the structure 100 as an example, and a plurality of rotary winches 131 are wound or unwound with one end of the wire 132 fixed to the elevating part 110. It includes. Here, the rotary winch 131 is installed to rotate by receiving the operation signal of the control unit 172. Accordingly, the lifting unit 110 is a structure 100 while the wire 132 is wound or unwound by the rotation winch 131 by the rotation of a plurality of rotary winch 131 that operates by receiving a control signal from the control unit 172. In the longitudinal direction.

On the other hand, as shown in Figure 1, during the lifting of the elevating unit 110 in accordance with the rotation of the rotary winch 131, the shaking of the elevating unit 110 and the rotating unit 120, specifically prevents the phenomenon of shaking in the front and rear direction In order to provide a structure, the guide groove 101 for guiding the lifting of the lifting unit 110 is preferably provided.

In more detail, the guide rods 112 are formed on both sides of the lifting unit 110, and the guide grooves 101 are provided at the structure 100 to guide the movement of the guide rods 112. Here, the guide groove 101 is preferably a long hole-shaped groove formed in the longitudinal direction of the structure 100.

As shown in FIG. 2, the lifting guide unit 130 includes, as another example, a linear moving module 133 installed on the lifting unit 110 and the structure 100 adjacent to the lifting unit 110.

Here, the linear moving module 133 includes a linear moving body 134 fixed to the lifting unit 110 and a linear guide 135 installed along the longitudinal direction of the structure 100. The linear moving module 133 applies the principle of the linear motor, and the linear moving body 134 moves linearly depending on whether the power is supplied to the linear guide 135. That is, according to the linear movement of the linear moving body 134, the lifting unit 110 is capable of lifting in the longitudinal direction of the structure 100. Here, the power applied to the linear guide 135 may be supplied from the above-described storage battery 150 or a separate power supply device (not shown).

The embodiments and drawings attached to this specification are merely to clearly show some of the technical ideas included in the present invention, and those skilled in the art can easily infer within the scope of the technical ideas included in the specification and drawings of the present invention. Modifications that can be made and specific embodiments will be apparent that both are included in the scope of the invention.

101: guide groove 110: elevating unit
111: deceleration module 112: guide rod
120: rotating part 122: rotating body
123: body portion 125: cover portion
126: blade 129: protrusion
130: elevating guide 131: rotary winch
133: linear moving module 140: blade rotation
150: storage battery 170: sleep height sensor
171: distance sensor 172: control unit

Claims (15)

Lifting unit is installed to be elevated in the longitudinal direction of the structure for a plurality of structures installed in the river or the sea;
A rotating body installed on the elevating part and being hit by the flowing water of the river or the sea, rotatably installed on the elevating part, and provided with rotation shafts on both sides thereof, and a plurality of blades installed on the outer surface of the rotating body. Rotating portion comprising;
An elevating induction part installed in the structure to elevate the elevating part and the rotating part along a longitudinal direction of the structure; And
A deceleration acceleration module connected to the rotation shaft to decelerate or accelerate the rotation speed of the rotation shaft,
The plurality of blades,
A base part disposed adjacent to an outer surface of the rotating body; And
A lifting type horizontal water aberration power generation system, characterized in that it comprises a wing portion bent from the base portion. delete delete The method of claim 1,
Elevated horizontal water surface aberration power generation system, characterized in that it further comprises an energy supply means for storing or transmitting the electrical energy generated through the rotating unit and the deceleration acceleration module to the outside. The method of claim 4, wherein
And said energy supply means is an alternating current transmission tower installed on a storage battery or said structure. The method of claim 1,
In order to prevent shaking of the lifting unit and the rotating unit during the lifting of the lifting unit, the lifting unit is provided with a guide rod protruding, and the structure is provided with a guide groove to guide the movement of the guide rod Sleep aberration generation system. The method of claim 1,
The elevating induction part includes a linear moving module installed in the elevating part and the structure adjacent to the elevating part,
The linear moving module,
A linear moving body fixed to the lifting unit; And
And a linear guide installed along the longitudinal direction of the structure. The method of claim 1,
A surface height sensor installed on the structure to detect the surface height of the river or the sea;
A distance detecting sensor installed in the structure to detect a distance between the lifting unit and the lifting unit; And
And a control unit configured to control the operation of the elevating induction unit by receiving the detected values of the water level detecting sensor and the distance detecting sensor. The method of claim 8,
The lifting induction part is installed in the structure, one end of the wire is fixed to the lifting unit includes a plurality of rotary winch is wound or released,
The lifting unit, the lifting type horizontal water surface aberration power generation system, characterized in that the lifting and lifting along the longitudinal direction of the structure by the rotation of a plurality of rotary winch operating by receiving the control signal of the control unit. The method of claim 1,
The lifting induction part is installed in the structure, one end of the wire is fixed to the lifting unit includes a plurality of rotary winch is wound or released,
And the elevating unit is elevated along the longitudinal direction of the structure by the rotation of the plurality of rotary winches. The method of claim 1,
The rotating body,
An opening portion formed therein and a body portion having an accommodation space therein; And
Includes a cover portion which is installed to open and close in the opening of the body portion,
And a blade rotating unit configured to change an installation direction of the plurality of blades with respect to the rotating body according to the flow direction of the river or the sea. The method of claim 11,
Each of the plurality of blades further includes a protruding portion protruding from the base portion to be inserted into a through hole formed in the body portion.
The blade rotating portion,
A plurality of spur gears provided integrally with the protrusions; And
And a rotating unit for rotating the plurality of spur gears. The method of claim 12,
The rotating unit,
A plurality of drive gears meshed with the plurality of spur gears and having a rotating shaft portion formed in a central portion thereof;
A drive motor connected to any one of the rotation shaft portions of the plurality of drive gears; And
And a power transmission unit for connecting the plurality of rotation shaft portions to transmit the driving force of the driving motor to the plurality of rotation shaft portions, respectively. The method of claim 13,
And the power transmission unit is any one selected from a belt and pulley combination, a chain and sprocket wheel combination, and a plurality of gear combinations. The method of claim 12,
The rotating unit,
A plurality of drive gears meshed with the plurality of spur gears;
A plurality of hydraulic motors each rotating the plurality of drive gears; And
And a hydraulic pump for supplying hydraulic pressure to the plurality of hydraulic motors to operate the hydraulic motors.

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