KR20240044224A - Rotating net cleaning device - Google Patents

Abstract

One embodiment of the present invention provides a device that cleans a net simultaneously with a water jet and a brush by attaching a brush to a nozzle spraying at high pressure. A rotary net cleaning device according to an embodiment of the present invention includes a housing in which an internal space is formed; A nozzle unit coupled to the inside of the housing unit and spraying high-pressure water; and a brush coupled to the nozzle portion and at least a portion of the brush exposed to the outside of the housing.

Description

Rotating net cleaning device {Rotating net cleaning device}

The present invention relates to a rotary net cleaning device, and more specifically, to a device that cleans a net simultaneously with a water jet and a brush by attaching a brush to a nozzle spraying at high pressure.

In cage farms, various shellfish and seaweed can attach to the net at sea, blocking the net or preventing the inflow of clean seawater into the fish farm, which can cause internal water quality to deteriorate, leading to the death of farmed fish, and the weight of the net due to various attached organisms. As it becomes heavier, nets are damaged and fish are lost.

To solve this problem, nets are replaced more than three times a year and farmed fish are moved to other nets. Problems such as loss of farmed fish and death of farmed fish due to stress are occurring, and net replacement requires a lot of labor and capital.

Republic of Korea Patent No. 10-2110467 (title of the invention: Automatic net cleaning device for shellfish farming and automatic net cleaning system having the same) includes a main body fixed to the ground; A nozzle header installed to extend in the vertical direction on one side of the main body and reciprocating up and down, and at least one device formed in the nozzle header and spraying the washing water supplied into the nozzle header into a net mounted on one side of the main body. A spraying unit including one or more spraying nozzles; a nozzle lifting unit that continuously reciprocates the nozzle header up and down; a washing water supply unit connected to the nozzle header and supplying washing water to the inside of the nozzle header; And, a net rotation unit installed on one side of the main body in contact with the long net, and rotating the long net about an axis perpendicular to the ground when spraying washing water.

However, this conventional technology has the problem of being difficult to use in large cage fish farms as it is a technology for cleaning small-sized traps where oysters, shellfish, etc. are located. Therefore, a device that moves underwater and cleans large nets is needed.

Republic of Korea Patent No. 10-2110467

The purpose of the present invention to solve the above problems is to clean the net while the water jet and brush rotate simultaneously to remove deposits located on the net.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

The configuration of the present invention for achieving the above object includes a housing in which an internal space is formed; A nozzle unit coupled to the inside of the housing unit and spraying high-pressure water; a brush coupled to the nozzle unit and at least a portion of the brush exposed to the outside of the housing, wherein the brush is rotated in the same direction as the nozzle unit by the flow of the high-pressure water sprayed from the nozzle unit, forming a net; Characterized by cleaning.

In an embodiment of the present invention, the nozzle unit includes a supply pipe coupled to the housing and through which high-pressure water moves; A nozzle coupled to the supply pipe and through which high-pressure water is sprayed; and a rotation joint coupled to the supply pipe and transmitting rotational force to the supply pipe and the nozzle.

In an embodiment of the present invention, the nozzle unit may further include a hydraulic pump connected to the supply pipe and spraying the high-pressure water to the outside of the nozzle.

In an embodiment of the present invention, at least one nozzle may be formed.

In an embodiment of the present invention, the nozzle may include a nozzle tip that is coupled to the nozzle and adjusts the spray amount of the high-pressure water sprayed from the nozzle.

In an embodiment of the present invention, the brush may be separated from or combined with the nozzle unit.

In an embodiment of the present invention, the housing may further include a monitoring unit coupled to the housing and monitoring attachments attached to the net.

In an embodiment of the present invention, the monitoring unit includes an underwater camera coupled to the inner side of the housing and capturing an attachment attached to the net; and a light coupled to the inner surface of the housing, positioned adjacent to the camera, and emitting light to the net.

In an embodiment of the present invention, the housing may further include a control unit coupled to the inside of the housing and controlling the hydraulic pump.

In an embodiment of the present invention, in a rotary net cleaning method, the monitoring unit monitors attachments and contaminants attached to the net; spraying the high-pressure water from the nozzle unit; Rotating the nozzle unit by the flow of the high-pressure water sprayed from the nozzle unit; Rotating the brush in the same direction as the nozzle unit by rotating the nozzle unit; And it may include a step of washing the net by high-pressure water sprayed from the nozzle unit and rotation of the brush.

In an embodiment of the present invention, the step of rotating the brush in the same direction as the nozzle unit may include combining the brush with the nozzle unit so that the brush can be rotated in the same direction in which the nozzle unit is rotated.

The effect of the present invention according to the above configuration is that the water jet and the brush rotate simultaneously to clean the net, thereby easily removing attachments and contaminants located on the net.

The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a cross-sectional view of a rotary net cleaning device according to an embodiment of the present invention.
Figure 2 is a cross-sectional view of a rotating net cleaning device further provided with a fixing part according to an embodiment of the present invention.
Figure 3 is a cross-sectional view showing the brush portion of the rotary net cleaning device according to an embodiment of the present invention separated.
Figure 4 is a view showing the lower surface of a rotary net cleaning device according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention may be implemented in various different forms and, therefore, is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this means not only "directly connected" but also "indirectly connected" with another member in between. "Includes cases where it is. Additionally, when a part is said to “include” a certain component, this does not mean that other components are excluded, but that other components can be added, unless specifically stated to the contrary.

The terms used in this specification are merely used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a cross-sectional view of a rotary net cleaning device according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the rotary net cleaning device further provided with a fixing part according to an embodiment of the present invention, and Figure 3 is a cross-sectional view of the rotary net cleaning device according to an embodiment of the present invention. It is a cross-sectional view showing the separation of the brush portion of the rotary net cleaning device according to an embodiment of the invention, and Figure 4 is a view showing the lower surface of the rotary net cleaning device according to an embodiment of the present invention.

As shown in Figures 1 to 4, the rotary net cleaning device includes a housing 100 in which an internal space is formed, a nozzle part that sprays high-pressure water, and a nozzle part coupled to the inside of the housing 100, At least a portion may include a brush portion 300 exposed to the outside of the housing 100.

At this time, the brush unit 300 is rotated in the same direction as the nozzle unit by the flow of high-pressure water sprayed from the nozzle unit, and the high-pressure water and the brush unit 300 can clean the net at the same time.

Here, the housing 100 has an internal space, and the cross-sectional shape of the housing 100 may be formed into a cup, cupola, or dome shape. The housing 100 may be made of a material having corrosion resistance and rigidity, such as stainless steel, so that it does not corrode in water and can withstand water pressure.

The housing 100 may be coupled to the nozzle portion and may be provided with a nozzle hole formed in the shape of a hole in the center of the upper surface of the housing 100 for coupling to the nozzle portion, and the nozzle portion may be attached to the outer surface of the housing 100. The rotation joint 220 may be coupled to a position corresponding to the hole.

The supply pipe 210 can be inserted into the nozzle hole, and the rotary joint 220 can be coupled to the supply pipe 210, so that the nozzle portion can be rotated by the rotary joint 220. The rotation joint 220 supports the nozzle unit so that it can rotate and can transmit rotational force.

The rotary joint 220 may have a bearing and may be formed of one or more bearings selected from ball bearings and double bearings.

As shown in Figure 4, the monitoring unit 600 can be coupled to one side of the inner surface of the housing 100 to photograph cleaning objects and foreign substances located in the net, and to the other side of the inner surface of the housing 100. The detection sensor 500 can be combined to detect cleaning objects and foreign substances located in the net.

As shown in Figures 2 and 3, the fixing part 400 may be formed at a position spaced a predetermined distance away from the lower edge of the outer surface of the housing 100, and the fixing part 400 has an 'ㄱ' shape. It can be formed, and the housing 100 and the fixing part 400 can be hinged.

The fixing part 400 can be rotated and fixed to the net, and the fixing part 400 can be hung on the net to temporarily couple the rotary net cleaning device to the net, which causes high-pressure water to be sprayed from the nozzle 230. The reaction force formed by the rotational net cleaning device can be prevented from moving away from the net, and the fixing part 400 maintains a constant distance between the housing 100 and the net to prevent the brush 321 from contacting the net. When the brush 321 rotates, attachments attached to the net can be removed and the net can be cleaned.

The nozzle unit is coupled to the housing 100 and includes a supply pipe 210 having a supply passage 211, and is coupled to the supply pipe 210, forming at least one nozzle 230 having a nozzle passage 231 and spraying high-pressure water. ), connected to the nozzle 230, coupled with a hydraulic pump and supply pipe 210 for spraying high-pressure water to the outside of the nozzle 230, and rotating the nozzle 230 by the high-pressure water sprayed from the hydraulic pump. It may include a joint 220. Here, the supply passage 211 and the nozzle passage 231 are coupled to each other at corresponding positions so that the fluid flowing into the supply passage 211 can be moved to the nozzle passage 231.

The nozzle 230 may be coupled to the supply pipe 210 in a downward direction of the supply pipe 210, and the nozzle 230 is generally formed in a structure inclined from the top of the nozzle 230 to the bottom of the nozzle 230. This can prevent high-pressure water passing through the nozzle 230 from flowing back.

As shown in Figures 1 to 3, in the cross section of the rotary net cleaning device of the present invention, the nozzle 230 is formed in a structure with a certain curvature and may be formed in a 'J'-shaped structure, and has a supply passage ( While the high-pressure water transferred from 211) passes, the nozzle portion may be rotated in place by the flow of high-pressure water.

The nozzle portion is a first nozzle formed by extending from one point of the lower edge of the supply passage 211 to one side in the circumferential direction, and a second nozzle formed by extending from the lower edge of the supply passage 211 to the other side in the circumferential direction. It may be provided, and the one point of the first nozzle and the striking point of the second nozzle may be located on an imaginary line passing through the center point of the supply passage, and the one point and the striking point of the lower edge are symmetrical from the center point of the supply passage 211. The first nozzle and the second nozzle may be formed in a direction perpendicular to the virtual line and may be formed to extend in directions symmetrical to each other.

The first nozzle sprays high-pressure water in a clockwise direction, and the second nozzle sprays high-pressure water in a counterclockwise direction. The first nozzle and the second nozzle rotate due to the difference in the high-pressure water spray direction between the first nozzle and the second nozzle. And, the supply passage 211 can be rotated by the rotation of the first nozzle and the second nozzle. In another embodiment, the first nozzle sprays high-pressure water in a counterclockwise direction, and the second nozzle sprays high-pressure water in a clockwise direction, so that the first nozzle and the second nozzle rotate due to the difference in the spray direction of the high-pressure water, thereby forming the supply flow path. (211) can be rotated. By rotating the nozzle 230, high-pressure water is rotated and sprayed to clean the net.

When the supply passage 211, the first nozzle, and the second nozzle are rotated by the spraying direction of the high-pressure water, the brush plate 320 coupled with the nozzle is rotated in the same direction as the nozzle due to the difference in the spraying direction of the high-pressure water, thereby generating rotational force. The brush 321 can be rotated to clean the net.

The diameter of the nozzle passage 231 of the nozzle 230 formed in the upper part of the nozzle 230 adjacent to the supply pipe 210 is narrower than the nozzle passage 231 of the nozzle 230 formed in the lower part of the nozzle 230. It may be formed, and as a result, when the fluid introduced into the nozzle passage 231 moves from the top of the nozzle 230 to the bottom, the pressure of the high-pressure water may increase, and the pressure of the high-pressure water in contact with the net may increase. It can make cleaning the net easier.

A plurality of nozzles 230 may be formed along the circumference of the housing 100, the supply pipe 210 and the plurality of nozzles 230 may be combined, and each nozzle passage 231 formed in the plurality of nozzles 230 ) is combined with the supply passage 211 of the supply pipe 210, so that fluid can be easily moved from the supply passage 211 to the plurality of nozzle passages 231. For this reason, when a plurality of nozzles 230 are provided, the number of times the attachment and high-pressure water come into contact within the same time increases compared to when a single nozzle is provided, so attachment or contaminants formed on the net can be easily removed.

The nozzle 230 may be combined with the nozzle tip 240, and the nozzle tip 240 may be combined with the nozzle 230 to control the strength and direction of the fluid sprayed from the nozzle 230. ) is formed to be separable from the nozzle 230, so that the attachment can be easily removed by changing the nozzle tip 240 depending on the degree of attachment of the attachment and the net.

The nozzle tip 240 has a nozzle hole formed in the shape of a hole on the central axis of the nozzle tip 240, and may be provided with a valve that can adjust the flow rate, and the valve can open and close the nozzle hole under the control of the control unit. In addition, the valve can control the amount of high-pressure water delivered from the nozzle passage 231 to the nozzle hole of the nozzle tip 240 by adjusting the degree of opening and closing of the nozzle hole.

Additionally, the nozzle tip 240 may be formed in a tilting shape, and the nozzle tip 240 may be tilted in a control direction under control of the control unit to adjust the direction of the fluid sprayed from the nozzle 230.

Due to this, the nozzle tip 240 is moved to the supply passage 211 by pumping fluid from the pump, and the fluid moved to the supply passage 211 is moved to the plurality of nozzles 230, and the nozzle passage 231 High-pressure fluid is formed due to the difference in diameter, and the high-pressure water moves to the nozzle tip 240 and is sprayed from the nozzle hole of the nozzle tip 240 to clean the net.

The nozzle unit may be connected to a hydraulic pump, and the hydraulic pump may be connected to the supply pipe 210 to spray high-pressure water to the outside of the nozzle 230. The hydraulic pump can suck seawater located underwater and move it to the nozzle 230 through the supply pipe 210.

That is, the hydraulic pump operates to suck in adjacent fluid, the fluid remaining in the hydraulic pump is moved to the supply passage 211 of the supply pipe 210 by the hydraulic pump, and the fluid remaining in the supply passage 211 is transferred to the nozzle. It can be moved to the nozzle passage 231 of (230). At this time, the upper diameter of the nozzle passage 231 is formed to be smaller than the lower diameter of the nozzle passage 231, so the flow rate of the fluid increases, and the high pressure water flows from the nozzle 230. Can be sprayed.

The brush unit 300 is coupled to the nozzle 230 and rotates in the same direction as the nozzle 230 rotates to remove attachments formed on the net. It is detachably coupled to the fixing plate 310 and can be replaced. It may include a brush plate 320 that can be used.

The fixing plate 310 is formed in a circular plate shape, and the midpoint of the fixing plate 310 may be formed at a position corresponding to the nozzle hole of the housing 100, and the fixing plate 310 is coupled to the outer surface of the plurality of nozzles 230. and can be fixed to the nozzle 230.

The brush plate 320 can be detachably coupled to the fixing plate 310. As a result, when the brush plate 320 and the fixing plate 310 are combined, the nozzle 230 is rotated by the flow of high-pressure water, and the nozzle 230 is rotated. The fixing plate 310 is rotated by the rotation of the fixing plate 310, and the brush plate 320 coupled to the fixing plate 310 is rotated by the rotation of the nozzle 230, so that the brush 321 is located on the brush plate 320. By rotating in contact with the net, contaminants and attachments formed on the net can be easily removed.

As shown in Figure 3, when the brush 321 becomes worn through frequent use and is bent or broken, the brush plate 320 can be replaced by separating the brush plate 320 and the fixing plate 310. By replacing the brush 321, the contact area between the net and the brush 321 can be further increased, making it possible to more easily remove attachments and contaminants located on the net.

The brush 321 may be formed of double bristles each having a different length, with the first bristles being long and the second bristles being shorter than the first bristles by a predetermined distance. Due to this, the concave and convex parts of the irregularities formed on the surface of the rope net can be washed at the same time, and by washing the front of the net and the sides at the same time, attachments and contaminants formed on the sides of the net can be easily removed.

The brush portion 300 is formed so that at least a portion of the brush portion protrudes outside the housing 100 so that the brush portion 300 is rotated in direct contact with the net without being disturbed by the housing 100 and is formed on the net by rotational force. Attachments can be removed.

As a result, the contact area between the net and the brush 321 is increased to physically rotate and remove attachments and contaminants that have not been removed by the high-pressure water sprayed from the nozzle 230, making it possible to easily remove contaminants formed on the net. there is.

The water jet and brush 321 rotate simultaneously and physically clean the net, making it possible to easily remove attachments and contaminants located on the net.

The monitoring unit 600 is coupled to the inner surface of the housing 100 and can monitor attachments attached to the net. The monitoring unit 600 is coupled to the inner surface of the housing 100 and takes pictures of attachments attached to the net. It is coupled to the side of the underwater camera 610 and the housing 100, is located adjacent to the camera, and may include a light 620 that irradiates light to the net.

The underwater camera 610 photographs cleaning objects and foreign substances, transmits the captured images to the control unit, and transmits the image information captured through the covered wire to electronic devices such as cell phones, laptops, and tablet devices to external users who are not underwater. You can check cleaning objects and foreign substances through electronic devices.

The lighting 620 is located on the inner side of the housing 100 and can secure visibility by irradiating light to the outside of the housing 100. Lighting 620 may be made of LED and may be waterproof.

The control unit may be located on the inner side of the housing 100. The control unit can control the hydraulic pump and the nozzle tip 240, and receive information from the monitoring unit 600. The control unit operates the hydraulic pump to The net can be washed by forming high-pressure water in the nozzle part and spraying the high-pressure water through the nozzle passage 231 or the nozzle tip 240.

The control unit can transmit image information transmitted from the monitoring unit 600 to the electronic device through the covered wire. As a result, the user can check the degree of contamination of the net and then clean the net by changing the strength of the hydraulic pump or the type of the nozzle tip 240.

The rotary net cleaning method includes (a) the monitoring unit 600 monitoring attachments and contaminants attached to the net, (b) spraying high-pressure water from the nozzle unit, (c) high-pressure water spraying from the nozzle unit. A step of rotating the nozzle part by the flow, (d) a step of rotating the brush 321 in the same direction as the nozzle part by rotation of the nozzle part, and (e) rotation of the high-pressure water sprayed from the nozzle part and the brush 321. It may include the step of washing the net.

In step (a), the monitoring unit 600 monitors the attachments and contaminants attached to the net, the underwater camera 610 of the monitoring unit 600 captures the attachments and contaminants attached to the net. Fouling and contaminants can be monitored.

After step (a) is performed, step (b), in which high-pressure water is sprayed from the nozzle unit, may be performed. In step (b), the control unit operates the hydraulic pump, and the hydraulic pump can suck in adjacent fluid and pump it into the supply passage 211 of the supply pipe 210.

The fluid remaining in the supply passage 211 may be moved to the nozzle passage 231 of the nozzle 230. At this time, the upper diameter of the nozzle passage 231 is formed to be larger than the lower diameter of the nozzle passage 231, thereby increasing the flow rate of the fluid. This increases so that high-pressure water can be sprayed from the nozzle 230.

After step (b) is performed, step (c), in which the nozzle unit is rotated by the flow of high-pressure water sprayed from the nozzle unit, may be performed. In step (c), the supply pipe 210 is combined with the rotary joint 220 and the nozzle 230 is provided with a rotational force by high-pressure water sprayed in different directions from the plurality of nozzles 230. ) is coupled with the supply pipe 210 is rotated by the rotary joint 220, so that the supply pipe 210 and the nozzle 230 can be easily rotated by transmitting rotational force.

After step (c) is performed, step (d) may be performed in which the brush 321 is rotated in the same direction as the nozzle portion by rotating the nozzle portion, and in step (d), the fixing plate 310 is rotated in the nozzle portion. When combined with 230 and the nozzle 230 is rotated by high-pressure water and the rotary joint 220, the nozzle 230 can be rotated in the same direction as the rotation direction.

As a result, the brush plate 320 coupled to the fixing plate 310 is rotated in the same direction as the fixing plate 310 in which the nozzle 230 is rotated, so that the brush 321 formed on the brush plate 320 is in contact with the net. It can be rotated.

After step (d) is performed, the step (e) is a step of washing the net by rotating the brush 321 and high-pressure water sprayed from the nozzle part. In step (e), the net is cleaned from the nozzle part. The sprayed high-pressure water can remove contaminants and deposits formed on the surface of the net by spraying high-pressure water on the surface of the net.

The nozzle part rotates and sprays high-pressure water to clean the surface area of the net over a wide area. In the case of nets with interstitial spaces, the high-pressure water sprayed from the nozzle 230 passes through the interspaces of the net and cannot be cleaned. The brush 321 can be rotated in contact with the net to physically remove contaminants and attachments formed on the net.

Due to this, the water jet and the brush 321 rotate simultaneously and physically clean the net, making it possible to easily remove attachments and contaminants located on the net.

The description of the present invention described above is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as unitary may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the patent claims described below, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

100: housing
210: supply pipe
211: Supply channel
220: rotation joint
230: nozzle
231: Nozzle flow path
240: nozzle tip
300: Brush part
310: fixing plate
320: Brush plate
321: brush
400: fixing part
600: Monitoring unit
610: Underwater camera
620: lighting

Claims (11)

A housing in which an internal space is formed;
a nozzle unit coupled to the inside of the housing and spraying high-pressure water; and
A brush coupled to the nozzle portion and at least a portion of the brush exposed to the outside of the housing,
A rotating net cleaning device, wherein the brush is rotated in the same direction as the nozzle part by the flow of the high-pressure water sprayed from the nozzle part and cleans the net.
In claim 1,
The nozzle part,
A supply pipe coupled to the housing and through which high-pressure water moves;
A nozzle coupled to the supply pipe and through which high-pressure water is sprayed; and
A rotary net cleaning device comprising a rotary joint that is coupled to the supply pipe and transmits rotational force to the supply pipe and the nozzle.
In claim 2,
The nozzle part,
A hydraulic pump connected to the supply pipe and spraying the high-pressure water to the outside of the nozzle.
In claim 2,
A rotary net cleaning device, characterized in that at least one nozzle is formed.
In claim 2,
The nozzle is,
A rotary net cleaning device comprising a nozzle tip that is coupled to the nozzle and controls the amount of high-pressure water sprayed from the nozzle.
In claim 1,
A rotary net cleaning device, characterized in that the brush is separated from or combined with the nozzle portion.
In claim 1,
The housing is,
A rotating net cleaning device further comprising a monitoring unit coupled to the housing and monitoring attachments attached to the net.
In claim 7,
The monitoring unit,
An underwater camera coupled to the inner side of the housing and taking pictures of attachments attached to the net; and
A rotating net cleaning device comprising: a light coupled to the inner side of the housing, positioned adjacent to the camera, and emitting light to the net.
In claim 3,
The housing is,
A rotary net cleaning device further comprising a control unit coupled to the inside of the housing and controlling the hydraulic pump.
In the rotary net cleaning method using the rotary net cleaning device according to any one of claims 1 to 9,
The monitoring unit monitors attachments and contaminants attached to the net;
spraying the high-pressure water from the nozzle unit;
Rotating the nozzle unit by the flow of the high-pressure water sprayed from the nozzle unit;
Rotating the brush in the same direction as the nozzle unit by rotating the nozzle unit; and
A rotary net cleaning method comprising: cleaning the net by using high-pressure water sprayed from the nozzle unit and rotation of the brush.
In claim 10,
The step of rotating the brush in the same direction as the nozzle unit,
A rotary net cleaning method, wherein the brush is coupled to the nozzle unit and the brush is rotated in the same direction in which the nozzle unit is rotated.

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