WO2016152449A1

WO2016152449A1 - Brush for cleaning sunlight reflecting mirror, and cleaning system, cleaning method and cleaning apparatus for sunlight reflecting mirror

Info

Publication number: WO2016152449A1
Application number: PCT/JP2016/056700
Authority: WO
Inventors: 工藤　一良; 篤志齋藤
Original assignee: コニカミノルタ株式会社
Priority date: 2015-03-20
Filing date: 2016-03-04
Publication date: 2016-09-29
Also published as: JP2018078913A

Abstract

The objective of the present invention is to provide a brush for cleaning a sunlight reflecting mirror, which is capable of uniformly cleaning a sunlight reflecting mirror with high cleaning power without damaging the sunlight reflecting mirror. This brush for cleaning a sunlight reflecting mirror cleans a mirror surface of a sunlight reflecting mirror by coming into contact with the mirror surface and rotating thereon. This brush for cleaning a sunlight reflecting mirror is characterized by comprising a rotatable brush substrate and a plurality of brush bristles that are provided on the brush substrate and rotate as the brush substrate rotates. This brush for cleaning a sunlight reflecting mirror is also characterized by comprising a distance adjustment mechanism and an angle adjustment mechanism for respectively adjusting the distance and the angle between the mirror surface and the brush bristles.

Description

Solar reflective mirror cleaning brush, solar reflective mirror cleaning system, cleaning method and cleaning device

The present invention relates to a solar reflective mirror cleaning brush, a solar reflective mirror cleaning system, a cleaning method, and a cleaning device. More specifically, the present invention relates to a solar reflective mirror cleaning brush and the like that can be uniformly cleaned with high cleaning power without damaging the solar reflective mirror.

Known solar power generation devices include solar cells that directly convert sunlight into electric power, solar thermal power generation devices that use sunlight reflecting mirrors to collect sunlight and generate the resulting heat as a medium. It has been.
Since the solar thermal power generation device can store heat, it can generate power regardless of day or night. From a long-term viewpoint, the power generation efficiency of the solar thermal power generation device is higher than that of the solar cell, and sunlight can be used effectively.

Solar thermal power generation devices are often used in desert areas, and dirt such as dust tends to adhere to the sunlight reflecting mirrors installed outdoors.
In particular, dirt derived from dust in a desert area is different from ordinary dirt, and forms a strong sand film and is easily fixed to the mirror surface of the sunlight reflecting mirror. This is thought to be one of the causes of condensation on the surface in a desert area where the temperature difference between day and night is large. When condensation occurs on the surface, dust-derived substances accumulated on the surface (for example, NaCl, CaCO ₃ , SiO _2, etc.), pollutants in the atmosphere (for example, SiO _x, etc.) dissolve in the condensation and react. Insoluble salts are formed. Thereafter, the water evaporates and insoluble salts and dust particles aggregate to form a strong sand film.

Since such dirt lowers the reflectivity and thus the power generation efficiency, a solar reflection mirror having an excellent surface antifouling property has been proposed. For example, a solar reflective mirror that includes a layer containing a photocatalyst on the outermost surface of the solar reflective mirror and decomposes the attached organic matter has been proposed (see, for example, Patent Document 1). In addition, a solar reflective mirror is also proposed in which a hydrophilic layer containing a hydrophilic polymer, a metal alkoxide compound, and colloidal silica is provided on the surface of the solar reflective mirror and can be easily cleaned (see, for example, Patent Document 2). ).

In addition to the antifouling property of the surface, a cleaning method for increasing the cleanliness of the surface has been studied.
For example, there has been proposed a method of easily cleaning dirt adhered using a nanobubble without damaging the surface (see, for example, Patent Document 3).

However, since the degradation rate of dirt by the photocatalyst is slower than the speed at which a sand film is formed, dirt is still deposited on the surface in a harsh environment such as outdoors.
In addition, according to the hydrophilic layer, when there is rain, the water gets wet and the dirt is washed away from the surface, but in the desert area where there is little rain, such self-cleaning action cannot be expected, and regular cleaning work is still necessary It is.

Thus, in a harsh outdoor environment such as a desert, it was not possible to sufficiently prevent the accumulation of dirt simply by providing antifouling properties. Even when a cleaning method having a high cleaning effect such as nanobubbles is used, in order to maintain a high reflectance, it is necessary to frequently perform a cleaning operation, and the cleaning load has not changed much.

Therefore, in order to remove the dirt, it is conceivable to wipe off with a brush or the like.

International Publication No. 2011/0778024 JP 2012-8166 A JP 2013-139958 A

The present invention has been made in view of the above-described problems and situations, and the problem to be solved is a solar reflective mirror cleaning brush that can be cleaned uniformly with high cleaning power without damaging the solar reflective mirror, the sun To provide a cleaning system, a cleaning method, and a cleaning apparatus for a light reflecting mirror.

In order to solve the above problems, the present inventor has a distance adjustment mechanism and an angle adjustment mechanism in the process of examining the cause of the above problem, etc., so that the distance and angle between the mirror surface and the brush hair can be adjusted, It has been found that the angle between the brush hair and the mirror surface, the deterioration state of the brush hair, and the unevenness of the road surface are not affected, and the solar reflective mirror can be washed uniformly without damaging it. The present invention has been reached.
That is, the said subject which concerns on this invention is solved by the following means.

1. A brush for cleaning a sunlight reflecting mirror that cleans the mirror surface by rotating in contact with the mirror surface of the sunlight reflecting mirror,
A rotatable brush substrate;
A plurality of brush bristles provided on the brush substrate and rotating with the rotation of the brush substrate; and
A brush for cleaning a sunlight reflecting mirror, comprising a distance adjusting mechanism and an angle adjusting mechanism for adjusting a distance and an angle between the mirror surface and the brush bristles.

2. 2. The solar reflective mirror cleaning brush according to claim 1, wherein the distance adjusting mechanism or the angle adjusting mechanism is an urging mechanism.

3. 3. The solar reflective mirror cleaning brush according to claim 2, wherein the urging mechanism is at least one selected from a spring, rubber, a balloon, and a damper.

4. The distance adjusting mechanism or the angle adjusting mechanism is located between the brush substrate and the brush bristles, for cleaning a solar reflective mirror according to any one of claims 1 to 3. brush.

5. The distance adjustment mechanism or the angle adjustment mechanism is provided on a surface of the brush substrate opposite to the brush bristles, according to any one of the first to fourth items. Brush for cleaning sunlight reflecting mirrors.

6. 6. The solar reflective mirror cleaning brush according to any one of items 1 to 5, wherein an average diameter of the plurality of brush bristles is in a range of 1 μm to 1 mm.

7. The brush for solar reflective mirror cleaning according to any one of claims 1 to 6, wherein the plurality of brush bristles are hydrophilic fiber bristles.

8). The solar reflective mirror cleaning brush according to any one of items 1 to 7,
And a means for rotating the solar reflective mirror cleaning brush in contact with the mirror surface of the solar reflective mirror.

9. 9. The solar reflective mirror cleaning system according to item 8, wherein the solar reflective mirror is a film mirror type.

10. A method for cleaning a solar reflective mirror, wherein the mirror surface of the solar reflective mirror is cleaned with a brush,
The plurality of brush hairs and sunlight reflection while rotating the solar reflective mirror cleaning brush according to any one of items 1 to 7 in contact with a mirror surface of the solar reflective mirror A method for cleaning a solar reflective mirror, wherein the mirror surface is cleaned by adjusting a distance and an angle with the mirror.

11. The method for cleaning a sunlight reflecting mirror according to item 10, wherein the sunlight reflecting mirror is a film mirror type.

12. A solar reflective mirror cleaning apparatus comprising the solar reflective mirror cleaning brush according to any one of items 1 to 7.

13. 13. The solar reflective mirror cleaning apparatus according to item 12, wherein the solar reflective mirror is a film mirror type.

The solar reflection mirror cleaning brush, the solar reflection mirror cleaning system, the cleaning method, and the cleaning device that can be uniformly cleaned with high cleaning power without damaging the solar reflection mirror by the above-described means of the present invention. Can be provided.
The expression mechanism or action mechanism of the effect of the present invention is not clear, but is presumed as follows.

In a general cleaning brush, a bristle having a wire diameter of about 0.7 to 1.3 mmφ is implanted in a brush substrate with a length of about 300 to 500 mm.
In a conventional solar reflective mirror cleaning apparatus, such a brush is mounted on a cleaning vehicle via a robot arm, and the entire brush arm is pushed to remove the brush hair from the surface of the solar reflective mirror (hereinafter referred to as “mirror”). Cleaning is performed by applying a shearing force to the mirror surface by the brush bristles by rotating the brush substrate in contact with the surface.

However, in such a cleaning method, the distance between the robot arm and the mirror surface changes due to the unevenness of the road surface.
In the conventional brush, when the distance is small, the brush bristles are pushed more strongly against the mirror surface and thus spread.
On the other hand, when the distance is large, the bristle is not pushed strongly against the mirror surface, and therefore the spread of the bristle becomes small. As a result, since the cleaning area is reduced, there is a problem that the cleaning power is reduced and the reflectance is reduced.

In addition, since the entire robot arm is pushed in, the conventional cleaning method using a brush cannot individually adjust the contact state (that is, distance, angle, etc.) between the brush hair and the mirror surface for each brush. For this reason, when using brushes with different deterioration states at the same time, such as when using a new brush and an old brush, there is a problem in that defective cleaning tends to occur partially and the mirror surface cannot be cleaned uniformly.

Further, the conventional brush may cause scratches on the mirror surface when it is cleaned while moving the position of the brush in contact with the mirror surface at a speed greater than 1.0 km / h in the lateral direction of the sunlight reflecting mirror. It was.

Furthermore, when cleaning a parabolic trough solar reflecting mirror, the angle and distance between the brush bristles and the mirror surface against which the bristles come into contact depends on the position of the brush because of the parabolic shape (parabolic concave surface). Different. For this reason, it was difficult to press the bristles uniformly against the mirror surface for cleaning, and it was further found that the solar reflective mirror might be damaged.

Therefore, the present inventors introduce a mechanism for adjusting the distance and angle between the brush bristles and the mirror surface against which the bristles come into contact with the solar reflective mirror cleaning brush (hereinafter also simply referred to as “brush”). Thus, the distance and the contact angle can be adjusted for each brush.
As a result, the change in the distance between the brush bristles and the mirror surface can be reduced, so even if the distance between the mirror surface and the robot arm changes due to the unevenness of the road surface, it is not affected by it, and the entire mirror surface is highly clean. It has been found that a brush that can be cleaned uniformly can be provided.

Such a brush of the present invention has the following effects.

Even if the deterioration state of the cleaning brush is different, the contact state can be adjusted for each brush. Therefore, it is possible to use a new brush and an old brush in combination, and it is not affected by the difference in the deterioration state of the brush hair. As a result, the life of the bristles (the usable period) can be extended.
Furthermore, even when cleaning parabolic trough solar reflective mirrors, the angle can be adjusted for each brush, so it is not affected by changes in the angle between the brush bristles and the mirror surface as the brush rotates, and is uniform with high cleaning power. Can be cleaned.

In addition, even when cleaning parabolic trough sunlight reflecting mirrors, the brush bristles can be uniformly pressed against the mirror surface for cleaning regardless of the position of the brush mounted on the robot arm. It is possible to clean evenly with cleaning power.

Further, since the brush bristles are suitably spread, the contact area with the mirror surface is increased, so that it is possible to suppress a large force from being applied to a part, and as a result, it is possible to suppress damage to the mirror.
For this reason, since the position of the brush contacting the mirror surface can be cleaned while moving in the horizontal direction at a speed greater than 1.0 km / h, it is efficient.

Moreover, the reflectance of a solar reflective mirror can be kept favorable by using the brush for washing | cleaning such a solar mirror of this invention. As a result, the solar thermal power generation apparatus having the solar reflective mirror that is cleaned by the brush of the present invention maintains good reflectivity, so that the amount of power generation increases and, consequently, the power generation cost decreases.
Moreover, since the lifetime of a brush improves and it can wash | clean uniformly with high detergency, the usage-amount of washing | cleaning liquids, such as water, reduces, and it can reduce the maintenance cost of a solar thermal power generation apparatus, and is preferable.

The bottom view which shows the brush for sunlight reflection mirror washing | cleaning which concerns on this Embodiment from the hair-tip side of a brush hair Partial sectional view taken along line XX in FIG. Partial cross-sectional view showing the brush hair planting part Side schematic diagram showing an example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Side schematic diagram showing another example of a brush having a distance adjustment mechanism and an angle adjustment mechanism Sectional drawing which shows schematic structure of a sunlight reflecting mirror of a film mirror type Sectional drawing which shows schematic structure of a glass mirror type sunlight reflective mirror The perspective view which shows the cleaning apparatus of the sunlight reflection mirror which concerns on this Embodiment Side schematic diagram showing an example of a general brush that does not have a distance adjustment mechanism and an angle adjustment mechanism

The solar reflective mirror cleaning brush of the present invention is a solar reflective mirror cleaning brush for cleaning the mirror surface by rotating in contact with the mirror surface of the solar reflective mirror, and a rotatable brush substrate And a plurality of brush bristles provided on the brush substrate and rotating as the brush substrate rotates, and a distance for adjusting a distance and an angle between the mirror surface and the brush bristles An adjustment mechanism and an angle adjustment mechanism are provided. This feature is a technical feature common to the inventions according to claims 1 to 13.

In the present invention, it is preferable that the distance adjusting mechanism or the angle adjusting mechanism is an urging mechanism because the effect can be suitably expressed. Specifically, at least one selected from a spring, rubber, balloon and damper is preferable.

In the present invention, the distance adjustment mechanism or the angle adjustment mechanism can be more precisely adjusted in distance and angle so that the distance and angle are between the brush substrate and the brush bristles. It is preferable because it can be expressed.

In the present invention, it is preferable that the distance adjusting mechanism or the angle adjusting mechanism is provided on the surface of the brush substrate on the side opposite to the brush bristles because the effect can be suitably exhibited.

It is preferable that the average diameter of the plurality of brush bristles is in the range of 1 μm to 1 mm because high detergency can be obtained without damaging the mirror surface.

In the present invention, it is preferable that the plurality of brush hairs are made of hydrophilic fiber hairs because they can be highly washed without damaging the mirror surface.

The solar reflective mirror cleaning brush of the present invention can be suitably used in a solar reflective mirror cleaning system having means for rotating the solar reflective mirror in contact with the mirror surface of the solar reflective mirror.

The brush for cleaning the solar reflective mirror of the present invention adjusts the distance and angle between the plurality of brush hairs and the solar reflective mirror while rotating the brush in contact with the mirror surface of the solar reflective mirror. Thus, it can be suitably employed in a method for cleaning a sunlight reflecting mirror that cleans the mirror surface.

The solar reflective mirror cleaning brush of the present invention can be suitably used in a solar reflective mirror cleaning device.

In addition, the solar reflective mirror cleaning system, the solar reflective mirror cleaning method, and the solar reflective mirror cleaning apparatus employing the solar reflective mirror cleaning brush of the present invention are suitable for a film mirror type solar reflective mirror. Applicable to.

Hereinafter, the present invention, its components, and modes for carrying out the present invention will be described in detail.
In the present application, “˜” is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.

≪Sunlight reflection mirror cleaning brush≫
FIG. 1 is a bottom view of the solar reflective mirror cleaning brush 10 of the present embodiment.
FIG. 2 is a partial sectional view taken along line XX of FIG.
As shown in FIGS. 1 and 2, the solar reflective mirror cleaning brush 10 includes a rotatable brush substrate 1 and an attachment device 4 provided on the brush substrate 1.
The attachment device 4 may be integrally formed of the same material as the brush substrate 1 as in the example of FIG. 5 described later, but the distance adjustment mechanism and the angle adjustment mechanism 41 as in the example of FIG. It may be provided on the brush substrate 1 via other members.
The attachment device 4 includes a plurality of brush bristles 2 that rotate as the brush substrate 1 rotates.
The solar reflective mirror cleaning brush of the present invention can clean the mirror surface by rotating in contact with the mirror surface of the solar reflective mirror.

[Brush substrate]
The brush substrate 1 is formed in a circular shape as shown in FIG. 1, and a circular hole 11 for attaching a shaft is provided at the rotation center C of the brush substrate 1 as shown in FIG.
In the brush substrate, when a distance adjustment mechanism and an angle adjustment mechanism are provided on the surface opposite to the brush bristles, a compression coil spring or a damper, which will be described later, is attached to the circular hole 11, and the compression coil spring or A shaft may be attached to the damper.

The material of the brush substrate 1 is not particularly limited, and can be formed of wood, metal, hard synthetic resin, or the like. If it is lightweight and sufficient strength can be obtained, it can be used without particular limitation. Examples of synthetic resins that can be used include vinyl chloride resin, polypropylene resin, ABS resin (acrylonitrile butadiene styrene resin) and the like.

[Brush hair]
As shown in FIG. 1, the plurality of brush bristles 2 may be provided not only on the entire surface of the brush substrate 1 but also on the entire surface via the attachment device 4.

In the case where the plurality of brush hairs 2 are set as the aggregate G, and the plurality of aggregates G are arranged on the brush substrate 1 via an attachment device, the brush hair 2 is improved from the viewpoint of improving rotational stability, cleaning uniformity, and the like. The plurality of aggregates G are preferably arranged at regular intervals in the rotation direction of the bristles 2 as in the arrangement pattern shown in FIG.

The plurality of brush bristles 2 may be individually planted on the attachment device 4 or may be planted as a bunch of hair bundled with a plurality of brush bristles 2. When bristles are used, it is preferable because the bristle 2 having high elasticity and hardly falls down can be obtained, and stress necessary for cleaning can be easily transmitted to the mirror surface.

FIG. 3 shows a planting portion of the attachment device 4 in which a plurality of brush bristles 2 are planted as a hair bundle 21.
As shown in FIG. 3, the bristle bundle 21 has a plurality of brush bristles 2 bent at the center in the length direction, and a stopper 22 is wound around the bent portion and bundled. The hair bundle 21 is planted by pushing the bent portion into the planting hole 13 provided in the attachment device 4. When pushed, the stopper 22 of the hair bundle 21 bites into the attachment device 4, and the hair bundle 21 is fixed to the attachment device 4. The stopper 22 is preferably made of a metal such as stainless steel from the viewpoint of firmly fixing the hair bundle 21 and preventing deterioration due to rust or the like.
When the bristle 2 is provided on the brush substrate 1 through the mounting tool 4 as described above, the worn bristle 2 in units of the mounting tool 4 can be replaced.

Also, the vicinity of the base of the brush hair 2 can be bundled with a band. Thereby, the bristle 2 which has high elasticity and is hard to fall down can be obtained, and the cleaning power can be increased.

When the bristle bundle 21 is provided on the brush substrate 1 by the attachment device 4, as shown in FIG. 2, by providing a distance adjustment mechanism and an angle adjustment mechanism 41 between the attachment device 4 and the brush substrate 1, the mirror surface It is good also as adjusting the distance and angle of the brush hair 2.

(Average brush hair diameter)
The plurality of brush bristles 2 preferably have a wire diameter in the range of 1 μm to 1 mm in both monofilament and multifilament. Within this range, high cleaning power can be obtained without damaging the mirror surface.
The average diameter of the brush bristles 2 can be measured by observing with a digital microscope VH-5500 (manufactured by KEYENCE). Generally, since the thickness of the fiber varies depending on the location, the average value of the measured values obtained by measuring the measurement position arbitrarily, for example, at 500 locations, may be used as the average diameter of the brush bristles 2.

The plurality of brush bristles 2 preferably exhibit hydrophilicity when using water or a cleaning liquid containing water as a main component (hereinafter also simply referred to as “cleaning liquid”). The brush bristles 2 exhibiting hydrophilicity can wet and spread the supplied water or a cleaning liquid containing water as a main component on the surface of the brush bristles 2. When the brush bristles 2 come into contact with the mirror surface of the sunlight reflecting mirror, dirt on the mirror surface can be effectively removed by the cleaning liquid wet on the surface of the brush bristles 2, and the cleaning power is increased.

The hydrophilicity of the brush bristles 2 can be evaluated by an official moisture content measured in accordance with JIS L0105 4.1.
When the hydrophilicity of the bristle 2 is evaluated by the official moisture content, the official moisture content measured in the standard state (temperature 20 ± 2 ° C., relative humidity 65 ± 4%) in accordance with JIS L0105 is 1% or more. High detergency can be obtained.

The hydrophilicity of the brush bristles 2 can also be evaluated by measuring the contact angle of a film or sheet-like sample produced using the material of the bristles 2 with respect to water. Specifically, in accordance with JIS-R3257, 3 μL of water was dropped on a film or sheet sample in an environment of a temperature of 23 ° C. and a relative humidity of 55% RH, and a contact angle meter DM- after 30 seconds. 300 (manufactured by Kyowa Interface Science Co., Ltd.) can be used for measurement. It shows that hydrophilic property is so high that the measured contact angle is small.
When the hydrophilicity of the brush bristles 2 is evaluated based on the contact angle with water, a high detergency can be obtained when the contact angle measured by the measurement method is 70 ° or less.

As the bristle 2 exhibiting hydrophilicity, hydrophilic fiber hair can be used.
As long as it has hydrophilicity, the fiber hair which has a hydrophilic group may be used, and the fiber hair which has a hydrophilic surface layer by hydrophilic treatment can also be used. Examples of the hydrophilic group include a hydroxy group, an amino group, an amide group, a carboxy group, and an ether group that can form a hydrogen bond with a water molecule, and two or more of these groups can be combined.

Moreover, it is preferable that the bristle 2 has a water absorptivity, and as the bristle 2 which shows water absorptivity, the fiber hair which has a water absorptivity can be used. The fiber bristles having water absorption can once absorb the supplied cleaning liquid and supply the cleaning liquid absorbed during the cleaning onto the mirror surface.
Having water absorption means that the water absorption obtained by the following formula is 0.25% or more in accordance with (Method A) of JIS K 7209.
Water absorption (%) = (W2−W1) / W1 × 100
In the above formula, W1 represents the mass (mg) of the dried fiber hair sample before being immersed in water, and W2 is the mass of the fiber hair sample after being immersed in water at a temperature of 23 ± 1 ° C. for 23 to 24 hours. (Mg).

Examples of the fiber hair having hydrophilicity and water absorption include animal fiber hair, plant fiber hair, chemical fiber hair, and the like, and a plurality of types of fiber hair can be used in combination. Animal fibers or chemical fibers are preferable from the viewpoint of durability, and chemical fibers are preferable from the viewpoint of quality stability.
The animal fiber hair is not particularly limited, and examples thereof include horse hair and pig hair.
Although there is no restriction | limiting in particular as vegetable fiber hair, Fiber hairs, such as cotton, hemp, and palm, are mentioned.

As synthetic fiber hair, synthetic fiber hair made of, for example, polyvinylon, polyvinyl chloride (PVC), polypropylene (PP), etc., polyester (polyethylene (PE), polyethylene terephthalate, etc.), nylon (polyamide), acrylic, etc. And semi-synthetic fiber hairs made from cellulose, cellulose ester and the like. Among these, nylon such as nylon 6 and nylon 66 (manufactured by Toray Industries, Inc.) is preferable. Nylon has moderate hygroscopicity derived from amide bonds, easy to orient molecular chains consisting of long-chain fatty acids of moderate length on the fiber axis, relatively good stretchability, high heat of fusion and high heat capacity. It has preferable properties as a material for the brush hair 2 such as melting resistance that is difficult to melt both kinetically and kinetically and flexibility of a molecular chain composed of a long chain fatty acid. In addition, the properties of nylon such as repetitive bending and elongation, such as the property of being difficult to fibrillate and forming a king band due to the formation of hydrogen bonds between amide bonds, can be used as the brush bristles 2.

[Distance adjustment mechanism and angle adjustment mechanism]
The distance adjustment mechanism and the angle adjustment mechanism are mechanisms for adjusting the distance and angle between the mirror surface and the brush bristles.
The distance adjustment mechanism and the angle adjustment mechanism 41 of the present invention urges the plurality of brush bristles 2 that rotate with the rotation of the brush substrate to press the mirror surface when cleaning the mirror surface. And the distance and angle between the brush bristles 2 are adjusted.
Thereby, the bristle 2 can be urged | biased and pressed on a mirror surface at least per brush.
Furthermore, by providing a distance adjusting mechanism or an angle adjusting mechanism between the brush substrate and the brush bristles 2, the bristles 2 can be urged and pressed to the mirror surface in finer units.
Specifically, for example, by providing a distance adjustment mechanism or an angle adjustment mechanism between the brush substrate 1 and the attachment device 4, the brush bristles 2 can be urged and pressed against the mirror surface for each attachment device 4. .

By having the distance adjusting mechanism and the angle adjusting mechanism 41 according to the present invention as described above, the brush bristles 2 can be pushed more strongly against the mirror surface and expanded in units of brushes or less. As a result, the cleaning area of the brush is not affected by the presence or absence of unevenness on the road surface or the position where it is mounted on the robot arm, and it can be cleaned uniformly with high cleaning power.

As described above, the position of the distance adjusting mechanism or the angle adjusting mechanism provided in the brush of the present invention is not particularly limited as long as the effect expression is not hindered. For example, in the brush substrate 1, the position opposite to the brush bristles 2 is used. Although it may be provided on the surface, it is preferably between the brush substrate 1 and the brush bristles 2.

The distance adjusting mechanism and the angle adjusting mechanism 41 are not particularly limited as long as the adjustment can be performed, but it is preferable to be an urging mechanism that urges the brush.

<Burning mechanism>
Such an urging mechanism is not particularly limited, but is a mechanism that uses at least one urging member selected from a spring, rubber, a balloon, and a damper, and urges the bristles 2 during cleaning. May be.

Known springs can be used, and examples thereof include a compression coil spring, a leaf spring, and a torsion spring.

As the damper, a known device such as a device having an elastic body that reduces impact and vibration can be used. For example, a pneumatic spring, a hydraulic spring, a gas spring having nitrogen gas, or the like can be suitably employed.

As the rubber, a known rubber can be used, and the shape is not particularly limited as long as it can bias the plurality of brush bristles 2 against the mirror surface. It may be.

The distance adjusting mechanism and the angle adjusting mechanism 41 according to the present invention may be used by using one type of the urging member, or the distance adjusting mechanism and the angle adjusting mechanism 41 may be combined with two or more types.

Hereinafter, specific examples of the distance adjustment mechanism and the angle adjustment mechanism 41 will be described with reference to FIGS.

4 to 6 are examples of brushes in which the brush bristles 2 are provided on the entire surface of the brush substrate 1. FIG.

In FIG. 4, a plurality of compression coil springs that can expand and contract in the direction of the rotation axis of the brush substrate 1 are provided between the attachment device 4 and the brush substrate 1 (that is, between the brush substrate 1 and the brush bristles 2). It is an example of a brush. The attachment device 4 is attached to the brush substrate 1 through the compression coil spring so as to reciprocate in the rotation axis direction of the brush substrate 1.
In this example, the compression coil spring is the distance adjustment mechanism and the angle adjustment mechanism 41. Specifically, when the compression coil spring expands and contracts in the direction of the rotation axis of the brush substrate 1, the brush bristles 2 are urged and pressed against the mirror surface via the attachment device 4, and the mirror surface and the bristles 2 are pressed. And adjust the distance and angle.
In the figure,

reference numerals

101 and 1015 denote a rotation driving unit 101 and an arm substrate 1015, which will be described later.

FIG. 5 is an example of a brush in which one compression coil spring used in FIG. 4 is provided on the surface of the brush substrate 1 opposite to the brush bristles 2.
The brush substrate 1 is attached to a cleaning device (a substrate included in a cleaning device described later in the illustrated example) through the compression coil spring so as to reciprocate in the direction of the rotation axis of the brush substrate 1.
In the example of FIG. 5, the compression coil spring is the distance adjustment mechanism and the angle adjustment mechanism 41. Specifically, when the compression coil spring expands and contracts in the direction of the rotation axis, the brush bristles 2 are urged and pressed against the mirror surface via the brush substrate 1, and the distance between the mirror surface and the brush bristles 2 is Adjust the angle.

FIG. 6 shows that the compression coil spring used in FIG. 4 can be expanded and contracted in the direction of the rotation axis of the brush substrate 1, and a plurality of attachment devices 4 and the brush substrate 1 are opposite to the brush bristles 2 in the brush substrate 1. It is an example of the brush provided one by the side surface.
In the example shown in FIG. 6, the attachment device 4 is attached to the brush substrate 1 through the compression coil spring so as to reciprocate in the rotation axis direction of the brush substrate 1.
The brush substrate 1 is attached to a cleaning device (a substrate included in a cleaning device described later in the illustrated example) through the compression coil spring so as to reciprocate in the rotation axis direction of the brush substrate 1.

7 to 9 are examples of a brush having four aggregates G of brush bristles 2 as shown in FIG.

FIG. 7 is an example of a brush in which a plurality of compression coil springs similar to those in FIG. 4 are provided between each attachment device 4 and the brush substrate 1. Each attachment device 4 is attached to the brush substrate 1 through the compression coil spring so as to reciprocate in the rotation axis direction of the brush substrate 1.
In this example, the compression coil spring is the distance adjustment mechanism and the angle adjustment mechanism 41. Specifically, a compression coil spring provided in each attachment device 4 expands and contracts in the direction of the rotation axis of the brush substrate 1. Thereby, the brush hair 2 can be urged | biased and pressed against a mirror surface for every attachment instrument 4, and the distance and angle of a mirror surface and the brush hair 2 can be adjusted.

FIG. 8 is the same as FIG. 5 except that the brush bristles 2 are partially provided, not the entire surface of the brush substrate 1, via the attachment device 4.

FIG. 9 shows that two compression coil springs used in FIG. 4 are provided between each attachment device 4 and the brush substrate 1, one on the surface of the brush substrate 1 opposite to the brush bristles 2. This is an example of a brush.
In the example shown in FIG. 9, the attachment device 4 is attached to the brush substrate 1 through the compression coil spring so as to reciprocate in the rotation axis direction of the brush substrate 1.
The brush substrate 1 is attached to a cleaning device (a substrate included in a cleaning device described later in the illustrated example) through the compression coil spring so as to reciprocate in the rotation axis direction of the brush substrate 1.

Further, as the distance adjustment mechanism and the angle adjustment mechanism 41, a plate spring may be used instead of the compression coil spring. For example, as shown in FIGS. 10 and 11, the attachment device 4 and the brush substrate in FIGS. 1 is changed to a leaf spring which can be elastically deformed in the direction of the arrow with the brush substrate 1 side as a fixed end. It is good also as what adjusts the distance and angle of a mirror surface and the bristle 2 by energizing and pressing.

10 and 11, a hinge with a torsion spring as shown in FIGS. 12 and 13 is provided between the leaf spring and the mounting device 4, and the elasticity of the leaf spring and the elasticity of the torsion spring are provided. The brush bristles 2 may be urged against the mirror surface and pressed to adjust the distance and angle between the mirror surface and the brush bristles 2.
The hinge with a torsion spring fixes the attachment device 4 at an arbitrary angle by a hinge when not washed, and urges the brush bristles 2 against the mirror surface by the elastic force of the torsion spring at the time of washing. It is preferable to press.

Further, as shown in FIG. 14, in FIG. 12, the hinge with the torsion spring is changed to only the hinge, and at the time of cleaning, the angle between the mirror surface and the brush bristles 2 is adjusted by the hinge, and the leaf spring The brush bristles 2 may be urged against the mirror surface and pressed to adjust the distance and angle between the mirror surface and the bristles 2.

In the example of FIG. 5 and the like described above, the distance adjustment mechanism and the angle adjustment mechanism 41 provided on the surface of the brush substrate 1 opposite to the brush bristles 2 use compression coil springs. For example, a damper that can bend and stretch in the direction of the rotation axis of the brush substrate 1 may be used.
FIG. 15 shows an example in which a damper is used instead of the compression coil spring in the example shown in FIG.
FIG. 16 is an example in which a hinge as shown in FIG. 14 is further provided in the example shown in FIG.

Also, in the examples of FIGS. 12 and 13, it is possible to use only a torsion spring without using a hinge, as shown in FIGS.

In the example shown in FIGS. 4 to 18, the distance adjusting mechanism and the angle adjusting mechanism 41 urge the brush bristles 2 according to the reaction force from the mirror surface received through the bristles 2 during cleaning. In this manner, the distance and angle between the mirror surface and the brush bristles 2 are adjusted, which is a passive adjustment mechanism, so that the distance adjustment mechanism or the angle adjustment mechanism according to the present invention includes the mirror surface and the brush bristles. It is only necessary that the distance and angle with 2 can be adjusted, and the present invention is not limited to the example shown above. For example, information on the distance and angle with the mirror surface is acquired by a sensor, and the distance and angle are actively adjusted based on the information by energizing the brush bristles 2 and the attachment device 4 with a motor or the like. An aspect may be sufficient.

Moreover, the distance adjustment mechanism and the angle adjustment mechanism 41 are not limited to the installation position as long as the adjustment can be performed, but as shown in the illustrated example, the distance between the brush substrate and the bristles 2 may be less than a brush unit, For example, it is preferable because the distance and angle can be adjusted more precisely with 4 units of fixtures.
In addition, the distance adjusting mechanism and the angle adjusting mechanism 41 may be provided on the surface of the brush substrate 1 opposite to the brush bristles 2 as shown in the illustrated example.

Further, as shown in the illustrated example, a plurality of the distance adjustment mechanism and the angle adjustment mechanism 41 may be provided for one brush, and further, between the brush substrate 1 and the brush bristles 2 and the brush bristles 2. It may be provided on both of the opposite surface.

When a plurality of distance adjustment mechanisms and angle adjustment mechanisms 41 are provided, the means for adjusting the distance and adjusting the angle may be configured to perform the distance adjustment and the angle adjustment by one means. As such a form, for example, the distance and the angle are adjusted by a leaf spring.
Moreover, the form which performs distance adjustment and angle adjustment separately may be sufficient. Specifically, for example, the distance is adjusted with a coil spring, and the angle is adjusted with a torsion spring or a hinge.

[Sunlight reflection mirror]
A sunlight reflecting mirror to be cleaned is configured to include at least a reflective layer on a mirror substrate. A hydrophilic layer can also be formed on the surface of the sunlight reflecting mirror in order to increase the cleaning power of the cleaning liquid. On the other hand, a water-repellent layer can be formed in order to suppress the adhesion of dirt.

The sunlight reflecting mirror cleaned with the brush of the present invention may be either a glass mirror type or a film mirror type. Above all, the film mirror type is flexible and easily deformed, so the stress from the brush in contact with the mirror surface is dispersed and not easily damaged, and the brush is evenly contacted with the mirror surface for uniform cleaning. This is preferable because the cleaning power of the brush is improved.
In addition, in the case of the film mirror type, it is possible to reduce the weight of the solar reflective mirror and to continuously form a functional layer including a reflective layer by transporting the film, resulting in high productivity, performance stability and cost reduction. Can be expected. In addition, energy savings can be expected because mirror substrates can be produced at low temperatures. Since it can be treated at low temperature during disposal and may be recyclable, energy consumption can be reduced throughout the life cycle, and is expected as a next-generation solar reflective mirror.

FIG. 19 is a cross-sectional view showing a schematic configuration of a sunlight reflecting mirror 30 which is an example of a film mirror type.
As shown in FIG. 19, the sunlight reflecting mirror 30 includes an anchor layer 32, a reflecting layer 33, a corrosion preventing layer 34, an adhesive layer 35, an ultraviolet absorbing layer 36, a hard coat layer 37, and a hydrophilic layer 38 on a resin film 31. It has. When the sunlight reflecting mirror 30 is used, the sunlight reflecting mirror 30 is arranged so that sunlight A enters from the hydrophilic layer 38 side.

(Resin film)
As the resin film 31, a conventionally known resin film can be used as long as the sunlight reflecting mirror 30 can be formed into a film shape.
The thickness of the resin film 31 can be set according to the type of resin, and is generally preferably in the range of 10 to 400 μm, more preferably in the range of 20 to 300 μm.

(Anchor layer)
The anchor layer 32 is provided between the resin film 31 and the reflective layer 33 in order to improve the adhesiveness between the resin film 31 and the reflective layer 33. The anchor layer 32 can improve heat resistance and prevent the resin film 31 from being deteriorated due to heat generated when the reflective layer 33 is formed. Moreover, the surface of the resin film 31 can be smoothed, and it is also possible to prevent the reflectance of the reflective layer 33 from decreasing.

The anchor layer 32 can be formed by applying the resin layer 31 on the resin film 31 by a gravure coating method, a reverse coating method, or the like using, for example, a polyester resin, an acrylic resin, a melamine resin, or the like.
The thickness of the anchor layer 32 is preferably in the range of 0.01 to 3.00 μm, and preferably in the range of 0.1 to 1.0 μm, from the viewpoint of improving adhesion, smoothness, and reflectance. Is more preferable.

(Reflective layer)
The reflection layer 33 is provided to reflect sunlight incident on the sunlight reflecting mirror 30.
The reflectance of the reflective layer 33 is preferably 80% or more and more preferably 90% or more from the viewpoint of efficiently collecting sunlight. The reflectance of the reflective layer 33 refers to regular reflectance.

As a material of the reflective layer 33, metals such as aluminum, silver, chromium, nickel, titanium, and magnesium can be used. Among these, from the viewpoint of obtaining high reflectance and corrosion resistance, aluminum or silver is preferable, and silver is more preferable.
The reflective layer 33 can be formed by a wet method or a dry method using the above materials. The wet method is a general term for a plating method, which is a method of forming a metal film by depositing a metal from a solution, and a method of forming silver plating using a silver mirror reaction is one of them. The dry method is a general term for vacuum film forming methods, and examples thereof include resistance heating type, ion beam assist type vacuum deposition methods, ion plating methods, sputtering methods, and the like.

(Corrosion prevention layer)
The corrosion prevention layer 34 contains a corrosion inhibitor to prevent the reflection layer 33 from being corroded.
When silver is used for the reflective layer 33, the corrosion inhibitor is a compound having amines and derivatives thereof, pyrrole ring, triazole ring, pyrazole ring, thiazole ring, indazole ring, etc., copper chelate compound, thiourea, etc. It is preferable that it is a compound which has the adsorptivity with respect to silver.

(Adhesive layer)
The adhesive layer 35 is provided between the corrosion prevention layer 34 and the ultraviolet absorbing layer 36 in order to improve the adhesion between them.
The adhesive layer 35 can be formed in the same manner as the anchor layer 32.

(UV absorbing layer)
The ultraviolet absorption layer 36 is provided in order to prevent deterioration of each layer due to the ultraviolet rays of the incident sunlight A.
The ultraviolet absorbing layer 36 is preferably an acrylic resin layer having an ultraviolet absorbing group or containing an ultraviolet absorber from the viewpoint of increasing the flexibility and weather resistance of the sunlight reflecting mirror 30 and reducing the weight. Examples of the ultraviolet absorber include inorganic compounds such as titanium oxide, zinc oxide, cerium oxide, and iron oxide in addition to organic compounds such as benzophenone, benzotriazole, phenyl salicylate, triazine, and benzoate.

(Hard coat layer)
The hard coat layer 37 is provided to prevent damage to each layer.
The hard coat layer 37 can be formed by applying an acrylic resin, a urethane resin, a melamine resin, an epoxy resin, an organic silicate compound, a silicone resin, or the like.

The hard coat layer 37 can contain additives such as a surfactant, a leveling agent, and an antistatic agent.
The surfactant is effective for smoothing the surface of the hard coat layer 37. Specific examples of the surfactant that can be used include the same examples as the surfactant that can be contained in the above-described water or a cleaning liquid containing water as a main component.
Leveling agents are effective in reducing small irregularities on the surface. As the leveling agent, for example, a dimethylpolysiloxane-polyoxyalkylene copolymer (for example, SH190 manufactured by Toray Dow Corning Co., Ltd.) is suitable as the silicone leveling agent.
The antistatic agent is effective in improving the cleaning power of the mirror surface by the cleaning liquid when the cleaning liquid is used. When the hard coat layer 37 has conductivity due to the antistatic agent, the electric resistance value on the surface of the film mirror unit can be reduced. By forming an antistatic layer as a layer adjacent to the hard coat layer 37 or through an extremely thin layer between the hard coat layer 37, the electrical resistance value of the mirror surface of the solar reflective mirror 30 is reduced, It is possible to improve the cleaning power by the cleaning liquid.

(Hydrophilic layer)
The hydrophilic layer 38 can be provided on the outermost surface from the viewpoint of increasing the cleaning power by the cleaning liquid. The hydrophilic layer 38 may be provided on the hard coat layer 37 as shown in FIG. 19 or may be provided in place of the hard coat layer 37.
The hydrophilicity exhibited by the hydrophilic layer 38 is preferably 30 ° or less, more preferably 20 ° or less, from the viewpoint of obtaining a high detergency with the cleaning liquid, with respect to the surface of the hydrophilic layer 38 with water. More preferred.
The contact angle with water (°) was 30 seconds after 3 μL of water was dropped on the hydrophilic layer 38 in an environment of a temperature of 23 ° C. and a relative humidity of 55% RH in accordance with JIS-R3257. It can be measured using a total of DM-300 (manufactured by Kyowa Interface Chemical Co., Ltd.). It shows that hydrophilic property is so high that the measured contact angle is small.

The hydrophilic layer 38 can contain a hydrophilizing agent in order to make the contact angle with water on the surface 30 ° or less.
Examples of the hydrophilizing agent that can be used include compounds containing metal elements, such as metal oxides, metal nitrides, metal carbides containing metal elements such as Si, Ti, Al, Sn, Fe, Zn, Sb, and Zn. Is mentioned.

In order to further increase the hydrophilicity, the hydrophilic layer 38 can also contain metal particles such as silica particles, alumina particles, titania particles, zirconia particles, in addition to the compound containing the metal element. By using metal particles, the surface roughness is increased, the hydrophilicity is improved, and the hydrophilic layer 38 having a contact angle of 30 ° or less can be formed. Further, if the surface roughness is large, it becomes difficult for dirt to adhere to the surface of the hydrophilic layer 38, and the cleaning liquid enters between the hydrophilic layer 38 and the dirt, so that the dirt is easily removed.
Further, the hydrophilic layer 38 may contain a silicate compound, polysilazane having a Si—N bond as a basic skeleton, or the like. Examples of the silicate compound that can be used in combination include tetrahydroxysilane, tetramethoxysilane, tetraethoxysilane, and tetraethoxyoxysilane.

The hydrophilic layer 38 can also be a layer containing a photocatalyst that is rendered hydrophilic by sunlight as a hydrophilizing agent. A photocatalyst is a substance that, when irradiated with light having energy larger than the band gap between the conduction band and the valence band, the electrons in the valence band are excited to generate conduction electrons and holes.
By containing the photocatalyst, it is possible to obtain a decomposition action of dirt adhered to the mirror surface of the sunlight reflecting mirror 30, and it is possible to obtain higher hydrophilicity.

Examples of the photocatalyst that can be included in the hydrophilic layer 38 include anatase type titanium oxide (band gap; 3.2 eV), rutile type titanium oxide (band gap; 3.0 eV), and zinc oxide (band gap; 3.2 eV). , Tin oxide (band gap; 3.5 eV), tungsten oxide (band gap; 2.5 eV), potassium tantalate (band gap; 3.4 eV), strontium titanate (band gap; 3.2 eV), zirconium oxide ( Band gap; 5.0 eV), niobium oxide (band gap; 3.4 eV), and the like. Note that since the band gap of the photocatalyst has a distribution depending on the crystal structure of the photocatalyst, the degree of purification, and the like, the actually measured bad gap may have a difference of about ± 0.2 eV from the band gap described above.

The hydrophilic layer 38 can contain a small amount of a platinum group metal such as Pt, Pd, Ru, Rh, Ir, Os, etc. in order to enhance the photocatalytic activity.
In addition, the hydrophilic layer 38 can be used in combination with the photocatalyst and metal particles such as silica particles, alumina particles, titania particles, zirconia particles, silicate compound, polysilazane having a Si—N bond as a basic skeleton, and the like. it can.

The hydrophilic layer 38 containing a photocatalyst can be formed by applying a dispersion of photocatalyst particles by a conventionally known coating method.
When the heat resistance of the resin film 31 is high, the hydrophilic layer 38 containing a photocatalyst can be formed by a sol coating baking method, an organic titanate method, a vacuum film forming method, or the like.
The sol coating and baking method is a method in which anatase-type titanium oxide sol is applied by a coating method such as a gravure coating method, a reverse coating method, or a die coating method, followed by baking.
The organic titanate method is a method in which a coating solution obtained by partially or completely hydrolyzing an organic titanate is applied by a conventionally known coating method such as a gravure coating method and dried. By drying, hydrolysis of the organic titanate is completed to produce titanium hydroxide, and an amorphous titanium oxide layer is formed by dehydration condensation polymerization of titanium hydroxide. Thereafter, firing is performed at a temperature equal to or higher than the crystallization temperature of anatase, and amorphous titanium oxide is phase-transformed into anatase-type titanium oxide.
The vacuum film formation method is a method of forming an amorphous titanium oxide layer by a vacuum deposition method, a sputtering method, or the like. Thereafter, phase transition is made to anatase-type titanium oxide by firing.

The hydrophilic layer 38 may be a layer in which a surface treatment such as a plasma treatment or an etching treatment is performed on the surface of the substrate as long as the hydrophilic layer 38 exhibits hydrophilicity such that the contact angle with water is 30 ° or less.

When the lower layer of the hydrophilic layer 38 is the ultraviolet absorbing layer 36, an inorganic coat layer may be provided between the hydrophilic layer 38 and the ultraviolet absorbing layer 36. When the hydrophilic layer 38 contains a photocatalyst, the inorganic coat layer can prevent the organic compound such as an acrylic resin contained in the ultraviolet absorption layer 36 from being decomposed by the photocatalyst.
Examples of the material for the inorganic coating layer include a silicate compound such as tetraethoxysilane and a layer containing an alcohol such as methanol. Further, the inorganic coat layer can contain a constituent component of the hydrophilic layer 38 or a constituent component of the ultraviolet absorbing layer in order to improve the adhesiveness between the hydrophilic layer 38 and the ultraviolet absorbing layer 36. The inorganic coat layer may be a single layer or a plurality of layers.

The thickness of the hydrophilic layer 38 is a suitable layer thickness depending on the refractive index of the hydrophilic layer 38, the contained components, the wavelength range of the light used for power generation among the sunlight incident on the sunlight reflecting mirror 30, and the like. Should be selected. Since use of a wavelength range as wide as possible leads to an improvement in power generation efficiency, it is preferable that the thickness is thin in consideration of light absorption by the hydrophilic layer 38. Since it is the extreme surface layer that expresses hydrophilicity, if it has a thickness of about several nanometers, hydrophilicity necessary for forming a liquid film can be expressed.
In the case of forming the hydrophilic layer 38 using photocatalyst particles, a layer thickness of at least about ½ of the particle diameter of the photocatalyst particles is necessary from the viewpoint of retention of the photocatalyst particles and prevention of falling off. If the thickness is 10 nm, a layer thickness of 5 nm or more is necessary. When the hydrophilic layer 38 containing a photocatalyst is formed by vapor deposition, sputtering, or the like, a layer thickness for expressing the photocatalyst function, that is, a layer thickness that establishes a crystal structure is required, and the photocatalyst particles are contained. As in the case, a layer thickness of 5 nm or more is necessary.
From the above viewpoint, in general, the thickness of the hydrophilic layer 38 can be selected within a range of 5 to 300 nm.

The hydrophilic layer 38 can also contain additives such as a surfactant, a leveling agent, and an antistatic agent, like the hard coat layer 37.

FIG. 20 is a cross-sectional view illustrating a schematic configuration of a sunlight reflecting mirror 30B which is an example of a glass mirror.
As shown in FIG. 20, in the sunlight reflecting mirror 30 </ b> B, a glass plate is used as a glass layer 39, and a reflective layer 33 and a corrosion prevention layer 34 are formed on the glass layer 39. The reflection layer 33 and the corrosion prevention layer 34 are the same layers as the reflection layer 33 and the corrosion prevention layer 34 of the solar light reflecting mirror 30 described above. When the sunlight reflecting mirror 30B is used, the sunlight A is arranged so as to enter from the glass layer 39 side. The thickness of the glass layer 39 is not particularly limited, but can be, for example, in the range of 1 to 5 mm.

≪Sunlight reflection mirror cleaning device≫
The solar reflective mirror cleaning device is a solar reflective mirror cleaning device for cleaning the mirror surface of the solar reflective mirror with a brush, and the solar reflective mirror cleaning brush of the present invention is applied to the mirror surface of the solar reflective mirror. Drive means for rotating in contact is provided.

FIG. 21 shows a solar reflective mirror cleaning apparatus 100 for cleaning the mirror surface of the solar reflective mirror 30 used in the solar thermal power generation apparatus as one embodiment.
The solar thermal power generation apparatus condenses sunlight on a heat collecting tube 80 by a plurality of sunlight reflecting mirrors 30 arranged in a curved surface, heats the heat medium transferred by the heat collecting tube 80, and electrically converts the heat energy of the heat medium. It is a power generation device that converts energy.
In the solar thermal power generation apparatus, the plurality of sunlight reflecting mirrors 30 are fixed to a support body such as a curved metal plate, and are supported by the support member 51 so as to form one large mirror surface. A heat collecting tube 80 is disposed at a position where sunlight is collected by the plurality of sunlight reflecting mirrors 30. A mirror angle adjusting unit 53 that rotationally drives the support member 51 is provided so that the plurality of sunlight reflecting mirrors 30 can be rotated according to the incident angle of sunlight.

As shown in FIG. 21, a solar reflective mirror cleaning device 100 (hereinafter also simply referred to as “cleaning device 100”) includes eight solar reflective mirror cleaning brushes 10 (hereinafter also simply referred to as “brushes 10”). .) In addition, the cleaning apparatus 100 includes a robot arm 103 that brings each brush 10 into contact with the mirror surface of the sunlight reflecting mirror 30 and a rotation drive unit 101 that drives each brush 10 to rotate.
The robot arm 103 is capable of turning and bending, and the solar reflective mirror cleaning brush 10 is attached on the arm substrate 1015 at the tip.
In addition, when a brush has a distance adjustment mechanism or an angle adjustment mechanism in the surface on the opposite side to the brush bristles 2 in the brush board | substrate 1, the rotating shaft direction of the brush board | substrate 1 is via the said distance adjustment mechanism or an angle adjustment mechanism. The brush substrate 1 is attached to a shaft (not shown) of the rotation drive unit 101 so as to be freely reciprocated.

Further, as shown in FIG. 21, the solar reflective mirror cleaning device 100 preferably includes a cleaning liquid tank 1021, a supply pipe 1022, an injection nozzle 1023, and the like as cleaning liquid supply means. The supply pipe 1022 is piped on the arm substrate 1015 and in the robot arm 103 so as to connect the spray nozzle 1023 and the tank 1021. The cleaning apparatus 100 supplies the cleaning liquid by sending the cleaning liquid from the tank 1021 to the spray nozzle 1023 via the supply pipe 1022 and spraying it onto the mirror surface by the spray nozzle 1023.

The cleaning device 100 arranges eight brushes 10 in a row in the vertical direction of the sunlight reflecting mirror 30 and performs vertical cleaning at once. However, the number of the brushes 10 is reduced, and each brush 10 is mirrored by the robot arm 103. You may make it wash | clean by moving the position which contact | abuts to a vertical direction.
Further, the cleaning apparatus 100 includes a vehicle 104 that travels as shown in FIG. 21 as a moving unit that moves the position where each brush 10 abuts against the mirror surface in the lateral direction of the sunlight reflecting mirror 30, and includes a sunlight reflecting mirror. The sunlight reflecting mirror 30 can be continuously washed while moving the position where the brush 10 abuts in the horizontal direction 30.

(Cleaning solution)
As the cleaning liquid, water can be used, and an additive may be contained as long as water is a main component. “Water as a main component” means that the content of water in the liquid component excluding the solid component is in the range of 30 to 100% by mass.
A water component that contaminates the mirror surface of the sunlight reflecting mirror 30 and has little adverse effect of reducing the reflectance or power generation efficiency is suitable as a cleaning liquid for the sunlight reflecting mirror.
In particular, in a solar thermal power generation apparatus that generates power by secondary heating of water using a heat medium heated by sunlight to generate steam to rotate a turbine, steam generated during power generation can also be used as a cleaning liquid. Since solar thermal power generation devices are often installed in areas with little water, such as desert areas, precious resources can be reused and cleaning costs can be reduced.

Additives that can be used in the cleaning liquid include organic solvents, surfactants, salts, acids / bases, resins, fibers, particulate matter, etc., from the viewpoint of enhancing the cleaning power of the cleaning liquid and facilitating the removal of dirt. It is done. The additive is preferably highly compatible with water.

Examples of the organic solvent include alcohols such as methanol, ethanol, propanol, butanol, isopropyl alcohol, ethylene glycol, and propylene glycol, and hydrocarbons such as acetone and methylene chloride.
Examples of the surfactant include anionic, cationic, amphoteric, and nonionic, specifically, anionic surfactants such as polyoxyethylene alkyl ether acetate, dodecylbenzene sulfonate, and laurate, Nonionic surfactants such as polyoxyethylene alkyl ethers are listed.
Examples of the salts include sodium chloride and sodium hydrogen carbonate, and examples of the acids include acetic acid and phthalic acid.
With these additives, it is possible to easily remove the dirt with the cleaning liquid and to improve the cleaning power at the time of cleaning.

≪How to clean the sunlight reflecting mirror≫
The method for cleaning a solar reflective mirror of the present invention is a method of cleaning the mirror surface of the solar reflective mirror with a brush, and the brush for cleaning the solar reflective mirror of the present invention is brought into contact with the mirror surface of the solar reflective mirror. The mirror surface is cleaned by adjusting the distance and angle between the plurality of brush bristles and the sunlight reflecting mirror while rotating them.
Hereinafter, as a preferred embodiment of the solar reflective mirror cleaning method of the present invention, an example in which the mirror surface of the solar reflective mirror 30 is cleaned by the solar reflective mirror cleaning apparatus 100 will be described.

First, the solar reflective mirror cleaning apparatus 100 presses the solar reflective mirror cleaning brush 10 against the mirror surface of the solar reflective mirror 30 with the robot arm 103 to bring it into contact therewith. The pressure on the mirror surface of the brush 10 is preferably in the range of 200 to 3500 Pa from the viewpoint of smoothing the rotation of the brush 10 to increase the cleaning power and preventing damage to the mirror surface. The robot arm 103 may detect the pressure on the mirror surface, and automatically control the pressure for pressing the brush 10 against the mirror surface so that the detected pressure is within the above range.

In the solar reflective mirror cleaning method according to the present invention, as described above, while rotating in contact with the mirror surface of the solar reflective mirror of the present invention, the plurality of brush hairs and the solar reflective mirror are further rotated. Adjust the distance and angle.

The method for adjusting the distance and the angle is not particularly limited. However, in the method for cleaning the solar reflective mirror according to the present invention, when the bristles contact the mirror surface, the distance adjusting mechanism and the angle adjusting mechanism according to the present invention. The aspect which adjusts the distance and angle of a mirror surface and brush hair by energizing brush hair according to reaction force from a mirror surface which 41 receives via brush hair is preferable.

As shown in FIG. 21, when a plurality of sunlight reflecting mirrors 30 are used and the mirror surface to be cleaned has a large area, the position of the brush 10 that contacts the mirror surface is moved by the robot arm 103 or the vehicle 104. Clean the mirror surface thoroughly.

≪Cleaning system for sunlight reflecting mirror≫
The solar reflective mirror cleaning system of the present invention comprises a solar reflective mirror cleaning brush of the present invention and means for rotating the solar reflective mirror cleaning brush in contact with the mirror surface of the solar reflective mirror. And having.
Specifically, it is a cleaning system for cleaning the solar reflective mirror by the solar reflective mirror cleaning device 100. In the cleaning apparatus 100, the driving unit corresponds to a unit that rotates the solar reflective mirror cleaning brush in contact with the mirror surface of the solar reflective mirror.

Note that embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

For example, in the above description, an example has been described in which the planting holes are formed in the attachment device 4 and the plurality of brush hairs 2 are implanted in the attachment device 4 to fix the plurality of brush hairs 2. Without being limited thereto, the plurality of bristles 2 may be fixed by holding the plurality of bristles 21 formed from the plurality of bristles 2 by the attachment device 4.

Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto. In addition, although the display of "part" or "%" is used in an Example, unless otherwise indicated, it represents "mass part" or "mass%".

[Sunlight reflecting mirror cleaning brush [0]]
The brush substrate does not have a distance adjustment mechanism and an angle adjustment mechanism, and the arrangement pattern of the distance adjustment mechanism and the angle adjustment mechanism (hereinafter also simply referred to as “arrangement pattern”) is 0, and the solar reflective mirror cleaning brush (hereinafter, (Simply referred to as “brush”.) [0] was manufactured.
The brush [0] of the arrangement pattern 0 is a general brush that does not have the distance adjustment mechanism and the angle adjustment mechanism shown in FIG.
The brush substrate used was a circular brush substrate having a diameter of 600 mm.
Further, in the brush [0], a plurality of brush hairs were formed into a hair bundle having an average length of 80 mm and provided on the entire surface of the brush substrate via the attachment device 4. Further, as the bristles, polypropylene (PP) fiber bristles having an average monofilament diameter of 1 mm were used. When the official moisture content of the brush hair used for the brush [0] was measured according to JIS L0105, it showed a hydrophobicity of less than 1%.

The average diameter of the brush hair monofilament was observed with a digital microscope VH-5500 (manufactured by KEYENCE), and the diameter of the brush hair monofilament was measured. Specifically, the average value of the fiber diameter distribution obtained by randomly selecting the measurement locations, measuring at N = 500, and statistically processing was used as the average diameter of the monofilaments of the brush hair.

[Sunlight reflecting mirror cleaning brush [1]-[3]]
In the production of the solar reflective mirror cleaning brush [0], the sun is made in the same manner as the brush [0] except that the arrangement patterns of the distance adjustment mechanism and the angle adjustment mechanism are arranged in the arrangement patterns [1] to [3]. Light reflecting mirror cleaning brushes [1] to [3] were produced.
The arrangement pattern [1] is the arrangement pattern shown in FIG. 4, the arrangement pattern [2] is the arrangement pattern shown in FIG. 5, and the arrangement pattern [3] is the arrangement pattern shown in FIG.

[Brush for cleaning sunlight reflecting mirror [4]]
In manufacturing the solar reflective mirror cleaning brush [0], as shown in FIG. 1, the brush bristles are partially provided instead of the entire surface of the brush substrate via the attachment device 4, and the distance adjustment mechanism and the angle adjustment mechanism The arrangement pattern was changed to arrangement pattern [4]. The arrangement pattern [4] is the arrangement pattern shown in FIG.
Further, nylon 66 was used as the brush hair, and the average diameter of the monofilament was 0.1 mm.
Otherwise, the solar reflective mirror cleaning brush [4] was manufactured in the same manner as the solar reflective mirror cleaning brush [0].
In addition, about the bristle used with brush [4], when the official moisture content was measured based on JISL0105, 1% or more of hydrophilic property was shown.

[Sunlight reflecting mirror cleaning brush [5]-[15]]
In the manufacture of the solar reflective mirror cleaning brush [4], the sun and solar brushes are operated in the same manner as the brush [4] except that the arrangement pattern of the distance adjustment mechanism and the angle adjustment mechanism is changed to the arrangement patterns [5] to [15]. Light reflecting mirror cleaning brushes [5] to [15] were produced.
The arrangement patterns [5] to [15] are the arrangement patterns shown in FIGS.

[Film mirror type solar reflective mirror]
An anchor layer having a thickness of 0.1 μm was formed on one side of a 100 μm-thick polyethylene terephthalate film (hereinafter referred to as PET film) obtained by biaxial stretching. The anchor layer is made of polyester resin Esper 9940A (Hitachi Chemical Co., Ltd.), melamine resin, isocyanate cross-linking agent tolylene diisocyanate and hexamethylene diisocyanate (Mitsui Chemical Fine Co., Ltd.) 20: 1: 1, respectively. A resin mixed at a mass ratio of 2 was applied by gravure coating.
Next, a reflective layer having a thickness of 80 nm was formed by vacuum evaporation using silver.

On the formed reflective layer, a corrosion prevention layer coating solution was applied by a gravure coating method to form a corrosion prevention layer having a thickness of 0.1 μm. The coating solution is 10% by weight of Tinuvin 234 (made by BASF Japan) based on the resin solid content in a resin in which Esper 9940A and tolylene diisocyanate are mixed at a resin solid content ratio (mass ratio) of 10: 2, respectively. It was prepared by adding as a corrosion inhibitor.

Next, on the corrosion prevention layer, vinylol 92T (acrylic resin adhesive, manufactured by Showa Denko) was applied to a thickness of 0.1 μm to form an anchor layer. An acrylic resin film formed by a solution casting method was laminated on the anchor layer to form an ultraviolet absorbing layer. The arithmetic average roughness Ra of the surface of the ultraviolet absorbing layer was 0.1 μm, and the layer thickness was 50 μm.

Next, a silicone hard coat Perma-New 6000 (California Hardcoating Company) was applied onto the UV absorbing layer with a wire bar to form a hard coat layer having a thickness of 3 μm. A light reflecting mirror was manufactured.

[Glass mirror type sunlight reflecting mirror]
On the glass plate with a thickness of 4 mm, in the same manner as the film mirror type, a reflective layer with a thickness of 80 nm is formed by vacuum deposition using silver, and further a corrosion prevention layer with a thickness of 0.1 μm is formed. A glass mirror type solar reflective mirror was manufactured.

≪Evaluation≫
Using the solar reflective mirror cleaning brushes [0] to [15] as described below, the solar reflective mirror was cleaned, and each brush was evaluated.
The results are as shown in Table 1.

[About glass mirror type]
<Washing method>
A plurality of film mirror type solar reflective mirrors are arranged as shown in FIG. 21, and eight solar reflective mirror cleaning brushes 10 are mounted on the solar reflective mirror cleaning apparatus 100 shown in FIG. The mirror surface of the sunlight reflecting mirror was washed. The cleaning was performed once immediately before installing the sunlight reflecting mirror outdoors and once three months after installation.
At the time of cleaning, the position where each brush 10 abuts on the mirror surface was moved in the lateral direction of the sunlight reflecting mirror at a speed of 1.0 km / h, and each brush 10 was rotated at a rotational speed of 95 rpm. In parallel with the rotation of each brush 10, water was sprayed as a cleaning liquid.
In this way, a glass mirror type sunlight reflecting mirror was washed.

(Detergency)
After cleaning the solar reflective mirror to be cleaned immediately before being placed outdoors by the above-described cleaning method, the reflectance Ta (%) of the solar reflective mirror was measured. Next, the solar reflective mirror was installed outdoors, and after three months, the solar reflective mirror was washed again by the above-described cleaning method, and then the reflectance Tb (%) of the solar reflective mirror was measured. The reflectances Ta and Tb are adjusted so that the incident angle of incident light is 20 ° with respect to the normal line of the reflecting surface, and the regular reflectance (%) at the reflection angle of 20 ° is set to a gloss meter GM-268 (Konica Minolta). ). From the measured reflectivity Ta and Tb, the recovery rate of the reflectivity of the solar reflective mirror was obtained by the following formula, and evaluated as the cleaning power of the solar reflective mirror cleaning brushes [0] to [15].
Reflectivity recovery rate (%) = Tb (%) / Ta (%) × 100
When the recovery rate of the reflectance is 90% or more, a reflectance that can be used as a sunlight reflecting mirror can be obtained.

The evaluation criteria for the cleaning power are as follows.
◎… 95% or more ○… 90% or more and less than 95% △… less than 90%

(Uniformity)
In the sunlight reflecting mirror, the Tb was measured at 8 vertical points × 10 horizontal points (a total of 80 points), and the uniformity was evaluated using the worst reflectance among the 80 points as an evaluation target.

The evaluation criteria for uniformity are as follows.
◎… 90% or more ○… 85% or more and less than 90% ×… less than 85%

[About film mirror type]
<Washing method>
Cleaning was performed in the same manner as the glass mirror type cleaning, except that a film mirror type was used as the sunlight reflecting mirror.

(Evaluation with scratches)
The washed sunlight reflecting mirror is washed 20 times using a brush, the area of the generated scratch is observed, and the ratio of the area and the area of the entire sunlight reflecting mirror is calculated, thereby being damaged. Evaluated.

The evaluation criteria with scratches are as follows. The results are shown in Tables 1 and 2.
○ ... 0%
Δ: Greater than 0%, 10% or less ×: Greater than 10%, 50% or less XX: Greater than 50%, 100% or less

As described above, the present invention is suitable for providing a solar reflective mirror cleaning brush that can be uniformly cleaned with high cleaning power without damaging the solar reflective mirror.

DESCRIPTION OF SYMBOLS 10 Sunlight reflecting mirror cleaning brush, brush 1 Brush substrate 13 Planting hole 2 Brush hair 21 Hair bundle 22 Stopper 4 Mounting tool 41 Distance adjusting mechanism and / or angle adjusting mechanism 100 Cleaning device and cleaning device for solar reflecting mirror 101 Rotation drive unit 103 Robot arm

Claims

A brush for cleaning a sunlight reflecting mirror that cleans the mirror surface by rotating in contact with the mirror surface of the sunlight reflecting mirror,
A rotatable brush substrate;
A plurality of brush bristles provided on the brush substrate and rotating with the rotation of the brush substrate; and
A brush for cleaning a sunlight reflecting mirror, comprising a distance adjusting mechanism and an angle adjusting mechanism for adjusting a distance and an angle between the mirror surface and the brush bristles.
The solar reflective mirror cleaning brush according to claim 1, wherein the distance adjusting mechanism or the angle adjusting mechanism is an urging mechanism.
3. The solar reflective mirror cleaning brush according to claim 2, wherein the biasing mechanism is at least one selected from a spring, rubber, a balloon, and a damper.
The said distance adjustment mechanism or the said angle adjustment mechanism exists between the said brush board | substrate and the said brush bristles, The solar reflective mirror washing | cleaning as described in any one of Claim 1 to 3 characterized by the above-mentioned. brush.
The distance adjusting mechanism or the angle adjusting mechanism is provided on a surface of the brush substrate opposite to the brush bristles, according to any one of claims 1 to 4. Brush for cleaning sunlight reflecting mirrors.
The solar reflective mirror cleaning brush according to any one of claims 1 to 5, wherein an average diameter of the plurality of brush hairs is in a range of 1 µm to 1 mm.
The solar reflective mirror cleaning brush according to any one of claims 1 to 6, wherein the plurality of brush hairs are made of hydrophilic fiber hairs.
The solar reflective mirror cleaning brush according to any one of claims 1 to 7,
And a means for rotating the solar reflective mirror cleaning brush in contact with the mirror surface of the solar reflective mirror.
The solar reflective mirror cleaning system according to claim 8, wherein the solar reflective mirror is a film mirror type.
A method for cleaning a solar reflective mirror, wherein the mirror surface of the solar reflective mirror is cleaned with a brush,
The plurality of brush hairs and sunlight reflection while rotating the solar reflective mirror cleaning brush according to any one of claims 1 to 7 in contact with a mirror surface of the solar reflective mirror. A method for cleaning a solar reflective mirror, wherein the mirror surface is cleaned by adjusting a distance and an angle with the mirror.
The method for cleaning a solar reflective mirror according to claim 10, wherein the solar reflective mirror is a film mirror type.
A solar reflective mirror cleaning apparatus comprising the solar reflective mirror cleaning brush according to any one of claims 1 to 7.
The solar reflective mirror cleaning device according to claim 12, wherein the solar reflective mirror is a film mirror type.