JP2001064930A - Reflecting-panel washing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing device, for which large-scale traffic regulation is made unnecessary and which has excellent washing efficiency and the small discharge of drainage, when a reflecting panel in the tunnel of an expressway or the like is washed. SOLUTION: A slender vessel-shaped hood 10 in which a brush 9 is implanted at a peripheral end is pushed against a reflecting panel 3 on a tunnel interior wall 2 or the like. Nozzles 7 are arrayed in the vertical direction on a manifold 6 in the hood 10, and a high-speed water jet blown out from the nozzles 7 after the inside of the hood 10 is filled with water from the nozzles 7 collides with the reflecting panel 3 as a strong cavitation-jet 8. Accordingly, the dirt (extraneous matter such as soot, tar or the like) of the reflecting panel 3 is washed. Sewage after washing is drained 12 under a vacuum, and sludge is coagulated and removed and reutilized. Sewage leaking from the brush 9 is recovered from a drain pipe 19 and reutilized similarly. When the washing device is manufactured in a car loading type, it works extremely efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cleaning a reflective panel, and more particularly, to a technique for cleaning an illuminated reflective panel installed in an automobile tunnel or the like.
The present invention relates to a cleaning apparatus suitable for decomposing harmful substances in cleaning wastewater and further enhancing a cleaning effect.

[0002]

2. Description of the Related Art Tunnels such as highways have a total length of 50.
In a long tunnel exceeding 0 m, a reflection panel is attached to a side wall of the tunnel in order to effectively use the illumination in the tunnel.

[0003] In this type of reflective panel, the reflective surface is generally white. However, fine particles such as soot contained in smoke discharged from an engine, various dusts and oil droplets brought in by a vehicle,
Alternatively, scattering mud particles adhere, become dirty and dark gray, and reduce the illuminance in the tunnel. Therefore, regular cleaning is performed.

[0004] One of the general cleaning methods is as follows.
There is a method in which a flush operator blows high-pressure water onto a reflective panel with a hose, and another method is a so-called dry method in which the operator wipes off dirt on the reflective panel by using a mop or the like.

[0005]

However, these conventional cleaning methods have the following problems. The former method uses a large amount of water, because a flush operator operates a hose to spray a water jet on a dirty reflective panel and use a large amount of water.
There is a problem that a large amount of contaminated washing wastewater is generated. Further, the latter method in which the worker wipes off the dirt on the reflection panel by using a mop or the like requires a low work efficiency of the worker and a heavy burden on the worker.

[0006] Each of the methods has a problem in that the working efficiency is not high, so that the work period of the cleaning operation is prolonged, and further, there is a problem that the burden on the operator is large. As a result, the conventional cleaning method has low cleaning efficiency, requires a long-term process, has an excessive human burden, and is expensive.

[0007] An object of the present invention is to clean a reflective panel installed in a tunnel such as a highway or the like without the need for extensive traffic control, and with high cleaning efficiency and low drainage. It is to provide a device.

[0008]

In order to solve the above-mentioned problems, according to the present invention, nozzles for jetting a water jet are arranged in a vertical direction, that is, a vertical direction, facing a reflection surface of a reflection panel. Is attached to the manifold to which high-pressure washing water is supplied. The nozzle is covered with a hood, and the outer edge of the hood is brushed.

The water jetted as a water jet is temporarily stored inside the hood. Therefore, the water jet is blown into the washing water inside the hood, and severe cavitation occurs. In the present invention, by the action of this cavitation,
Removes and cleans tar-like substances adhering to the reflective panel.

In this case, if the hood is reciprocated up and down with respect to the reflection panel and is moved in the horizontal direction while cleaning the height direction of the reflection surface, the reflection panel on the side wall of the road can be efficiently cleaned. When the reflection surface is relatively small, the entire surface may be covered with a hood, and only the nozzle in the hood may be moved up and down, or the nozzle may be fixed on the entire surface.

On the other hand, a suction duct is provided at a lower portion of the hood, and the washing drainage in the hood is sucked through the duct. The amount of water jet and the amount of suction of the water jet are balanced so that the inside of the hood is not hollow or overpressurized. Washing drainage leaks from the brush on the outer edge of the hood, and this is collected as drainage drainage.

A coagulant is added to the suctioned washing wastewater, and the substance recovered as a result of the washing is agglomerated in the separation tank, sludge-like and floated or settled. In this separation tank, after separating into sludge-like substance and water, the water passes through the screen part and is used again for washing. Due to such a configuration, in the present invention, less wastewater is discharged out of the system as compared with the related art.

[0013] The above set of cleaning devices is used for a vehicle running at a low speed in a tunnel (low speed means compared to a general vehicle operating in a tunnel), or a cart towed by such a vehicle. Mounted and applied to cleaning of reflective panels in tunnels.

According to the present invention, since the inside of the hood is filled with washing water, severe cavitation occurs in the water jet blown out from the nozzle. Due to the impact of cavitation, tar-like substances adhering to the reflective panel are thoroughly removed. In addition, a carcinogenic substance such as ventzpyrene derived from diesel exhaust gas contained in the washing wastewater is decomposed by the thermal decomposition or oxidation effect of the adiabatic compression process when the cavitation bubbles are crushed.

The waste water in the hood is collected by vacuum suction. Drainage leaking from the brush on the outer edge of the hood is also collected as drain. A coagulant having a concentration of about 100 ppm is added to the collected wastewater. The fine particles suspended in the wastewater aggregate and float or settle.

Agglomerates are collected as sludge, and water from which sludge has been removed is reused as washing water after removing foreign matter with a filter. As described above, in the present invention, since the washing water is reused, the washing wastewater discharged to the outside of the system is greatly reduced, and the harmful substances in the washing wastewater are also reduced.

The hood to which the nozzle is attached is attached to a vehicle or a cart and moved forward, so that only the operator operates the switch, and the burden of the washing operation is greatly reduced. Further, since the washing part by the jet is a closed space by the hood, the working environment is remarkably improved with little noise and no splash.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. (A) First, a specific configuration of the present invention will be described. FIG.
1 shows a configuration of a main part of a cleaning apparatus embodying the present invention for a reflective panel in a tunnel.

As shown in the figure, a vertically long container-shaped hood 10 is attached to a reflection panel 3 attached to an inner wall 2 of a tunnel 1.
Press. The outer edge of the hood 10 has a brush 9
Since the hood 10 is filled with water, a part of the water leaks through the brush 9.

A nozzle manifold 6 is provided in the hood 10 in the vertical direction, and the nozzles 7 are arranged in the nozzle manifold 6 in the vertical direction. The high-pressure pipe 5 for feeding the high-pressure washing water 4 branches into two at the entrance of the hood 10,
The upper and lower ends of the nozzle manifold 6 are connected.

Since the inside of the hood 10 is filled with water blown from the nozzle 7, the high-speed water jet blown from the nozzle 7 becomes a cavitation jet 8 accompanied by vigorous cavitation and collides with the reflection panel 3. I do. In the present invention, it is not necessary to make the pressure of the high-pressure washing water excessively high in order to utilize the action of such cavitation.

With the cavitation jet 8,
Soot and tar-like dirt adhering to the reflective panel 3 are washed, and the contaminated washing water used for washing is drained to a vacuum drain 12 through a water pipe 11 provided below the hood 10. Washed contaminated water that was not drained
Drain cup 13 leaking from brush 9 and provided at the bottom
To the drain drain pipe 19 as drain drain 14.
Collected through.

FIG. 2 is a cross-sectional view illustrating the structure of the nozzle 7 used to create the cavitation jet 8. The high-pressure washing water 4 is guided through a high-pressure water supply channel 41 and passes through a narrowed channel.
Squirts into the surrounding water 45 in the hood 10 to form the cavitation jet 8.

A substantially hanging bell-shaped enlarged hollow portion 43 is provided at the tip of the ejection hole 42. Around the cavitation jet 8 in the enlarged cavity 43, a circulation vortex 44 is wound around the cavitation jet 8.
Occurs. The circulation vortex 44 has a function of increasing the power of cavitation in the cavitation jet 8.

FIG. 3 is a diagram showing the appearance and operation of the cleaning member shown in FIG. The hood 10 in which water jet cleaning is performed simply cleans the entire reflecting panel 3 while traversing up and down a in addition to simply advancing in that direction along the road.

The upper and lower traverses a are performed by transmitting the driving force of the motor 16 between the belt 17 and the pulley 18. When the reflection panel is relatively small, the hood covering the entire surface may be fixed, or only a small number of nozzles may be movable up and down in the hood.

The whole apparatus is fixed to a cart provided on a moving vehicle by a support 15 and moves forward at a speed of 0.5 to 1.0 m / s. That is, the vehicle advances laterally along the road while cleaning the entire surface in the height direction of the reflection surface.

FIG. 4 is a view showing the entire system of a cleaning apparatus embodying the present invention. In the present invention, in order to reduce the washing wastewater as much as possible, solids such as fine particles in the washing wastewater are removed by the coagulation separation method, and the washing water is reused.

First, it is temporarily stored in a water supply tank 21, passed through a filter 22, and then sent to a plunger pump 23. The high-pressure cleaning water 4 pressurized to a predetermined pressure by the plunger pump 23 passes through the high-pressure pipe 5 and is guided to the nozzle 7 in the hood 10 to become a cavitation jet.

The washing drain and drain drain 14 in the hood 10
Enters the flotation tank 29 by the action of the circulation pump 26 and the drain circulation pump 25. On the way, a trace amount of coagulant is added to the waste water. The wastewater flowing into the flotation tank 29 is stirred by a stirrer 28 for promoting the mixing of the flocculant 27, and bubbles 35 are supplied from a fine bubbler 31 for promoting flotation.

The coagulated solids overflow from the upper part of the flotation tank 29 and are sent to the secondary separation tank 38 where they are separated again into sludge 37 and waste water 38. The water discharged from the lower part of the flotation tank 29 and the lower part of the secondary separation tank 38 merge, return to the water supply tank 21 as circulating water 40,
Used for cleaning.

(B) Next, the specific operation of the present invention will be described. FIG. 5 schematically illustrates the behavior of the cleaning unit, that is, the nozzle unit of the apparatus embodying the present invention.
The high-pressure washing water 4 blows out from the nozzle 7 into the water filling the hood, and becomes a cavitation jet 8 accompanied by intense cavitation.

The cavitation jet 8 collides with the reflection panel 3, and destroys the attached matter by the action of the water flow caused by the collision and the action of generating the impact pressure when the cavitation bubbles are crushed, and is washed off the reflection panel 3.

In the reflection panel 3, an impact pressure distribution 57 is generated in the radial direction of the impinging jet. In this impact pressure distribution, the magnitude of the impact pressure is not uniform, but in FIG. 5, since the rows of the nozzles 7 traverse in the vertical direction, the impact pressure applied to the reflective panel 3 is almost equal in terms of time average. Be even.

As shown in the upper part of FIG. 5, an impact pressure distribution also occurs in the axial direction of the cavitation jet 8. This impact pressure distribution has two peaks. The peak 55 near the nozzle 7 is called a first peak, and the downstream peak 56 is called a second peak.

In the present embodiment, in order to make the most of the power of cavitation in the cavitation jet 8, the nozzles are set so that the standoff distance Xs between the nozzle 7 and the reflection panel 3 corresponds to the second peak. 7
Is set. The debris 53 of the attached matter removed from the washing drainage and the reflection panel is discharged from the nozzle as vacuum drainage.

Here, a manual cleaning method will be described for reference. FIG. 8 shows a method in which a high-pressure water 50 is sprayed from a jet gun 47 attached to a hose 49 onto a dirty reflective panel 3 by an operation of a flushing operator 46. According to this method, a large amount of water is used, so that a large amount of contaminated washing wastewater is generated.

The method shown in FIG. 9 is a so-called dry method in which the worker 51 wipes off the dirt on the reflection panel 3 with a mop 52. Both of the methods shown in FIG. 8 and FIG. 9 are for manual operation, so that the operation efficiency is low, the work period of the cleaning operation is long, and the burden on the flushing operator is large.

FIG. 6 shows a comparison between the embodiment of the present invention shown in FIGS. 1 to 4 and the reference example shown in FIG. The dimension of the rinsing time t on the vertical axis was made dimensionless by dividing by the rinsing time t * in the reference example of FIG.

Therefore, in the technique of the reference example, t /
t * = 1. In contrast, in embodiments of the present invention (FIGS. 1-4), a t / t * ~ 0.19, significant reduction of the washing time was achieved. Thus, the fact that the washing time is short suggests that the washing drainage can be suppressed to a small amount.

FIG. 7 shows a comparison between the embodiment of the present invention shown in FIGS. 1 to 4 and the reference example shown in FIG. Washing drainage amount W on the vertical axis
Is dimensionless by dividing by the cleaning discharge amount W * in the reference example of FIG.

That is, in the reference technology, W / W * =
It becomes 1. On the other hand, in the embodiment of the present invention, W /
W * ~ 0.07, the amount of drainage is 1 compared to the reference example
/ 10 or less, indicating that the reduction was overwhelming.

This is the same as eliminating the need for a special drain tank and reducing the amount of water supply for the water jet.
This shows that the amount of drainage that leaks and is discharged from gutters and the like is naturally reduced, greatly contributing to reduction of cleaning costs and maintenance of the environment around the tunnel.

Next, another embodiment of the present invention will be described. In the above-described embodiment, water and fine particles in the washing wastewater are separated while adding a small amount of a flocculant and blowing air into the flotation tank. However, depending on the properties of the washing wastewater, such as the physical properties and amount of the fine particles or the properties of water, it is possible to omit the coagulant additive and the blowing of bubbles.

Similarly, depending on the properties of the washing waste water, the aggregated fine particles may settle at the bottom of the separation tank instead of floating in the separation tank. In this case, by providing a discharge line at the bottom of the separation tank and discharging the sludge-like fine particles concentrated at a high concentration together with the water, it is possible to cope with the same method as the above-described embodiment. It is possible.

As described above, the effects obtained by implementing the present invention are summarized as follows. (1) Work efficiency is remarkably improved as compared with the related art. The cleaning time is shortened and the cost is greatly reduced.

(2) In connection with the effect of the above (1), traffic regulations are eased and the distribution becomes smooth. In addition, operational safety related to vehicle operation is also ensured. (3) The amount of water used for washing, that is, the amount of wastewater is reduced. (4) Solid particles in the washing wastewater are separated, and harmful substances such as benzopyrene contained in the smoke soot are decomposed.

(5) The burden on the washing operator is reduced. (6) In connection with the above (3) and (4), since the amount of washing and discharge is small and the water is purified, the influence on the natural environment in the surrounding area of the tunnel or the living environment of local residents is reduced. .

[0049]

As described above, according to the present invention, when cleaning the reflective surface of a reflective panel installed in a tunnel such as a highway, a large traffic regulation for cleaning is not required. It is possible to perform labor-saving cleaning with high cleaning efficiency and a small amount of drainage.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a water washing unit in a reflection panel cleaning apparatus according to the present invention.

FIG. 2 is a view showing the structure and operation of a nozzle according to the present invention.

FIG. 3 is a perspective view illustrating a configuration of a drive unit of the reflection panel cleaning apparatus according to the present invention.

FIG. 4 is a system diagram showing the entire configuration of the reflection panel cleaning apparatus according to the present invention.

FIG. 5 is a view for explaining the operation of the water washing section in the present invention.

FIG. 6 is a diagram showing a specific cleaning time as an effect of the present invention.

FIG. 7 is a diagram showing a specific cleaning drainage amount as an effect of the present invention.

FIG. 8 is a diagram showing a reference example in comparison with the present invention.

FIG. 9 is a diagram showing another reference example in comparison with the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel 2 Tunnel inner wall 3 Reflection panel 4 High pressure washing water 5 High pressure pipe 6 Nozzle manifold 7 Nozzle 8 Cavitation jet 9 Brush 10 Hood 11 Drain pipe 12 Vacuum drain 13 Drain cup 14 Drain drain 15 Support 16 Motor 17 Belt 18 Pulley 19 Drain Drainage pipe 27 Flocculant 29 Flotation tank 31 Fine bubbler 41 High-pressure water supply channel 42 Spouting hole 43 Enlarged cavity 44 Circulation vortex 45 Ambient water 54 Ambient water 55 First peak 56 Second peak 57 Impact pressure distribution

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Yatabe 2-4-1 Hamamatsucho, Minato-ku, Tokyo Babcock Hitachi, Ltd. F-term (reference) 3B201 AA02 AA36 AB51 BB22 BB33 BB46 BB55 BB62 BB87 BB75 BB87 BB90 CD22 CD35 4F033 AA04 BA04 DA01 EA06 LA11 NA01

Claims (13)

[Claims] 1. An apparatus for cleaning a reflection panel installed on a side wall of a road for reflecting illumination light, comprising: a hood disposed opposite to the reflection panel; A reflective panel cleaning apparatus, comprising: a plurality of nozzles for injecting high-pressure water onto the reflective panel. 2. The reflection panel cleaning apparatus according to claim 1, further comprising a sealing member for sealing a gap between an outer edge of the hood and the reflection panel. 3. The reflection panel cleaning apparatus according to claim 2, wherein the sealing member is a brush having a cotton-like body implanted at a high density. 4. The nozzle according to claim 1, wherein the nozzles are arranged vertically in a manifold in the hood.
Or the reflective panel cleaning device according to item 3. 5. The stand-off distance between the nozzle outlet end and the reflection panel is equal to 70 mm of the ejection hole diameter of the nozzle.
The reflection panel cleaning apparatus according to any one of claims 1 to 4, wherein the reflection panel cleaning apparatus has a magnification not less than twice and less than 160 times. 6. The reflection panel cleaning apparatus according to claim 1, wherein the nozzle has an enlarged cavity extending from a tip of the ejection hole. 7. The reflection panel cleaning apparatus according to claim 1, further comprising a cleaning water recovery unit that suctions and recovers the cleaning water in the hood. 8. The reflection panel cleaning apparatus according to claim 7, further comprising a separation unit for separating a contaminant from the cleaning water. 9. The reflection panel cleaning apparatus according to claim 8, further comprising a supply unit that supplies at least one of a bubble and a coagulant to the separation unit. 10. The reflection panel cleaning apparatus according to claim 8, further comprising separated water re-supplying means for re-supplying water from which contaminants have been separated by the separating means to the nozzle. 11. The reflection panel cleaning apparatus according to claim 1, further comprising nozzle driving means for reciprocating the nozzle vertically with respect to the reflection panel. 12. A hood driving means for reciprocating the hood up and down with respect to the reflection panel, and a moving means for moving along the road while reciprocating the hood up and down. 12. The apparatus for cleaning a reflective panel according to claim 1. 13. A vehicle-mounted reflection panel cleaning apparatus, wherein the reflection panel cleaning apparatus according to any one of claims 1 to 12 is mounted on a vehicle or a truck pulled by the vehicle.