JP2008149984A - Vehicle body washing method, spray nozzle used for it and vehicle body washing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body washing method capable of not only avoiding bad influence of peeling of a coated film but also efficiently washing a vehicle body with a minimum facility. <P>SOLUTION: When a washing liquid (29) is sprayed to wash dirt on a vehicle body surface 2W, a gas is naturally sucked into a spray nozzle 21 by a flow speed of the washing liquid (29), collision is performed in the spray nozzle 21 to produce the foamed washing liquid 29, and the foamed washing liquid 29 is jetted to the vehicle body surface 2W. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle body cleaning method, an injection nozzle used therefor, and a vehicle body cleaning device, and more particularly to a vehicle body cleaning method for injecting a cleaning liquid mixed with fine bubbles to clean dirt on the vehicle body, an injection nozzle used therefor, and a vehicle body cleaning device.

  In recent years, in order to avoid the adverse effects of peeling of the coating film of the vehicle body that is the object to be cleaned, instead of the high-pressure jet cleaning method, a vehicle body cleaning method that sprays a cleaning liquid mixed with fine bubbles to clean the vehicle body, for example, As disclosed in Patent Document 1 and Patent Document 2, it has already been proposed.

  The vehicle body cleaning method described in Patent Document 1 supplies pressurized air to cleaning water that is ejected at a relatively low pressure and injects the air onto the surface of the vehicle body.

  On the other hand, in the vehicle body cleaning method disclosed in Patent Document 2, special cleaning particles that can enter fine irregularities are mixed in cleaning water that is ejected at a relatively low pressure, and pressurized air is supplied to the surface of the vehicle body for injection. It is something to be made.

JP 2000-317412 A JP 2006-61791 A

  According to the vehicle body cleaning methods disclosed in Patent Documents 1 and 2 above, dirt adhering to fine irregularities on the surface of the vehicle body can be cleaned with a low-pressure jet force, so that adverse effects of peeling of the coating film on the vehicle body are avoided. There are advantages you can do.

  However, any of the above vehicle body cleaning methods requires equipment for pressurizing air, and the cleaning method of Patent Document 2 requires special cleaning particles that can enter fine irregularities. There is a problem that the cleaning particles must be prepared.

  An object of the present invention is to provide a vehicle body cleaning method capable of efficiently cleaning a vehicle body with a minimum amount of equipment as well as avoiding the adverse effects of coating film peeling.

  In order to achieve the above-mentioned object, the present invention achieves the above-described object by causing a cleaning liquid to be jetted to clean dirt on the surface of a vehicle body. The bubble cleaning liquid is ejected toward the surface of the vehicle body.

  As described above, the bubble cleaning liquid collides with the surface of the vehicle body even when jetting the bubble cleaning liquid at a low pressure by ejecting the bubble cleaning liquid onto the surface of the vehicle body by naturally sucking the gas and generating the bubble cleaning liquid. Sometimes a shear force generated at right angles to the collision direction, a shock wave generated by the destruction of bubbles, or a secondary generated by partial destruction due to high pressure due to contraction of bubbles exposed to shock waves A shock wave or a compression wave can act on the surface of the vehicle body and fine irregularities to remove dirt. As a result, it is possible to obtain a vehicle body cleaning method capable of efficiently cleaning the vehicle body with a minimum amount of equipment as well as avoiding the adverse effects of coating film peeling.

  A first embodiment of a vehicle body washing apparatus according to the present invention will be described below based on the railway vehicle body washing apparatus shown in FIGS.

  The vehicle body cleaning device according to the present embodiment is roughly divided into a plurality of cleaning liquid injection nozzle groups 3A and 3B installed on both sides of the vehicle 1 on rails 1A and 1B installed in the cleaning site, and these cleaning liquid injections. Finishing liquid jet nozzle groups 4A and 4B installed on the vehicle traveling side with respect to the nozzle groups 3A and 3B, and dry gas jet nozzle groups 5A and 5B installed on the vehicle traveling side with respect to the finishing liquid jet nozzle groups 4A and 4B. Cleaning liquid splash protection walls 6A and 6B provided so as to surround each of these nozzle groups, raw water storage tank 7, and cleaning liquid tank 9 into which raw water is injected from the raw water storage tank 7 via the raw water injection pump 8. The detergent liquid tank 11 for injecting detergent into the cleaning liquid tank 9 via the detergent injection pump 10, the stirrer 12 for mixing the raw water and the detergent liquid in the cleaning liquid tank 9, and the cleaning liquid tank 9 Cleaning The cleaning liquid pump 13 which is a pressurizing means for supplying the cleaning liquid spray nozzle groups 3A and 3B with a necessary spray pressure and the raw water in the raw water storage tank 7 are required for the finishing liquid spray nozzle groups 4A and 4B. A finishing liquid pump 14 to which an injection pressure is supplied and supplied, a gas compressor 15 to supply a drying gas to the dry gas injection nozzle groups 5A and 5B with a necessary injection pressure, and an operation of each pump A cleaning control device 16 for adjusting the ejection order and ejection pressure of each nozzle by controlling the stop and the rotation speed, and a compressor control device 17 for regulating the pressure of the gas compressor 15 are provided.

  In the above-described configuration, when the vehicle 2 is self-running at low speed in the direction of the arrow in FIG. 5 and enters the vehicle, a vehicle detection sensor (not shown) detects the vehicle 2 and receives the detection signal to receive the cleaning control device 16. Operates the cleaning liquid pump 13 to eject the cleaning liquid obtained by diluting the detergent liquid with raw water from the cleaning liquid injection nozzle groups 3A and 3B and spray the cleaning liquid onto the vehicle 2. By spraying the cleaning liquid, dirt attached to the vehicle body of the vehicle 2 is cleaned and removed. When the vehicle 2 further advances and comes immediately before the finishing liquid injection nozzle groups 4A and 4B, a vehicle detection sensor (not shown) detects the vehicle 2, and the cleaning control device 16 receives the detection signal and the cleaning control device 16 And the raw water is jetted from the finishing liquid jet nozzle groups 4A and 4B and sprayed onto the vehicle 2. By spraying the raw water, the dirt that has floated and adhered from the vehicle body of the vehicle 2 and the remaining cleaning liquid are washed away. When the vehicle 2 further advances and comes immediately before the dry gas injection nozzle groups 5A and 5B, a vehicle detection sensor (not shown) detects the vehicle 2, and upon receiving the detection signal, the compressor control device 17 turns the gas compressor 15 on. The dry gas jet nozzle groups 5A and 5B are operated to blow dry gas and spray it onto the vehicle 2. Since the raw water adhering to the vehicle body of the vehicle 2 is blown away by blowing the dry gas, the vehicle body is dried.

  It should be noted that the operation of each pump can be stopped in order by detecting that the vehicle 2 has passed through the various nozzle groups by a vehicle detection sensor (not shown). Further, when the passing speed of the vehicle is a preset speed, various nozzles may be operated and stopped by a timer or the like.

  Incidentally, as shown in FIG. 5, a plurality of the cleaning liquid spray nozzle groups 3A and 3B are installed in the traveling direction of the vehicle 2, and the cleaning liquid spray nozzle groups 3A and 3B are arranged in the cleaning liquid as shown in FIG. A pipe header 18 connected to the pump 13 and installed in the vertical direction, a plurality of flexible pipes 19 connected to the pipe header 18, and a plurality of the flexible pipes 19 supported at positions separated from the pipe header 18. A pipe support fitting 20 and an injection nozzle 21 provided at each tip of the flexible pipe 19. As shown in FIG. 4, the flexible pipe 19 can adjust the distance from each injection nozzle 21 in accordance with the vehicle body shape of the vehicle 2 by deforming the distal end side of the pipe support fitting 20 as shown in FIG. 4.

  And as shown in FIG.1 and FIG.2, the injection nozzle 21 is connected to the front-end | tip of the flexible piping 19, and is supplied with the washing | cleaning liquid supply port 22 which supplies raw | natural water, and gas by the liquid flow supplied from this washing | cleaning liquid supply port 22, For example, a gas (outside air) supply port 23 that naturally sucks outside air, and a bubble cleaning solution generation chamber 24 that generates bubble cleaning solution by colliding the outside air supplied from the gas supply port 23 with the cleaning solution supplied from the cleaning solution supply port 22. And a spout 25 for ejecting the bubble cleaning liquid generated in the bubble cleaning liquid generation chamber 24.

  In order to efficiently generate the bubble cleaning liquid by mixing the cleaning liquid and the outside air in the bubble cleaning liquid generation chamber 24, a plurality of throttle holes 26A and 26B for forming a plurality of cleaning liquid jets are provided. An orifice 27 is provided between the cleaning liquid supply port 22 and the bubble cleaning liquid generation chamber 24. The throttle holes 26 </ b> A and 26 </ b> B are formed to be inclined so that a plurality of jets of the cleaning liquid collide between the bubble cleaning liquid generation chamber 24 and the jetting mouth 25. With this configuration, the cleaning liquid can generate a micro disturbance while drawing the outside air in the bubble cleaning liquid generation chamber 24, and can generate fine bubbles by mixing the generated pressure and mix it with the cleaning liquid.

  When the cleaning liquid pressurized by the cleaning liquid pump 13 is supplied to the jet nozzle 21 configured in this way, the outside air is naturally sucked from the gas supply port 23 by the cleaning liquid ejected at a high speed from the plurality of throttle holes 26A and 26B. And introduced into the bubble cleaning liquid generation chamber 24. The introduced outside air collides with the cleaning liquid to generate a bubble cleaning liquid in which bubbles are mixed.

  Then, as shown in FIG. 7, when the bubble cleaning liquid 29 including the bubbles 28 is injected from the injection nozzle 21 onto the vehicle body surface 2W of the vehicle 2 to collide, first, the direction is changed and flows along the vehicle body surface 2W. Since the bubble cleaning liquid 29 acts as a shearing force, dirt is scraped off. Further, the dirt can be similarly removed by the shearing force generated in the process in which the bubbles 28 are collided with the vehicle body surface 2W and destroyed. Furthermore, a shock wave 28F is generated by expansion / contraction of the bubble 28 with a large amplitude, and another bubble exposed to the shock wave 28F contracts to generate a high pressure, thereby also removing the dirt on the vehicle body surface 2W. Can do.

  By the way, the bubble cleaning liquid generation chamber 24 is a closed narrow space, and the particles of the cleaning liquid that have flowed out of the throttle holes 26A and 26B and collided therewith before reaching the throttle holes 26A and 26B due to the kinetic energy of the collision. The size is reduced to 1/10 or less of the particles of the cleaning liquid. Since the surface free energy that is the source of the surface tension of the cleaning liquid is energy per area, the smaller the area, the smaller the energy and the more stable. The formation of fine bubbles means that the air is covered with a film of a cleaning liquid having a hard shell surface tension, and the distance (standoff) between the jet outlet 25 and the vehicle body surface 2W where the cleaning action is effective. Therefore, it shows an effective detergency against dirt solids adhering to the vehicle body surface 2W at the time of collision.

  In addition, the normal injection nozzle called a flat nozzle and the injection nozzle of the gas-liquid two-layer flow by this embodiment are compared with the cleaning liquid of the injection nozzle by this embodiment, when the particle | grains of the cleaning liquid injected are compared. Since the particles are ejected in a state of being reduced to a few tenths or less as compared with a normal injection nozzle, it shows an effective destructive force against dirt in fine irregularities, and the cleaning effect is large. . Moreover, when comparing the area where the cleaning liquid from the injection nozzle collides with the vehicle body surface 2W, in other words, the cleaning area, the distribution of impact force of the normal injection nozzle shows a steep mountain shape with the center of the jet flow as the apex. On the other hand, the distribution of the impact force of the spray nozzle according to the present embodiment is substantially uniform over the entire cleaning region, strictly speaking, a trapezoid whose periphery is steeply lowered, so that no cleaning spots are generated. If the distribution of impact force is a steep mountain shape with the center of the jet at the top, depending on the injection pressure applied, the cutting force at the center will increase, causing the paint on the body surface 2W to break, There is a risk that raw water may enter the mounted equipment box. For this reason, when the injection pressure is lowered, the cutting force is reduced, and thus the above problem is solved. However, the ability to cut dirt is also reduced, so that it is difficult to set the injection pressure. However, in this embodiment, instead of increasing the jetting pressure of the cleaning liquid, the cleaning effect can be enhanced as described above by using the shearing force and shock wave accompanying the collapse of the bubbles.

  As described above, according to the present embodiment, it is possible to avoid the adverse effect of coating film peeling without using equipment for pressurizing air or dedicated cleaning particles, and to efficiently clean the vehicle body. it can.

  By the way, when the several injection nozzle 21 is arranged in the up-down direction, as shown in FIG. 8, since the washing | cleaning liquid 30 which finished washing | cleaning from upper direction flows down into the vehicle body surface 2W in layers, it is located below There is a possibility that the bubble cleaning liquid 29 from the injection nozzle is prevented from traveling to the vehicle body surface 2W by being prevented from proceeding by the fouling liquid 30.

In such a case,
(1) When the distance between the cleaning liquid spray nozzle groups 3A adjacent to each other in the traveling direction of the vehicle 2 and the distance between the adjacent cleaning liquid spray nozzle groups 3B are narrow, the installation position of the spray nozzle 21 in the height direction between the adjacent cleaning liquid spray nozzle groups change.

By changing the height of the installation position of the injection nozzle 21 in this way, it is possible to avoid jetting the bubble cleaning liquid to a position before the fouling liquid 30 flows down on the vehicle body surface 2W of the vehicle 2 that has moved.
(2) In the same cleaning liquid jet nozzle group 3A, 3B, the jet nozzles 21 adjacent to each other in the vertical direction are displaced, for example, staggered in the vehicle movement direction.

By installing the injection nozzles 21 in a staggered manner in this manner, even if the amount of the contaminated liquid 30 flowing down is large, the bubble cleaning liquid can be ejected while avoiding the position where the dirty liquid 30 flows down.
(3) In the same cleaning liquid injection nozzle group 3A, 3B, the injection angles of the injection nozzles 21 adjacent in the vertical direction are inclined so that they are on the front side and the rear side in the moving direction of the vehicle. Change.

In this way, by changing the injection direction of the vertically adjacent injection nozzles 21, the cleaning position of the vehicle body surface 2 </ b> W by the vertically adjacent injection nozzles 21 is different, so that the bubble cleaning liquid is ejected while avoiding the position where the contaminated liquid 30 flows down. In the above description, the bubble cleaning liquid 29 is obtained by diluting a detergent solution with raw water. However, it is not always necessary to use the detergent liquid. You may wash | clean by utilizing the shear force and shock wave accompanying a collapse. Conversely, instead of mixing the detergent solution into the raw water, a surfactant or a detergent may be mixed alone or mixed into the raw water. In order to improve the cleaning effect, the cleaning liquid may be heated to 20 to 60 ° C.

  Furthermore, although the example in which the spray nozzle 21 that naturally sucks outside air is applied only to the cleaning liquid spray nozzle groups 3A and 3B has been described, the above-described spray nozzle 21 is also used in the finish liquid spray nozzle groups 4A and 4B. The rinsing effect can be improved by generating the bubble cleaning liquid 29 using only raw water as the liquid and washing away the fouling liquid 30 remaining on the vehicle body surface 2W.

  In addition, in the above description, the cleaning liquid spray nozzle groups 3A and 3B, the finish liquid spray nozzle groups 4A and 4B, and the dry gas spray nozzle groups 5A and 5B are installed at positions facing both side surfaces of the vehicle 2, respectively. However, in order to perform the cleaning including the roof of the vehicle 2, the arrangement of the injection nozzles 21 in each of the injection nozzle groups is matched to the cross-sectional shape of the vehicle 2 as shown in FIGS. 9 and 10. Multiple installations.

  Furthermore, the leading vehicle and the trailing vehicle have different cross-sectional shapes at the front end portion and the rear end portion. Therefore, it is desirable to displace it so as to keep the distance from the vehicle body surface substantially constant. If a sensor for detecting a change in the vehicle cross-sectional shape is provided and the injection nozzle 21 is displaced in conjunction with the output of the sensor, the injection nozzle is automatically adjusted in accordance with the change in the vehicle cross-sectional shape as the vehicle moves. 21 can be displaced.

  FIG. 11 shows a second embodiment of the vehicle body washing apparatus according to the present invention. Since the shape of the injection nozzle 21 is the same as that of the first embodiment, detailed description is omitted again.

  In the present embodiment, raw water or a cleaning liquid mixed with a cleaning liquid or a surfactant is supplied from a cleaning liquid pump 13 (FIG. 6) via a flexible hose (not shown) such as a high-pressure rubber hose. 31 includes a plurality of spray nozzles 21 to form a cleaning liquid spray nozzle group, and the pressure header 31 is swung by a rocking device 32.

  By oscillating the pressure header 31 by the oscillating device 32 in this way, the plurality of injection nozzles 21 can be oscillated as a group of injection nozzles, so that the bubble cleaning liquid 29 can be sprayed over a wide range to be cleaned. This can reduce the number of injection nozzles installed. Efficient cleaning can be performed by changing the swinging direction according to the cleaning position of the vehicle body and the moving direction of the vehicle. Instead of swinging the pressure header 31, the spray nozzle 21 may be swinged individually. At this time, the spraying operation of each spray nozzle 21 is swung in the opposite direction between adjacent spray nozzles or the range of swing is changed, so that the bubble cleaning liquid is sprayed onto the surface of the vehicle body by the contaminated liquid. It can be prevented from being hindered. Needless to say, such oscillation of the injection nozzle can be applied to the finishing liquid injection nozzle groups 4A and 4B and the dry gas injection nozzle groups 5A and 5B.

  In each of the above embodiments, the vehicle body cleaning device for a railway vehicle has been described as an example of the vehicle body cleaning device. However, it goes without saying that the embodiment can also be applied to a vehicle body cleaning device for an automobile.

The perspective view which shows the injection nozzle by this invention. FIG. 2 is a partially longitudinal side view of FIG. 1. The perspective view which shows the detail of the injection nozzle group which assembled the injection nozzle of FIG. The perspective view which shows the practical example of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a vehicle body cleaning apparatus for a railway vehicle that is a first embodiment of a vehicle body cleaning apparatus according to the present invention. FIG. 6 is a block diagram of FIG. The schematic diagram of the bubble cleaning liquid injected from the injection nozzle by this invention. The schematic diagram of the bubble cleaning liquid and the fouling liquid which were injected. The schematic side view which shows the positional relationship of a vehicle and an injection nozzle. Sectional drawing of FIG. Schematic which shows the injection nozzle group which is 2nd Embodiment of the vehicle body washing apparatus by this invention.

Explanation of symbols

  1A, 1B ... Rails 1A, 1B, 2 ... Vehicle, 2W ... Body surface, 3A, 3B ... Cleaning liquid injection nozzle group, 4A, 4B ... Finishing liquid injection nozzle group, 5A, 5B ... Dry gas injection nozzle group, 6A, 6B DESCRIPTION OF SYMBOLS: Cleaning liquid splash protection wall, 7 ... Raw water storage tank, 8 ... Raw water injection pump, 9 ... Cleaning liquid tank, 10 ... Detergent injection pump, 11 ... Detergent liquid tank, 12 ... Stirrer, 13 ... Cleaning liquid pump, 14 ... Finishing liquid pump, DESCRIPTION OF SYMBOLS 15 ... Gas compressor, 16 ... Cleaning control apparatus, 17 ... Compressor control apparatus, 18 ... Pipe header, 19 ... Flexible piping, 20 ... Pipe support metal fitting, 21 ... Injection nozzle, 22 ... Cleaning liquid supply port, 23 ... Gas (outside air) Supply port, 24 ... Bubble cleaning liquid generation chamber, 25 ... Jet, 26A, 26B ... Restriction hole, 27 ... Orifice, 28 ... Bubble, 28F ... Shock wave, 29 ... Bubble cleaning liquid, 30 ... Fouling liquid, 3 ... pressure header 32 ... rocking device.

Claims (12)

  When cleaning the body surface by injecting the cleaning liquid from the spray nozzle, gas is naturally sucked into the spray nozzle by using the flow rate of the cleaning liquid, and the sucked gas collides with the cleaning liquid in the spray nozzle. A method of cleaning a vehicle body, comprising generating a bubble cleaning liquid and ejecting the bubble cleaning liquid toward the surface of the vehicle body from an injection nozzle.   The vehicle body cleaning method according to claim 1, wherein the cleaning liquid before colliding with the gas is raw water or a mixed liquid of raw water and a detergent.   The cleaning method according to claim 1, wherein the bubble cleaning liquid is sprayed while the spray nozzle is swung.   The injection nozzle for injecting the cleaning liquid to clean the surface of the vehicle body includes a cleaning liquid supply port for supplying the cleaning liquid, a gas supply port for naturally sucking the gas by the flow of the cleaning liquid supplied from the cleaning liquid supply port, and the gas A bubble cleaning liquid generation chamber that generates a bubble cleaning liquid by colliding gas sucked from the supply port with the liquid supplied from the cleaning liquid supply port, and a jet outlet that ejects the bubble cleaning liquid generated in the bubble cleaning liquid generation chamber An injection nozzle comprising:   The injection nozzle according to claim 4, wherein an orifice having a throttle hole for forming a plurality of jets of the cleaning liquid is provided between the cleaning liquid supply port and the bubble cleaning liquid generation chamber.   6. The jet according to claim 5, wherein the plurality of throttle holes are formed to be inclined so that a plurality of jets of the cleaning liquid collide between the bubble cleaning liquid generation chamber and the jet outlet. nozzle.   In a vehicle body cleaning apparatus for cleaning dirt on the surface of a vehicle body by injecting a cleaning liquid to which an injection pressure is applied by a pressurizing means, the cleaning liquid injection nozzle group including a plurality of injection nozzles for injecting the cleaning liquid, and a finishing liquid is injected A finish liquid spray nozzle group including a plurality of spray nozzles and a dry gas spray nozzle group including a plurality of spray nozzles for spraying dry gas, and at least the cleaning liquid spray nozzle group and the finish liquid spray nozzle The spray nozzles of the cleaning liquid spray nozzle group include a cleaning liquid supply port that supplies the cleaning liquid from the pressurizing unit, a gas supply port that naturally sucks gas by the flow of the cleaning liquid supplied from the cleaning liquid supply port, and the gas supply A bubble cleaning liquid generation chamber for generating a bubble cleaning liquid by colliding gas sucked from the mouth with the cleaning liquid supplied from the cleaning liquid supply port, and generation of the bubble cleaning liquid In vehicle washing apparatus is characterized in that a spout for ejecting the generated bubble cleaning liquid.   In a vehicle body cleaning apparatus for cleaning dirt on the surface of a vehicle body by injecting a cleaning liquid to which an injection pressure is applied by a pressurizing means, the cleaning liquid injection nozzle group including a plurality of injection nozzles for injecting the cleaning liquid, and a finishing liquid is injected A finish liquid spray nozzle group including a plurality of spray nozzles and a dry gas spray nozzle group including a plurality of spray nozzles for spraying dry gas, and at least the cleaning liquid spray nozzle group and the finish liquid spray nozzle The spray nozzles of the cleaning liquid spray nozzle group include a cleaning liquid supply port that supplies the cleaning liquid from the pressurizing unit, a gas supply port that naturally sucks gas by the flow of the cleaning liquid supplied from the cleaning liquid supply port, and the gas supply A bubble cleaning liquid generation chamber for generating a bubble cleaning liquid by colliding gas sucked from the mouth with the cleaning liquid supplied from the cleaning liquid supply port, and generation of the bubble cleaning liquid In a spout for ejecting the generated bubble cleaning fluid, and body cleaning apparatus characterized in that a rocking device for rocking the injection direction from the injection nozzle.   9. The vehicle body cleaning apparatus according to claim 8, wherein the swinging device swings the spray nozzles of the cleaning liquid spray nozzle group.   9. The vehicle body washing apparatus according to claim 8, wherein the rocking device rocks the cleaning liquid spray nozzle group.   11. The vehicle body washing apparatus according to claim 7, 8, 9, and 10, wherein the jet nozzles arranged in the vertical direction of the cleaning liquid jet nozzle group are arranged in a staggered manner with respect to a moving direction of the vehicle.   11. The vehicle body washing apparatus according to claim 7, 8, 9, and 10, wherein the injection nozzles arranged in the vertical direction of the cleaning liquid injection nozzle group are arranged to be inclined with respect to the vehicle body surface.

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