JP2007186912A - Road surface cleaning apparatus and road surface cleaning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-void road surface cleaning apparatus which is of an air blowing type and improved in dust removing and recovering ability. <P>SOLUTION: The road surface cleaning apparatus 1 has suction ports 10' arranged so as to be opposed to a high-void road surface S; a parallel air blowing section 13 which generates a parallel air flow Fp moving on the high-void road surface S in a direction almost in parallel with the high-void road surface S; a front air blowing section 11 arranged on the front side of the suction ports 10'; and a rear air blowing section 12 arranged on the rear side of the same. An air flow Ff blowing from the front air blowing section 11 and an air flow Fr blowing from the rear air blowing section 12 collide against each other at a location above a parallel air flow Fp to generate an air flow Fu flowing upward. Therefore dust Sb on the high-void road surface S is removed by an air flow Fv generated by negative pressure formed by the parallel air flow Fp, and introduced to the suction ports 10' by the air flow Fu flowing upward. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a road surface cleaning device and a road surface cleaning method for removing and collecting dust and dirt in a surface of a paved road surface and a gap.

  As such a road surface cleaning device and a road surface cleaning method, a type in which a water flow is jetted toward the road surface has been generally used (see, for example, Patent Documents 1 and 2).

  The apparatus disclosed in Patent Document 1 is arranged with a main water jet nozzle installed at an inclination angle of 7 to 13 degrees with respect to the road surface, and is disposed on both sides of the main water jet nozzle, and is inclined with respect to the road surface. The left and right sub-water jet nozzles are inclined at an angle of 7 to 13 degrees and installed inward at substantially the same angle on the main water jet nozzle side. In addition, a jet water collection box disposed in front of the confluence of jet water jetted from each water jet nozzle, and a pump for pumping the water collected in the collection box into a separate recovery tank And a water pump for supplying water from the separation / recovery water tank to each water jet nozzle. Further, the jumping air jet nozzles arranged inward at substantially the same angle toward the confluence on both sides of the jet water channels of the left and right auxiliary water jet nozzles, and the air for supplying air to the jump water jet nozzles And a supply pump.

  The airflows injected inward from the left and right jump water jet nozzles merge before the confluence of the jet water from the left and right sub-water jet nozzles, and the jet water jumps upward. ing. The splashed jet water is urged toward the collection box by the jet water from the main water jet nozzle and collected.

  Moreover, the apparatus disclosed by patent document 2 is provided with the water supply apparatus, air supply apparatus, and watering collection | recovery part which faced the pavement surface in the cleaning space formed in a vehicle lower surface. The water feeding device is disposed at the front and back positions of the sprinkling recovery unit. The air supply device is respectively disposed in front of the front water supply device and behind the rear water supply device. An air supply pipe constituting a part of the air supply device is disposed in a state orthogonal to the traveling direction of the vehicle. In this air supply pipe, a plurality of air jet nozzles are arranged in a straight line at a desired interval. The air outlet of each air ejection nozzle is formed in a linear slit shape.

  The air outlets of the air ejection nozzles located at the longitudinal center portions of the front and rear air supply pipes are formed in a horizontal horizontal straight line.

  In addition, the air outlet of the front air ejection nozzle is formed while changing the angle in the clockwise direction as it moves to the right from the center, and the air outlet located at the farthest position is formed at an angle before the vertical straight line, and As the distance from the center increases to the left, the angle is changed in the counterclockwise direction, and the air outlet located at the farthest position is formed at an angle in front of the vertical straight line.

  On the other hand, the air outlet of the rear air ejection nozzle is formed while changing the angle in the clockwise direction as it goes farther to the right than the center, and the air outlet present at the farthest position is formed at an angle before the vertical straight line, Further, the air outlet is formed while changing the angle in the clockwise direction as it moves farther to the left than the center, and the air outlet located at the farthest position is formed at an angle before the vertical straight line.

  The water outlets of the front and rear water supply devices are configured in the same manner as the air outlets of the front and rear air supply devices. The walls of the air exiting from the front and rear air outlets are formed in parallel to the walls of the water exiting from the front and rear watering outlets. Thereby, the water which came out of the sprinkling outlet is guided toward the inside of the cleaning space by the air from the air outlet, and is recovered through the sprinkling recovery part.

  In such a water jet type road surface cleaning device, it is necessary to provide a tank for storing water, a mechanism for preventing water scattering, etc., and it was difficult to reduce the size and weight of the device. Problems have been pointed out that the working distance is greatly limited, and that a large driving force is required to move the apparatus.

  In recent years, in order to solve such problems, a road surface cleaning device of a type that ejects air instead of water has been developed and attracts attention.

  For example, in Patent Document 3, a suction duct having a single suction port for sucking in earth and sand, dust, and the like, and a front side of the suction duct are disposed adjacent to the front side in the traveling direction, and air is blown perpendicularly to the pavement surface. An apparatus for improving the removal efficiency of dust and the like by forming an air layer having a pressure higher than atmospheric pressure below the air blowing surface of the air blowing apparatus and generating an air flow toward the suction port. Is disclosed.

  In addition, the same document describes a configuration in which air ejection devices are provided on both the front side and the rear side of the suction duct in order to reduce the remaining of dust and the like. In addition, in order to prevent the air from the air ejection surface from directly flowing into the suction port, or to suppress the outflow of air from the air ejection surface, the air is ejected in an oblique direction from a part of the air ejection surface Is also described.

  However, since this conventional air ejection type road surface cleaning device needs to have a large-sized air ejection surface as described in FIG. 2 of Patent Document 3 and paragraph [0009] of the specification, it goes to the suction port. In order to generate airflow satisfactorily, it is necessary to provide a very powerful blower, which increases the device size and weight.

  Moreover, since the road surface cleaning apparatus of patent document 3 is comprised so that air may be ejected from many small holes formed in the air ejection surface, in order to maintain the removal capability and collection capability of dust etc., these It is necessary to stably generate a good air flow toward the suction port by ejecting a constant air flow from a large number of small holes all at once. However, it is difficult to control the air flow to be ejected from a large number of small holes arranged on the surface.

  In Non-Patent Document 1, air is ejected from the nozzles disposed on both sides of the suction port toward the road surface, and the air flow from both sides is collided at a position below the suction port and is directed upward toward the suction port. The structure which made it generate | occur | produce the air flow to is disclosed (refer FIG.-2, FIG.-3, FIG.-4 of a nonpatent literature 1).

  Further, the same document discloses a configuration in which covers for guiding the air flow sucked from the suction port are formed before and after the vehicle traveling direction in order to improve dust collection capability, and the shape of the cover is streamlined. (See FIG. 4 of Non-Patent Document 1).

JP-A-6-228926 JP 2002-146738 A Japanese Patent Laid-Open No. 2005-48421 Takashi Sakuma, 4 others “Examination of dust collection method for low noise pavement function maintenance vehicle”, 60th Annual Scientific Lecture Summary Collection (CD-ROM), Section V, Japan Society of Civil Engineers, 2005 September

  FIG. 9A is a schematic cross-sectional view showing the state of the road surface S of drainage pavement (low noise pavement). The drainage pavement is formed including aggregate Sa having a predetermined particle size. The gaps between the aggregates Sa are filled with gap clogging (dust) Sb. The main purpose of the road surface cleaning device is to remove the gap clogging material Sb.

  As described in Non-Patent Document 1, when an air flow is ejected toward the road surface S from directions facing each other, each air flow F has a velocity component Fd in the vertically downward direction as shown in FIG. Have. This velocity component Fd acts to compress the void clogging material Sb from above and stay in the void, and in some cases acts to move the void clogging material Sb to a deeper void. Therefore, it is difficult to say that the removal capability of the void clogging material Sb by the configuration disclosed in Non-Patent Document 1 is sufficient.

  Furthermore, if the covers for guiding the air flow are formed before and after the traveling direction of the vehicle, the size and weight of the apparatus increase, and there is a risk that the cost increases due to an increase in the amount of fuel used during the cleaning operation.

  This invention is made | formed in view of such a situation, and it aims at providing the technique which can improve the dust removal capability and collection | recovery capability in an air jet type road surface cleaning operation | work.

  In order to achieve the above-mentioned object, the invention according to claim 1 includes air jetting means for jetting air toward the road surface, and a suction port arranged to face the road surface, and the jetted air A suction unit that sucks dust removed from the road surface through the suction port, and performs a cleaning operation while advancing on the road surface, wherein the air ejection unit is substantially parallel to the road surface. A first air jetting means for generating a parallel air flow that moves on the road surface in a direction, and provided on both sides of the suction port, and collides with the air jetted from both sides at a position above the parallel air flow A pair of second air ejecting means for ejecting air obliquely downward, respectively.

  The invention according to claim 2 is the road surface cleaning device according to claim 1, wherein the first air ejection unit is configured to be in the suction port with respect to one of the pair of second air ejection units. The air is ejected at an angle larger than the air ejection angle by the second air ejection means with respect to the vertically lower side.

  Moreover, invention of Claim 3 is the road surface cleaning apparatus of Claim 2, Comprising: The said 1st air ejection means is air at an angle between 50 degrees-70 degrees with respect to the perpendicular downward direction. It is characterized by ejecting.

  Moreover, invention of Claim 4 is the road surface cleaning apparatus of Claim 2 or Claim 3, Comprising: A said 2nd air ejection means is between 30 degrees-40 degrees with respect to the perpendicular downward direction. It is characterized by ejecting air at an angle.

  The invention according to claim 5 is the road surface cleaning device according to any one of claims 2 to 4, wherein the first air ejection means is in the traveling direction with respect to the suction port. The second air ejecting means is disposed on each of the front side and the rear side, and the second air ejecting means is disposed on the front side. The air jetting means jets air toward the lower rear side, and the second air jetting means disposed on the rear side jets air toward the lower front side.

  The invention according to claim 6 is the road surface cleaning device according to claim 5, wherein the second air ejecting means disposed on the rear side is disposed on the front side. The air is ejected with a larger air volume than the air ejecting means.

  The invention according to claim 7 is the road surface cleaning device according to claim 6, wherein the air volume blown from the second air blowing means disposed on the front side, and the rear side The ratio with the air volume of the air ejected from the second air ejecting means disposed in the space is between 3: 4 and 1: 3.

  The invention according to claim 8 is the road surface cleaning device according to any one of claims 5 to 7, wherein the amount of air blown from the first air blowing means is It is characterized by being approximately half of the air volume of the air ejected from the second air ejecting means disposed on the rear side.

  The invention according to claim 9 is the road surface cleaning device according to any one of claims 5 to 8, wherein the suction means is arranged in a direction orthogonal to the traveling direction. A plurality of the suction ports, wherein each of the first air ejection means and the second air ejection means generates an air flow passing through a lower position of each of the plurality of suction ports. To do.

  The invention according to claim 10 is the road surface cleaning device according to claim 9, wherein the first air ejection means and / or the second air ejection means are slit-like extending in the orthogonal direction. The air is ejected from the air outlet.

  Moreover, invention of Claim 11 is the road surface cleaning apparatus as described in any one of Claims 1-10, Comprising: The dust removed from the road surface by the air ejected from the said air ejection means disperses. It is further provided with the scattering suppression means which suppresses this.

  In the invention according to claim 12, the air is ejected toward the road surface while traveling on the road surface, and the dust removed by the ejected air is collected through a suction port disposed facing the road surface. A road surface cleaning method for generating a parallel air flow that moves on the road surface in a direction substantially parallel to the road surface, and causing air to collide at a position above the parallel air flow. Thus, the second air ejection step of ejecting air from both sides of the suction port obliquely downward is performed at the same time.

  The invention according to claim 13 is the road surface cleaning method according to claim 12, wherein the first air ejection step is one of the air ejected from the both sides by the second air ejection step. The parallel air by ejecting air from a position opposite to the suction port and ejecting air at an angle larger than the air ejection angle in the second air ejection process with respect to the vertical downward direction. It is characterized by generating a flow.

  The invention according to claim 14 is the road surface cleaning method according to claim 13, wherein the first air ejection step is directed from the rear side toward the lower front side in the traveling direction with respect to the suction port. Air is ejected, and the second air ejecting step ejects air from the front side toward the lower rear side and ejects air from the rear side toward the lower front side.

  The invention according to claim 15 is the road surface cleaning method according to claim 14, wherein the plurality of suction ports are arranged in a direction orthogonal to the traveling direction, and the first air Each of the ejection step and the second air ejection step generates an air flow that passes through a lower position of each of the plurality of suction ports.

  The present invention generates a parallel air flow that moves on the road surface in a direction substantially parallel to the road surface, and obliquely downwards from both sides of the suction port so as to collide air at a position above the parallel air flow. Each is configured to eject air. As a result, the pressure in the parallel air flow becomes lower than the pressure in the space between the road surface and an air flow (air flow due to negative pressure) from the road surface toward the parallel air flow is generated. Dust such as a clogging material on the road surface is sucked upward from the space by the air flow caused by the negative pressure. Moreover, the air flow collided at the lower position of the suction port forms an upward air flow. The dust removed from the road surface by the suction force of the air flow due to the negative pressure is guided to the suction port by the upward air flow. Therefore, according to the present invention, in the air jet type road surface cleaning operation, it is possible to improve the dust removal capability by the parallel air flow, and to improve the dust collection capability by the upward air flow.

  An example of a preferred embodiment of a road surface cleaning device according to the present invention will be described in detail with reference to the drawings.

  In the following description, the clogging material, sand, earth, dust, and the like that are removed and collected from the road surface by the road surface cleaning device may be collectively referred to as “dust on the road surface”.

[Device configuration]
The structure of the road surface cleaning apparatus of this embodiment is demonstrated with reference to FIGS. FIG. 1 is a side view showing an outline of the overall configuration of the road surface cleaning device 1 of the present embodiment, and FIG. FIG. 3 is a side view showing a schematic configuration of an air ejection means and a suction means.

  The road surface cleaning device 1 is configured as a self-propelled device integrated with a vehicle. However, the road surface cleaning device according to the present invention is not limited to this, and is connected to the rear portion of the vehicle, for example. However, it can be configured as a device that performs a cleaning operation.

  As shown in FIG. 1, the road surface cleaning device 1 according to the present embodiment generates an air flow with a dust removing / recovering unit 2 that moves in the state of being close to the road surface S and removes and collects dust on the road surface S. And a tank 4 for separating and storing the collected dust from the air flow, and a suction device 5 for generating a suction force. The tank 4 is provided with a baffle plate, a mesh member, and the like for stirring the air flow and separating the dust (not shown).

  The air flow generated by the blower 3 is supplied to the dust removal and recovery unit 2 through the blower pipe 3a.

  The dust removal / recovery unit 2 and the tank 4 are connected via a suction pipe 4a. The tank 4 and the suction device 5 are communicated with each other via a communication pipe 5a. The suction force generated by the suction device 5 acts to the dust removal / recovery unit 2 through the communication pipe 5a, the tank 4 and the suction pipe 4a, and guides the collected dust to the tank 4.

[Dust removal and collection unit]
The configuration of the dust removing and collecting unit 2 will be described in detail with reference to FIGS. The configuration shown in both figures may be stored in the housing or exposed.

  As shown in FIGS. 2 and 3, the dust removal and collection unit 2 includes a suction unit 10 that sucks dust, a front air ejection unit 11 disposed on the front side of the suction unit 10 in the vehicle traveling direction, and a suction unit. A rear air ejection portion 12 disposed on the rear side of the vehicle traveling direction 10 and a position opposite to the suction portion 10 with respect to the rear air ejection portion 12, that is, a rear side of the rear air ejection portion 12 in the vehicle traveling direction. And a parallel airflow jetting portion 13 disposed at the position.

  Here, the suction unit 10 (and the suction device 5) corresponds to an example of the “suction unit” of the present invention. The front air ejection part 11, the rear air ejection part 12, and the parallel air flow ejection part 13 each correspond to an example of the “air ejection means” of the present invention. Moreover, the parallel airflow ejection part 13 corresponds to an example of the “first air ejection part” of the present invention, and each of the front air ejection part 11 and the rear air ejection part 12 is a “second air ejection part”. This corresponds to an example.

(Suction part)
As shown in FIG. 2, the suction unit 10 includes a plurality (eight in this case) of suction units 10 </ b> A to 10 </ b> H arranged in a direction orthogonal to the vehicle traveling direction. Each suction part 10A-10H has suction hood parts 10a-10h whose bottom faces the road surface S, and suction pipe parts 10a'-10h 'connected to the upper ends of the suction hood parts 10a-10h.

  The bottom surfaces of the suction hood portions 10a to 10h are opened, and suction ports facing the road surface S are formed. The suction ports of the suction hoods 10a to 10h may be collectively referred to as a suction port 10 ′ (see FIG. 3).

  The side walls of the suction hood portions 10a to 10h are inclined at a vertical or near vertical angle. In the former case (vertical), the side surfaces of the suction hood portions 10a to 10h are formed in a rectangular shape, and in the latter case, the side surfaces are formed in a trapezoidal shape. In addition, it is also possible to use a side wall having a shape whose inclination angle changes midway, such as a curved surface shape or a refractive shape.

  Each suction pipe portion 10a 'to 10h' has one end connected to the suction hood portions 10a to 10h and the other end connected to the suction pipe 4a (not shown). In addition, it is good also as a structure which connected the other end of each suction pipe part 10a '-10h' directly to the tank 4. FIG. In any case, it is only necessary that the suction ports 10 ′ of the suction units 10 </ b> A to 10 </ b> H communicate with the inside of the tank 4.

(Front air ejection part)
The front air ejection portion 11 ejects an air flow for removing dust on the road surface S below the suction port 10 ′ and / or in front of the vehicle traveling direction from the nozzle 11 a. The nozzle 11a has a slit-like air outlet that extends in a direction perpendicular to the vehicle traveling direction (that is, the vehicle width direction).

  The air flow generated by the blower 3 is supplied to the front air jetting part 11 through the blower pipe 3a. The front air ejection part 11 ejects this air flow from the nozzle 11a. As shown in FIG. 3, the nozzle 11 a is formed so as to eject an air flow backward and downward in the vehicle traveling direction. The airflow from the front air ejection part 11 is ejected in a direction A (direction toward the position S1 on the road surface S in FIG. 3) that makes an angle θf rearward with respect to the vertical downward direction D.

  According to the test conducted by the present inventor, the air flow ejection angle θf is preferably set to an angle of 60 ° or less, and is set to an angle between 30 ° and 40 ° (for example, 35 °). Is more desirable. When the angle θf increases (for example, up to about 60 °), the dust removing ability by the air flow is almost lost. Moreover, if the angle θf is about 40 ° or less, the dust removal capability of the airflow is sufficiently exhibited. On the other hand, when the angle θf is smaller than about 30 °, it is difficult to allow an air flow to flow under the suction port 10 ′ due to the device configuration.

  The angle θf (particularly the minimum value) is set depending on the positional relationship (distance) between the suction port 10 ′ and the nozzle 11a, and is not limited to the above range. That is, the angle θf only needs to be an angle at which an air flow is ejected toward the position S1 near the front side of the suction port 10 ′ in the vehicle traveling direction.

  A scattering suppression plate 14 is disposed on the front side of the front air ejection part 11 in the vehicle traveling direction. The scattering suppression plate 14 is a plate-like member made of an elastic material such as rubber. The scattering suppression plate 14 is disposed so as to form a slight gap between the lower end thereof and the road surface S. Further, it is desirable that the scattering suppression plate 14 is formed in a shape that is curved backward from the upper side to the lower side in the vehicle traveling direction. Further, the scattering suppression plate 14 is attached so as not to form a gap with the front air ejection part 11 such as directly attached to the front air ejection part 11. The scattering suppression plate 14 corresponds to an example of “scattering suppression means” of the present invention.

(Rear air outlet)
The rear air ejection portion 12 ejects an air flow for removing dust on the road surface S below the suction port 10 ′ and / or rearward in the vehicle traveling direction from the nozzle 12 a. Similar to the nozzle 11a, the nozzle 12a has a slit-like air jet port extending in the vehicle width direction.

  The air flow generated by the blower 3 is supplied to the rear air jetting part 12 through the blower pipe 3a and jetted from the nozzle 12a. As shown in FIG. 3, the nozzle 12a is formed so as to eject an air flow forward and downward in the vehicle traveling direction. The air flow from the rear air ejection part 12 is ejected in a direction B (a direction toward the position S2 on the road surface S in FIG. 3) that forms an angle θr forward with respect to the vertical downward direction D.

  The air flow ejection angle θr is desirably an angle of 60 ° or less, and is about 30 ° to 40 ° (for example, 35 °), similarly to the air flow ejected from the front air ejection portion 11. It is more desirable to set.

  This angle θr (particularly the minimum value) is set depending on the positional relationship (distance) between the suction port 10 ′ and the nozzle 12 a and is not limited to the above range. That is, the angle θr only needs to be an angle at which an air flow is ejected toward a position S2 near the rear side in the vehicle traveling direction of the suction port 10 ′.

  A scattering suppression plate 15 similar to the front scattering suppression plate 14 is disposed on the rear side of the rear air ejection portion 12 in the vehicle traveling direction. It is desirable that the scattering suppression plate 15 is formed in a shape that is curved forward from the upper side to the lower side in the vehicle traveling direction.

  Further, a scattering suppression cover 16 is disposed in a substantially horizontal direction at a position behind and above the rear air ejection portion 12. The scattering suppression cover 16 is a plate-like member made of an elastic material such as rubber. The scattering suppression cover 16 has an end on the front side in the vehicle traveling direction connected to the rear air ejection part 12 and a rear end and the parallel airflow ejection part 13 form a predetermined gap. It is arranged.

(Parallel air flow ejection part)
The parallel airflow ejection part 13 ejects air for generating an airflow (parallel airflow) moving on the road surface S in a direction substantially parallel to the road surface S from the nozzle 13a. The air ejected from the parallel airflow ejecting section 13 also acts to suppress the dust removed from the road surface S by the rear air ejecting section 12 from flying backward in the vehicle traveling direction. Similarly to the nozzles 11a and 12a, the nozzle 13a forms a slit-like air outlet that extends in the vehicle width direction.

  The airflow generated by the blower 3 is supplied to the parallel airflow ejection unit 13 through the blower tube 3a. The parallel airflow ejection part 13 ejects this airflow from the nozzle 13a. As shown in FIG. 3, the nozzle 13a is formed so as to eject an air flow forward and downward in the vehicle traveling direction. The airflow from the parallel airflow ejection portion 13 is ejected in a direction C (a direction toward the position S3 on the road surface S in FIG. 3) that makes an angle φ forward with respect to the vertical downward direction D.

  According to the test conducted by the present inventor, the air flow ejection angle φ is desirably set to an angle between about 50 ° and 70 ° (for example, 60 °). The air ejection angle φ is adjusted by the ejection direction changing plate 17 attached in the vicinity of the nozzle 13a. The ejection direction changing plate 17 is a plate-like member made of a material having elasticity such as rubber, and one end thereof is connected to the parallel airflow ejection portion 13.

  The angle φ is set depending on the positional relationship (distance) between the nozzle 13a and the lower end of the scattering suppression plate 15, and is not limited to the above range. In other words, the angle φ may be an angle at which an air flow is ejected toward the position S3 near the rear of the lower end of the scattering suppression plate 15.

  The air ejected from the parallel airflow ejection section 13 passes through the gap between the lower end of the scattering suppression plate 15 and the road surface S, and generates a parallel airflow that moves forward in the vehicle traveling direction substantially parallel to the road surface S. Form.

(Dust removal principle)
The principle of dust removal on the road surface by such a road surface cleaning device 1 will be described. FIG. 4A shows an aspect of the air flow generated by the road surface cleaning device 1. The airflows Ff, fr, and Fp are airflows formed by air ejected from the front air ejection part 11, the rear air ejection part 12, and the parallel airflow ejection part 13, respectively. In particular, the air flow Fp is the aforementioned parallel air flow.

  As shown in the figure, a parallel air flow Fp is formed at a position closest to the road surface S in a direction substantially parallel to the road surface S. Above the parallel air flow Fp, air flows Ff and fr are formed obliquely downward from the front-rear direction. The air flows Ff and fr collide at a position below the suction port 10 ', and generate an air flow Fu upward, that is, toward the suction port 10'.

  Since the parallel air flow Fp moves substantially parallel to the road surface S, the pressure in the space (including the space between the aggregates Sa) between the parallel air flow Fp and the road surface S and the parallel air flow Fp There is a difference in pressure. That is, as shown in FIG. 4B, the pressure in the parallel air flow Fp is lower than the pressure in the space with the road surface S. As a result, an air flow (air flow due to negative pressure) Fv from the road surface S toward the parallel air flow Fp is generated.

  The gap clogging material Sb is sucked upward from the gap by the air flow Fv due to the negative pressure. The gap clogging Sb removed from the gap by this suction force is moved to the parallel air flow Fp, and further guided to the suction port 10 'by the upward air flow Fu.

  As described above, the present embodiment does not attempt to remove the void clogging material Sb from the inside of the gap by the air flow from obliquely upward as in the conventional case, but the gap clogging by the negative pressure due to the air flow substantially parallel to the road surface S. The object Sb is sucked and removed, and air is ejected from both sides of the suction port 10 'to generate an upward air flow, thereby leading to the removal of the void clogging material Sb to the suction port 10'. Is.

(About the airflow of air flow)
By adjusting the air volume of the air flow ejected from each of the ejection portions 11, 12, and 13, it is possible to improve the dust removal and recovery capability. When the air volume of the air flow from the front air ejection section 11 is represented by Vf, the air volume of the air flow from the rear air ejection section 12 is represented by Vr, and the air flow of the air flow from the parallel air ejection section 13 is represented by Vp. In the embodiment, the ratio of these air volumes is set to Vf: Vr: Vp = 1.5: 2: 1.

  According to the test conducted by the present inventors, it was found that it is desirable to set the air volume Vr from the rear air ejection section 12 to be larger than the air volume Vf from the front air ejection section 11 (Vr> Vf). Furthermore, by setting the ratio of the air volume Vf from the front air ejection section 11 and the air volume Vr from the rear air ejection section 12 to a value between Vf: Vr = 3: 4 to 1: 3, dust can be efficiently collected. It was found that it can be removed and recovered. It was also confirmed that this ratio was not significantly affected by the vehicle running speed (up to about 25 km / h).

[Operation]
Operation | movement of the road surface cleaning apparatus 1 of this embodiment comprised as mentioned above is demonstrated. The road surface cleaning device 1 performs dust cleaning work while traveling on the road surface S.

  When the operator performs a predetermined operation, the blower 3 and the suction device 5 start to operate. The airflow generated by the blower 3 is supplied to the front air jetting part 11, the rear air jetting part 12, and the parallel airflow jetting part 13 through the blower pipe 3a. The suction force generated by the suction device 5 acts on the suction portions 10A to 10H through the communication pipe 5a, the tank 4 and the suction pipe 4a, and air is sucked through the suction ports 10 '.

  The airflow ejected from the parallel airflow ejection section 13 passes through the gap between the scattering suppression plate 15 and the road surface S to form a parallel airflow Fp, and generates an airflow Fv due to negative pressure with the road surface S. Let The void clogging Sb on the road surface S is sucked up by the air flow Fv due to this negative pressure. Further, dust, dirt, etc. existing on the road surface S are also sucked up by this air flow Fv.

  From the front air ejection part 11, the airflow Ff is ejected toward the position S1 on the road surface S. This air flow Ff enters the space below the suction port 10 'from the front. On the other hand, an air flow Fr is ejected from the rear air ejection part 12 toward a position S2 on the road surface S. This air flow Fr enters the space below the suction port 10 'from behind. The air flow Ff from the front and the air flow Fr from the rear collide with each other at a position below the suction port 10 ′ to form an upward air flow Fu.

  The clogging material Sb and dust sucked up from the road surface S by the air flow Fv due to the negative pressure are sucked up by the upward air flow Fu formed by the air flows Ff and Fr and guided to the suction port 10 '. The air flow including the dust guided to the suction port 10 'is guided to the tank 4 through the suction pipe 4a. The dust is separated by a baffle plate or the like in the tank 4 and stored in the tank 4.

  In addition, the airflow ejected from the parallel airflow ejection portion 13 toward the position S3 passes through the gap between the lower end of the scattering suppression plate 15 and the road surface S, so that dust or the like removed from the road surface S is rearward. It acts to suppress scattering.

  Note that the operation of the scattering suppression plates 14 and 15 and the scattering suppression cover 16 will be described in the section of [Operation / Effect] described later.

[Specific configuration example]
Here, a specific configuration example of the present embodiment will be described.

  In this configuration example, as described above, the eight suction portions 10A to 10H are arranged in the vehicle width direction, and the width of each suction portion 10A to 10H, that is, each suction port 10 'is a square shape having a diameter of 300 mm × 300 mm. And

  Further, the air flow ejection angles θf and θr of the front air ejection section 11 and the rear air ejection section 12 are set to 35 °, and the air flow ejection angle φ of the parallel air flow ejection section 13 is set to 60 °.

  Moreover, the slit width of the nozzle 11a of the front air ejection part 11 is set to 1.5 mm, the slit width of the nozzle 12a of the rear air ejection part 12 is set to 2 mm, and the slit width of the nozzle 13a of the parallel airflow ejection part 13 Is set to 1 mm.

  In addition, the front air ejection part is set so that the distance between the air blowing position S1 from the front air ejection part 11 and the air blowing position S2 from the rear air ejection part 12 (the air blowing position interval L) is 400 mm. 11 and the position of the rear air ejection part 12 are set. At this time, the suction port 10 ′ is disposed at an intermediate position between the front air ejection part 11 and the rear air ejection part 12. Therefore, the horizontal interval between the blowing position S1 of the front air ejection portion 11 and the suction port 10 'is set to 50 mm, and the horizontal interval between the blowing position S2 of the rear air ejection portion 12 and the suction port 10' is also 50 mm. Set to

  About the parallel airflow ejection part 13, it arrange | positions so that the ventilation position S3 of the airflow may be located 200 mm behind the ventilation position S2 of the rear air ejection part 12 (just below the upper end of the scattering suppression plate 15).

  Further, the scattering suppression cover 16 is disposed so that the rear end thereof forms a gap of about 10 mm with respect to the parallel airflow ejection portion 13.

[Comparison with conventional machines]
FIG. 5 shows a comparison result between the dust collection efficiency of the road surface cleaning device configured as described above and the configuration of the conventional machine. In addition, the thing of the structure which ejects an airflow only from one direction was used for the conventional machine. In the comparative test, there are three types in which the conditions of the width of the suction port 10 ′ (suction part width), the number of suction parts 10 (number of cells), and the distance between the front and rear blowing positions S 1 and S 2 (blower position) The dust collection efficiency of the above configuration was compared with the conventional machine corresponding to the traveling speed of the cleaning vehicle. The suction part width means the width of the suction port 10 'in the vehicle traveling direction.

  In the first configuration, the suction part width = 300 mm, the number of cells = 8, and the blowing position interval = 400 mm. In the second configuration, the suction part width = 300 mm, the number of cells = 4, and the blowing position interval = 400 mm. In the third configuration, the suction part width = 165 mm, the number of cells = 4, and the blowing position interval = 160 mm. These first to third configurations have the configurations according to the present invention. Moreover, the 4th structure is an apparatus structure of the conventional machine which ejects an airflow only from one direction.

  As can be seen from the results of this comparative test, the first to third configurations exhibit a good dust recovery rate in the entire traveling speed range as compared with the conventional machine. In particular, when the traveling speed is around 10 km / h, the difference between the first to third configurations and the conventional machine is large.

  When the road surface is cleaned at a traveling speed of 10 km / h or higher, there is no need to perform lane regulation. Therefore, according to the 1st-3rd structure, since dust collection | recovery efficiency when performing a work | work without restricting a lane is favorable, it can carry out a work | work without interrupting traffic so much and is convenient.

  Further, even during high-speed work near a traveling speed of 20 km / h, the first to third configurations exhibit a better dust collection rate than conventional machines.

  Note that the conventional machine to be compared in the comparative test ejects an air flow with half the air volume of the first to third configurations, but the dust collection efficiency is 2 even if the air volume is simply doubled. It does not increase until double. For example, the difference in the dust recovery rate between the first configuration and the conventional machine in the vicinity of the traveling speed of 10 km / h in FIG. 5 is about three times, but the first configuration is recovered even if the air volume of the conventional machine is doubled. It can be seen that the rate is not much. Even at a traveling speed of about 25 km / h, the difference between the first configuration and the conventional machine is about 2.5 times, and the air volume of the conventional machine cannot be doubled.

  Other merits of the configuration according to the present invention that can be read from the graph of FIG. 5 will be described in the following [Operation / Effect] section.

[Action / Effect]
The operation and effect of the road surface cleaning device 1 according to the present embodiment configured as described above will be described.

  First, the road surface cleaning device 1 generates a negative air pressure Fv between the road surface S and the road surface S by forming a parallel air flow Fp that moves on the road surface S in a direction substantially parallel to the road surface S. The air flow Fv sucks up the clogging material Sb on the road surface S.

  As a result, it is possible to effectively remove the void clogging material Sb without blowing air from above and causing the void clogging material Sb to stay in the void or move to a deeper void as in the prior art. Can do.

  In the present embodiment, the parallel airflow ejection portion 13 is disposed on the rear side in the traveling direction of the apparatus. This increases the air flow Fv due to negative pressure by increasing the relative velocity of the parallel air flow Fp with respect to the road surface S, thereby improving the dust removal capability.

  Further, the parallel air flow Fp also has an action of suppressing an adverse effect exerted on the road surface S by the air flows Ff and Fr from the front air ejection part 11 and the rear air ejection part 12. That is, as described with reference to FIG. 9B, the velocity component in the vertically lower direction of the airflows Ff and Fr compresses the gap clogging material Sb from above and stays in the gap. Depending on the case, the gap clogging material Sb may be moved to the gap in the deep part of the road surface. However, according to the present embodiment, the air flows Ff and Fr are blocked by the parallel air flow Fp, so that such adverse effects are suppressed. can do.

  Further, the road surface cleaning device 1 includes a front air ejection portion 11 on the front side of the suction port 10 ′ and a rear air ejection portion 12 on the rear side. The air flows Ff and Fr ejected from each collide at a position above the parallel air flow Fp, and generate an air flow Fu toward the suction port 10 '.

  As shown in FIG. 6, the air flow Fu acts to collect and remove the dust removed from the road surface S. In the present embodiment, a suction port 10 ′ is disposed above the air flow Fu. Thereby, the dust removed from the road surface can be collected and collected effectively.

  Thus, according to the road surface cleaning device 1 of the present embodiment, it is possible to improve the dust removal capability by the parallel air flow Fp and improve the dust collection capability by the upward air flow Fu.

  Moreover, according to this embodiment, it is comprised so that an airflow may be ejected from a slit-shaped air ejection port instead of ejecting an airflow from a "surface" like the apparatus of the above-mentioned patent document 3. Therefore, it is possible to suppress an increase in the size and weight of the device.

  Moreover, according to this embodiment, since effective dust removal / recovery can be realized, it is not necessary to form the suction means in a special shape unlike the apparatus shown in Non-Patent Document 1 (FIG. 4). Therefore, according to the present embodiment, it is possible to improve the dust removal capability and the recovery capability without increasing the size and weight of the apparatus.

  Since the front air ejection part 11 and the rear air ejection part 12 of the road surface cleaning device 1 of the present embodiment are configured to eject air at an angle of 30 ° to 40 ° with respect to the vertically downward direction, the suction port 10 The dust on the road surface S can be effectively removed while allowing the air flow to enter the space below the ′.

  Further, by making the air volume from the rear air ejection section 12 larger than the air volume from the front air ejection section 11, dust that is blown backward due to the influence of the movement of the vehicle can be effectively guided to the suction port 10 '. . In particular, based on the result of the test conducted by the present inventor, the ratio of the air volume from the front air ejection section 11 and the air volume from the rear air ejection section 12 is set to about 3: 4 to 1: 3, so that It is possible to optimize the removal ability and recovery ability of It has been found from tests that the ratio of the air volume before and after this is not affected by the traveling speed (working speed) of the vehicle.

  Further, the dust ejected from the parallel air flow ejection portion 13 is further prevented from flying backward by the dust removed by the air flow from the rear air ejection portion 12, thereby further improving the dust removal and recovery operations. We are trying to improve. In addition, the parallel airflow ejection part 13 is comprised so that air may be ejected at an angle larger than the airflow from the rear air ejection part 12 (an angle of 50 ° to 70 ° with respect to the vertical downward direction). Thereby, the dust blown backward can be effectively pushed back.

  Further, it is possible to sufficiently exert the action of pushing back dust blown backward by setting the air volume of the airflow from the parallel airflow ejection section 13 to about half of the airflow from the rear air ejection section 12. It was confirmed by a test conducted by a person.

  Furthermore, the road surface cleaning device 1 of the present embodiment includes scattering suppression plates 14 and 15 on the front side of the front air ejection part 11 and the rear side of the rear air ejection part 12, respectively.

  Since the front air ejection part 11 ejects the air flow Ff obliquely rearward with respect to the vehicle traveling direction, as shown in FIG. 7, the front air ejection part 11 is located below the front air ejection part 11 in front of the blowing position S1. A vortex flow Ef is generated in the space. This vortex Ef acts so that the dust removed from the road surface S by the front air ejection portion 11 stays in the space, and prevents the dust from being guided to the suction port 10 '. In the present embodiment, the scattering suppression plate 14 is disposed on the front side of the front air ejection portion 11 to suppress the generation of the eddy current Ef and the forward scattering of the dust, thereby improving the dust removal capability and the recovery capability. I am trying.

  On the other hand, since the rear air ejection part 12 ejects the air flow Fr obliquely forward with respect to the vehicle traveling direction, as shown in FIG. 7, the rear air ejection part 12 on the rear side from the air blowing position S2. The eddy current Er is generated in the space below. This eddy current Er acts so that the dust removed from the road surface S by the rear air ejection part 12 stays in the space, and prevents the dust from being guided to the suction port 10 '. In the present embodiment, the scattering suppression plate 15 is disposed on the rear side of the rear air ejecting portion 12, and the generation of the eddy current Er and the scattering of dust to the rear are suppressed, thereby improving the dust removal capability and the recovery capability. I am trying.

  Further, a scattering suppression cover 16 is disposed above the space between the rear air ejection portion 12 and the parallel airflow ejection portion 13 of the present embodiment. The scattering suppression cover 16 has no gap with respect to the rear air ejection portion 12 and is disposed with a predetermined gap with respect to the parallel airflow ejection portion 13. Since the airflow from the parallel airflow ejection part 13 is ejected toward the rear position (air blowing position S3) of the scattering suppression plate 15, from the space between the rear air ejection part 12 and the parallel airflow ejection part 13 It is necessary to escape, and the predetermined gap plays a role.

  Moreover, if the structure which open | released the upper direction of the space between the rear air ejection part 12 and the parallel airflow ejection part 13 without providing this scattering suppression cover 16, the flow of the air in the said space will be disturbed, As a result, the action of the airflow from the parallel airflow ejection portion 13 is reduced, and the dust removal capability is reduced. That is, the scattering suppression cover 16 acts to adjust the air flow in the space between the rear air ejection portion 12 and the parallel airflow ejection portion 13, thereby improving the dust removal capability.

  The road surface cleaning device 1 of the present embodiment is not provided with a single large suction port as in Patent Document 3 described above, for example, but is provided with a plurality of suction portions (cells) 10A to 10H, each having a small suction port 10. The configuration provided with 'is applied. By using the suction port 10 'having such a small diameter, the suction force is substantially uniform over the entire diameter, and the suction performance is improved. That is, when the aperture is large, there is a large difference between the suction force in the vicinity of the center of the aperture and the suction force in the vicinity of the periphery, and the suction capability cannot be exhibited sufficiently. However, the aperture of the suction port 10 'is reduced as in this embodiment. By reducing the size, effective suction can be performed.

  Further, as can be seen from the test results of FIG. 5, dust can be collected more effectively in the case of eight suction ports 10 'than in the case of four suction ports 10'. In the present embodiment, the dust collection capability is improved by providing eight suction portions 10A to 10H.

  As described above, it is desirable to arrange the suction portions in the vehicle width direction when arranging a plurality of suction portions. This is because a wide range on the road surface S can be cleaned at a time by arranging the plurality of suction portions in the vehicle width direction (that is, the direction orthogonal to the moving direction of the road surface cleaning device). Instead of arranging a plurality of suction portions in a row in the vehicle width direction, it is also possible to arrange them in a plurality of rows (for example, two rows).

  The mode of air ejection from the front air ejection portion 11 and the rear air ejection portion 12 is configured to correspond to the arrangement of the plurality of suction ports 10 ′. That is, the front air ejection part 11 and the rear air ejection part 12 are configured to eject air from an air ejection port disposed in the vehicle width direction. Thereby, it is possible to generate an air flow rising toward the suction port 10 ′ by colliding the air flow from the front and rear in the space below each suction port 10 ′. Further, the parallel air flow ejection portion 13 is also configured so that the parallel air flow Fp passes through the position below each suction port 10 '.

  In addition, the form of the air outlet of the front air ejection part 11, the rear air ejection part 12, and the parallel airflow ejection part 13 is limited to the slit-like air ejection outlet extending in the vehicle width direction as in this embodiment. Instead, for example, a configuration in which a plurality of air jets are arranged in the vehicle width direction can be applied. In that case, it is desirable to provide air outlets at positions before and after each suction port 10 '.

  In addition, a generally used fan-shaped nozzle or the like can be used as the air outlet of the front air outlet 11 or the like, but in consideration of the merits such as less reduction in air ejection pressure and less uneven cleaning. Thus, it is considered desirable to apply a slit-shaped air jet.

  As described above, the side walls of the suction hood portions 10a to 10h of the suction portions 10A to 10H of the present embodiment are inclined at an angle that is vertical or nearly vertical. That is, as shown in FIG. 8, the angle ψ formed by the side wall 10a ″ of the suction hood portion 10a of the suction portion 10A (the same applies to the suction portions 10B to 10H) with respect to the vertically downward D is 0 ° or an angle close to 0 °. (Hereinafter referred to as “substantially 0 °”).

  In the prior art, in order to suck an air flow or a water flow from a wider range, the angle ψ of the suction hood portion is often set large. However, according to a test conducted by the present inventor, it was confirmed that the dust collection ability by the suction portion is improved by setting the angle ψ to be substantially 0 °.

  As the reason, the following reason peculiar to dust collection using an air flow can be considered. The dust contained in the air flow is easily separated from the air flow when the air flow is agitated (note that the dust in the water flow is difficult to separate unless it is filtered). When the side wall angle ψ of the suction hood part is large, the air flow traveling upward collides with the side wall and greatly reflects in the downward and horizontal directions to cause agitation, and the contained dust is separated from the air flow and the road surface It falls on S. However, by setting the side wall angle ψ to be substantially 0 °, the reflection component in the lower and horizontal direction of the air flow by the side wall is reduced. Thereby, generation | occurrence | production of stirring is suppressed and the dust collection capability by a suction part is improved.

[Modification]
The road surface cleaning apparatus according to the present invention is not limited to the specific configuration detailed in the above embodiment. For example, in addition to the modifications mentioned in the description of the above-described embodiment, various modifications within the scope of the gist of the present invention as described below can be made as appropriate.

  In the above embodiment, the parallel air flow ejection portion 13 is provided on the rear side in the traveling direction of the apparatus to increase the air flow Fv due to the negative pressure, but the parallel air flow ejection portion is disposed on the front side in the traveling direction. You may do it. It is also possible to apply a configuration in which parallel airflow ejection portions are disposed on both the front side and the rear side in the traveling direction.

  Moreover, in the said embodiment, although the structure which each arrange | positioned the air ejection part on both sides of the suction port was used, for example, it was set as the structure which provided the air ejection part on both sides in the vehicle width direction across the suction port, for example. In addition, it is possible to generate an air flow that rises toward the suction port. More generally, it suffices to arrange the air ejection portions on both sides in any direction across the suction port so that the air ejected from both sides collides in the space below the suction port. However, the configuration of the above embodiment is considered to be optimal in consideration of the moving direction of the road surface cleaning device (vehicle traveling direction) and the enlargement of the cleanable area.

  Moreover, it can comprise so that the ejection direction (ejection angle with respect to the vertical downward direction D) of the air from an air ejection part can be changed suitably. As an example of the method, a mechanism for changing the mounting angle of the front air ejection part 11 in the configuration of the above embodiment may be provided, or a mechanism for changing the angle of the nozzle 11a may be provided. The same applies to the rear air ejection part 12 and the parallel air flow ejection part 13.

  The shape of the suction port is not limited to a square shape as in the above embodiment, and any shape such as a rectangular shape or a circular shape can be appropriately employed. Also, one or a plurality of arbitrary numbers of suction ports can be provided. When a plurality of suction ports are provided, it is not necessary to configure each suction port with an individual cell as in the above embodiment, and a cell having a plurality of suction ports can be used.

It is a schematic side view showing the whole structure of suitable embodiment of the road surface cleaning apparatus which concerns on this invention. It is a schematic perspective view showing the external appearance structure of the air ejection means and suction means in suitable embodiment of the road surface cleaning apparatus which concerns on this invention. It is a schematic side view showing the external appearance structure of the air ejection means and suction means in suitable embodiment of the road surface cleaning apparatus which concerns on this invention. It is a schematic explanatory drawing for demonstrating the dust removal capability and collection | recovery capability of suitable embodiment of the road surface cleaning apparatus which concerns on this invention. It is a graph which shows the test result which compared the dust removal capability and collection | recovery capability of suitable embodiment of the road surface cleaning apparatus which concerns on this invention. It is a schematic explanatory drawing for demonstrating the generation | occurrence | production state of the upward airflow in suitable embodiment of the road surface cleaning apparatus which concerns on this invention. It is a schematic explanatory drawing for demonstrating the generation | occurrence | production state of the vortex | eddy_current in the suitable embodiment of the road surface cleaning apparatus which concerns on this invention, and its suppression mechanism. It is a schematic explanatory drawing for demonstrating the structure of the suction means in suitable embodiment of the road surface cleaning apparatus which concerns on this invention. It is the schematic for demonstrating the removal aspect of the dust by the conventional road surface cleaning apparatus. FIG. 9A is a schematic cross-sectional view showing the structure of the road surface and the state of void clogging. FIG. 9B is a schematic cross-sectional view illustrating a dust removal mode by a conventional road surface cleaning device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Road surface cleaning apparatus 2 Dust removal collection part 3 Air blower 3a Air blower 4 Tank 4a Suction pipe 5 Suction apparatus 5a Communication pipe 10 (10A-10H) Suction part 10 'Suction port 10a-10h Suction hood part 10a'-10h' Suction Pipe part 11 Front air ejection part 12 Rear air ejection part 13 Parallel air flow ejection part 11a, 12a, 13a Nozzle 14, 15 Scattering suppression plate 16 Scattering suppression cover S Road surface Sa Aggregate Sb Air gap clogging S1 Air blow by front air ejection part Position S2 Blowing position S3 by the rear air jetting part S3 Blowing position Fp by the parallel airflow jetting part Parallel air flow Fv Air flow Fu due to negative pressure Fu

Claims (15)

An air ejection means for ejecting air toward the road surface;
A suction means having a suction port arranged to face the road surface, and sucking the dust removed from the road surface by the jetted air through the suction port;
A road surface cleaning device that performs a cleaning operation while advancing on the road surface,
The air jetting means
First air ejecting means for generating a parallel air flow that moves on the road surface in a direction substantially parallel to the road surface;
A pair of second air jets respectively provided on both sides of the suction port, each jetting air obliquely downward so that the air jetted from both sides collides at an upper position of the parallel air flow Means,
A road surface cleaning device comprising:   The first air ejecting means is provided at a position opposite to the suction port with respect to one of the pair of second air ejecting means, and the air by the second air ejecting means is vertically downward. The road surface cleaning device according to claim 1, wherein the air is ejected at an angle larger than the ejection angle.   3. The road surface cleaning device according to claim 2, wherein the first air ejecting means ejects air at an angle between 50 ° and 70 ° with respect to a vertically downward direction.   4. The road surface cleaning device according to claim 2, wherein the second air ejecting unit ejects air at an angle of 30 ° to 40 ° with respect to a vertically downward direction. 5. The first air ejecting means is disposed on the rear side in the traveling direction with respect to the suction port, and ejects air toward the front lower side,
The second air ejection means is disposed on each of the front side and the rear side, and the second air ejection means disposed on the front side ejects air toward the lower rear side, The second air ejecting means disposed on the rear side ejects air toward the lower front side;
The road surface cleaning device according to any one of claims 2 to 4, wherein   The said 2nd air ejection means arrange | positioned at the said back side ejects air with a bigger air volume than the said 2nd air ejection means arrange | positioned at the said front side. Road surface cleaning device.   The ratio of the air volume of air ejected from the second air ejecting means disposed on the front side and the air volume of air ejected from the second air ejecting means disposed on the rear side is: The road surface cleaning device according to claim 6, wherein the road surface cleaning device is between 3: 4 and 1: 3.   The amount of air blown from the first air blowing means is substantially half the amount of air blown from the second air blowing means disposed on the rear side. The road surface cleaning apparatus as described in any one of Claims 5-7. The suction means includes a plurality of the suction ports arranged in a direction orthogonal to the traveling direction,
Each of the first air ejecting means and the second air ejecting means generates an air flow that passes through a lower position of each of the plurality of suction ports.
The road surface cleaning apparatus as described in any one of Claims 5-8 characterized by the above-mentioned.   The road surface cleaning apparatus according to claim 9, wherein the first air ejection unit and / or the second air ejection unit ejects air from a slit-shaped air ejection port extending in the orthogonal direction.   The road surface cleaning device according to any one of claims 1 to 10, further comprising scattering suppression means for suppressing dust removed from the road surface from being scattered by air ejected from the air ejection means. . A road surface cleaning method in which air is ejected toward the road surface while traveling on the road surface, and dust removed by the ejected air is collected through a suction port disposed facing the road surface,
A first air ejection step for generating a parallel air flow that moves on the road surface in a direction substantially parallel to the road surface;
A second air ejection step for ejecting air from both sides of the suction port obliquely downward so as to collide air at an upper position of the parallel air flow;
A road surface cleaning method characterized in that   In the first air ejection step, air is ejected from a position opposite to the suction port with respect to one of the air ejected from the both sides in the second air ejection step, and vertically downward. 13. The road surface cleaning method according to claim 12, wherein the parallel air flow is generated by ejecting air at an angle larger than an air ejecting angle in the second air ejecting step. In the first air ejection step, air is ejected from the rear side in the traveling direction toward the front lower side with respect to the suction port,
The second air ejection step ejects air from the front side toward the lower rear side and ejects air from the rear side toward the lower front side.
The road surface cleaning method according to claim 13. A plurality of the suction ports are arranged in a direction orthogonal to the traveling direction,
Each of the first air ejection step and the second air ejection step generates an air flow that passes through a lower position of each of the plurality of suction ports.
The road surface cleaning method according to claim 14.

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