JPH068524B2 - How to clean the suction part of an air flow cleaning vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a so-called suction portion including a pickup head and a suction duct of an air flow cleaning vehicle that sucks up dust on the road by circulating air. .

2. Description of the Related Art Conventionally, as described in, for example, US Pat. No. 3,545,181, an air flow cleaning vehicle as described above uses blower air blown from a blower duct provided at the open end of a centrifugal dust separator. This air is supplied to the pickup head, and this air is vigorously blown from the orifice of the pickup head onto the road surface to suck the dust on the road and suck it into the hopper from the duct, and the air after carrying the dust in this way is centrifugal dust separated again. It is circulated to the device.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In an air flow cleaning vehicle that uses the circulating air, if the collected dust contains a large amount of particularly moist soil, the inside of the pickup head or the suction duct may have There has been a problem that the sediment is accumulated and the passage of the circulating air is narrowed, the air flow rate is reduced, and as a result, the suction pressure rises and the dust cannot be collected.

Means for Solving the Problems The present invention, in order to solve the above problems, in an air circulation cleaning vehicle of an air circulation type, water is injected into the pumping duct during air circulation, and this water is scattered by the air stream. At the same time, the pickup head is sucked into the hopper through the suction duct, and the inside of the pickup head and the suction duct are washed by the flow of the scattered water.

Function According to the above method, a large amount of water injected into the pumping duct during air circulation is dispersed over the entire width of the pickup head by the flow of the circulating air, and at the same time it is struck from the orifice to the road surface together with the air flow and inside the pickup head. Turn to every corner to wash away the sediment accumulated in the pickup head. Muddy water after cleaning the inside of the pickup head is sucked up vigorously from the suction duct,
At this time, the sediment deposited on the inner wall of the suction duct is washed away.

Example First, an outline of an air flow cleaning vehicle will be described with reference to FIGS. An underframe 2 is fixed on the left and right vehicle frames 1, and a centrifugal dust separating device 3 (hereinafter referred to as the dust separating device 3) is welded to the underframe 2 in a substantially horizontal state in the left-right direction. Dust separator 3
, The blower casing 4 is integrally welded to the open end of the blower casing 4, and the impeller 8 of the blower 7 is rotatably supported by the bearing 6 attached to the outer plate 5 of the blower casing 4, and the V pulley which is wedged to the shaft of the impeller 8. The V-belt 12 is suspended around the V-pulley 11 attached to the output shaft of the engine 10 and the engine 9, and the impeller 8 is rotated at high speed. An exhaust pipe 13 for discharging the circulating air is continuously provided on the outer side plate of the blower casing 4, and a regulator door 14 for adjusting the exhaust amount is pivotally supported at its opening so as to swing from an upright position that closes the opening to a fourth position. The fully open position shown by the dotted line in the figure can be freely controlled from the driver's seat. The lower end of the blower casing 4 is connected to the pressure feeding duct 15, and the pressure feeding duct 15 is connected to the pickup head 16.

A water injection pipe 150 for water injection is arranged near the connection portion with the pickup head 16 in the pressure supply duct 15, and the water injection pipe 150 is connected to a hose pipe 151 via a solenoid opening / closing valve 152, a pump 153, and a strainer 154. It is connected to the tank 91 by piping. The electromagnetic opening / closing valve 152 can be turned on / off by a switch in the driver's seat, and can be operated by the driver by the pressure display of a pressure gauge 155 arranged in the hopper 40 described later. Then, the amount of water from the water injection pipe 150 has a circulating air flow rate of 2
When it is about 00 m ³ / min, it is set to about 12 / min.
As the pressure gauge 155, for example, a precision pressure gauge using a diaphragm or a bellows in its pressure receiving portion is used.

As shown in FIG. 1, the pickup head 16 includes the left and right side plates 1.
7A and 17B are formed by bending the rear portion into a U-shape to form the top plate 18 also serving as the rear wall and the inside of the pickup head 16 into the upper chamber 2.
3 and the slanted partition plate 19 for partitioning into the lower chamber 24 are welded to each other to form a sheet metal structure, and front flaps 20 and 20 made of rubber are attached to the front edges of the top plate 18 and the partition plate 19, respectively, and the rear wall portion of the top plate 18 is attached. The rear flaps 21, 21 made of rubber are attached in parallel to the lower surface of the to prevent circulating air from leaking in the front-rear direction. The wind direction plate 2 is attached to the lower end of the top plate 18 which is bent in a U shape.
5, the bent curved surface 19A of the partition plate 19 and the wind direction plate 25 form a venturi orifice port 26.
Darts shoes 27 that move in contact with the road surface are bolted to the outside of the left and right side plates 17A and 17B, and the air blown out from the venturi orifice port 26 flows to both sides and backward inside the left and right side plates 17A and 17B. The air deflector 28 is attached so as not to exist. Since the pickup head 16 is constructed in this manner, the air sent from the pressure-feeding duct 15 flows from the right to the left in the upper chamber 23 in FIG. 4 and becomes a strong air flow from the orifice port 26 by the Venturi effect. The air blown toward the road surface and flowing into the lower chamber 24 flows from right to left, sucks up the dust on the road surface, and flows into the suction duct 30 connected to the upper surface of the partition plate 19. The pickup head 16 is suspended by a wire rope 33 attached to the tip of a support arm 32 attached to both ends of a shaft 31 rotatably supported by the underframe 2.
The support arm 32 of the shaft 31 is swung by the protruding and retracting of the piston rod of the hydraulic cylinder 34 attached to the underframe 2, and the shaft 31 is rotated by a predetermined amount. Therefore, when the cleaning is not performed, the piston rod of the hydraulic cylinder 34 projects and the supporting arm 32, which is directed downward, is horizontally swung to lift the pickup head 16 by a predetermined amount and move away from the road surface. The bracket 36 attached to the top plate 18 has a connecting rod 37 pivotally supported by the vehicle frame 1 so as to be swingable.
Are connected to hold the position of the pickup head 16 in the front-rear direction. The pipe mouth of the duct pipe 30A of the suction duct 30 is a curved pipe 4 attached to the inner wall surface of the front plate 41 of the hopper 40 which is an inclined surface as shown in FIG.
The air sucked up from the suction pipe 30 through the opening of the curved pipe 44 is discharged into the hopper 40.

The hopper 40 includes a top plate 46, a left side plate 47, a right side plate 48, a side plate 54, a bottom plate 49, a rear plate 50, a substantially vertical front plate 43, inclined front plates 41 and 42, and an upper part as a rear plate 50. It is a large room surrounded by a screwed tail door 51. The top plate 46, the left side plate 47, and the right side plate 48 extend forward from the hopper 40 and also serve as covers for covering the dust separating device 3, the engine 10, the water tank 91, and the like.
A screen 52 made of wire mesh or expanded metal is stretched over the upper part of the hopper 40 so that only fine dust (dust) passes through. Both ends of the stay member 53 bent into a U-shape are welded to the left side plate 47 and the side plate 54, and the stay member 53 has an inclined front plate 4.
The upper part of 2 is welded. The left end surface of the front plate 41 of the inclined surface is welded to the left side plate 47, the right end surface is welded to the side plate 54, and the lower part of the front plate 42 is the dust storage box 8 described later.
It is a zero bottom plate. The stay member 53 and the rubber plate 55 curved in a U shape on the mounting piece 42A protruding from the front plate 42.
Is installed. A contact plate 58 is welded like a frame around the four edges of the opening of the front plate 41 that serves as an air passage 57 through which air flows from the hopper 40 to the dust separation device 3.

The dust separating device 3 is provided with a suction port 60 extending in the longitudinal direction of its axis, and an arc-shaped guide plate 3A extends from the suction port so that air flows into the suction port 60 in the tangential direction of the cylinder. The dust separator 3 is formed in a 6-shaped cross section. A discharge port 62 is provided facing the upper portion of the front plate 42 in the longitudinal direction of the shaft center, and the discharge port 62 communicates with the dust storage box 80. Below the outlet 62 and the guide plate 3A
A dust packing 65 is attached to the tip of the above, and the contact plate 58 of the front plate 41 is pressed against the rubber packing 65 to prevent outside air from flowing into the hopper 40 and the dust storage box 80. The dust separator 3 is provided with a guide plate 66 for guiding the dust blown out by the centrifugal force of the spiral flow into the dust storage box 80.
The seal plate 67 is welded to the outer periphery of the guide plate 66 and the dust separating device 3, and the rubber plate 55 attached to the front plate 42 is pressure-bonded to the upper surface of the seal plate 67. The left side surface of the dust storage box 80 is closed by the side plate 67, and the lower end portion of the front plate 42, which is an inclined surface, is bent substantially vertically downward, and rubber is attached to a thin iron plate at the bent edge. A cover plate 68 is attached with bolts 69. Since there is no iron plate in the portion of the cover plate 68 to which the bolt is tightened, the cover plate 68 hangs in a freely openable / closable state as if attached by a hinge. The lower part of the front plate 41 of the inclined surface is bent substantially vertically as shown in FIG. 2 to form a vertical surface 41A, and the lower end is welded to the bottom plate 49. The cover plate 6 that is hanging when the blower 7 does not rotate
As shown by the phantom line in FIG. 2, an appropriate gap m is provided between the lower end of 8 and the vertical surface 41A, and when the blower 7 rotates and the dust separation device 3 becomes negative pressure, The negative pressure causes the cover plate 68 to be adsorbed to the vertical surface 41A and open to the hopper 40 of the dust storage box 80 to close the side surface. As described above, the dust storage box 80 of the present embodiment is constituted by the front plates 42, 41, the side plates 54, 67 and the lid plate 68, which are inclined surfaces, and the upper part thereof is a box sealed by the rubber plate 55. And communicates with the discharge port 62 of the dust separation device 3. In FIG. 3, 92 is a side guard, 93 is a gutta room, 94 is a gutta room driving hydraulic motor, and 95 is a dump support shaft for dumping the hopper 40.

When cleaning the road surface, the air sent out by the rotation of the blower 7 while the vehicle is running blows vigorously onto the road surface from the orifice port 26 of the pickup head, sucks the dust on the road surface from the suction duct 30, and sucks it up from the hopper 40.
Exhale to. The circulating air after the heavy trash such as stones and empty cans is directly stored in the hopper 40 is then supplied to the screen 52.
Through which light and large debris carried in the circulating air is removed. The dust-containing air that has passed through the screen 52 flows from the rear to the front, passes through the air passage 57, and is sucked into the dust separation device 3 through the suction port 60. The air sucked into the dust separation device 3 flows toward the impeller 8 while rotating in a spiral shape by the high speed rotation of the blower 7. At this time, the dust contained in the air is ejected from the discharge port 62 due to the centrifugal force of the swirling air, and is guided by the guide plate 66.
When the blower 7 is rotating as described above, the cover plate 68 is negatively pressed and the rear side surface 4
Since it is adsorbed on 1A, it is stored in the storage box 80.
As the dust is stored in the dust storage box 80, the pressure receiving area where the negative pressure acts on the cover plate 68 gradually decreases, and the suction force becomes weak. When the balance between the own weight of the stored dust 70 and the suction force of the cover plate 68 is lost, the dust 70 is removed by the cover plate 68.
Is pushed, the paper is instantly discharged into the hopper 40, and the lid plate 68 is again discharged.
Are adsorbed. That is, the cover plate 68 acts as if it were an automatic valve, and stores a predetermined amount of dust 70 in the storage box 80. Then, when the rotation of the blower 7 is stopped, the cover plate 68 is in a hanging state, so that the dust 70 in the storage box 80 falls into the hopper 40 through the gap m. In this way, the clean circulating air after the dust is separated by the dust separating device 3 is sucked into the blower 7 and is blown again to the blowout duct by the impeller 8.

In this way, the pickup head 16,
The dust is sucked into the hopper 40 through the suction duct 30, but when the moist soil adheres to the inside of the pickup head 16 and the suction duct 30, the air passage of the pickup head 16 and the suction duct 30 becomes gradually narrow. The amount of circulating air decreases, and the negative pressure (usually 300 mm to 400 mm water column) necessary for sucking up dust in the hopper 40 rises. When the negative pressure becomes about 600 mm to 800 mm water column, the suctioned state of the dust deteriorates. Therefore, the increase of the negative pressure is detected by the pressure gauge 155, the traveling of the vehicle is once stopped, and the cleaning of the road surface is stopped ( However, the pickup head 16 is kept grounded), the switch in the driver's seat is turned on, and the electromagnetic opening / closing valve 152 is opened. Then, a large amount of water is pressure-injected from the water tank 91 into the pumping duct 15 from the water injection pipe 150 via the pump 153. Then, this water is dispersed in the pickup head 16 along with the air flow over the entire width of the pickup head 16 and is struck on the road surface together with the air flow from the orifice port 26 (flow velocity is about 70 to 100 m / min). Is swung to every corner to wash away the sediment deposited in the pickup head 16. The muddy water after cleaning the inside of the pickup head 16 is vigorously sucked up from the suction duct 30, and at this time,
The sediment deposited on the inner wall of the suction duct 30 is washed away. When such a cleaning state is performed for about 5 to 10 minutes, the earth and sand adhering to the inner walls of the pickup head 16 and the suction duct 30 are almost completely removed, and the negative pressure in the hopper 40 returns to the water column of 300 mm to 400 mm, and again. Garbage collection will be secure once the vehicle starts running.

It should be noted that although the present embodiment has been described as having a dust storage box, it is needless to say that the present invention can also be applied to those without this.

As described above, the present invention is an air circulation type air flow cleaning vehicle, in which water is poured into the pressure feeding duct during air circulation, and the water is scattered by the air flow from the pickup head via the suction duct. The air is sucked into the hopper, and the flow of the scattered water is used to clean the suction part, that is, the inside of the pickup head and the suction duct, so it is possible to prevent the air flow rate of the suction part from decreasing by performing appropriate cleaning. You can prevent your ability from falling.

[Brief description of drawings]

FIG. 1 is a view best showing the present invention and is a sectional view taken along line IV-IV in FIG. 4, FIG. 2 is a sectional view taken along line III-III in FIG. 4, FIG. 3 is a side view of a cleaning vehicle, and FIG. FIG. 3 is a sectional view taken along line II-II, and FIG. 5 is a sectional view taken along line II of FIG. DESCRIPTION OF SYMBOLS 1 ... Vehicle frame, 3 ... Centrifugal dust separation chamber, 7 ... Blower, 8 ... Impeller, 15 ... Pumping duct, 16 ... Pickup head, 30 ... Suction duct, 40 ... Hopper, 91 ... Water tank, 150 ... Water injection pipe, 155 … Pressure gauge

Claims (1)

[Claims] 1. A hopper that circulates the blower air provided at the open end of a centrifugal dust separator with a pressure feed duct, a pickup head, a suction duct, and a centrifugal dust separator to suck up dust on the road with the pickup head. In an air-flow cleaning vehicle that stores in, water is injected into the pressure-feeding duct during air circulation, and while this water is scattered by the air flow, it is sucked from the pickup head into the hopper through the suction duct, and by this flow of scattered water. A method for cleaning a suction part of an air flow cleaning vehicle, characterized in that the inside of a pick-up head and a suction duct are cleaned.