JP2007303219A - Asphalt emulsion spraying device in asphalt finisher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save labor by automating the spray of an asphalt emulsion onto a step part in an asphalt pavement operation. <P>SOLUTION: An asphalt finisher comprises an extensible arm 14 slidable in the lateral direction of a vehicle body and a hydraulic motor 19 for driving the extensible arm. A range sensor unit 15 as a step position detection means is fitted to the end of the extensible arm, and an asphalt emulsion spray nozzle 17 is fitted thereto. An automatic control means controls the hydraulic motor 19 according to the values detected by the range sensor unit to extend and retract the extensible arm. The spraying direction of the asphalt emulsion spray nozzle is always toward the step portion. Consequently, since the manual spraying of the asphalt emulsion onto the step portion is eliminated, labor is saved and the nonuniformity of the spray of the emulsion is almost eliminated, the quality of pavement can be enhanced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an asphalt emulsion spraying apparatus in an asphalt finisher, and more particularly to an asphalt emulsion spraying apparatus for spraying an asphalt emulsion to a step portion between an existing paved road and an unpaved road surface continuously paved. is there.

  After asphalt paving a road of one lane using lanes and formwork adjacent to the shoulder curb, then removing the formwork and asphalt paving the lane adjacent to this asphalt paving road, concrete paving road or asphalt paving Asphalt paving is done so that there is no gap between the existing paved road and curb and the newly paved part when cutting the degraded part of the road and paving again with asphalt. Prior to the work, it is necessary to spray the asphalt emulsion on the stepped portion between the existing paved road surface and curb and the unpaved road surface continuously paved.

In general, this asphalt emulsion spraying work is often carried out manually, but a spraying machine (Patent Document 1) equipped with a set of spraying apparatus on a manpowered vehicle, a spraying machine (Patent Document 2) mounted with a spraying apparatus on a truck, An asphalt finisher (Patent Document 3) equipped with a spraying device is also known.
Japanese Utility Model Publication No. 63-100506 Japanese Utility Model Publication No. 60-14104 Japanese Patent Laid-Open No. 11-256511

  The asphalt finisher (Patent Document 3) equipped with a spraying device sprays the asphalt emulsion from the spraying device to the road surface in front of the screed. Efficiency is improved. However, in the case of so-called joint pavement where the pavement is continued on the existing pavement surface without gaps, the distance between the stepped portion that becomes the seam and the end surface of the screed is not constant during the pavement operation, and thus varies from beginning to end. It is impossible to evenly distribute the asphalt emulsion to the corners, and there is a problem that the asphalt emulsion must be separately applied to the stepped portion by a dispersing device.

  Therefore, simultaneously with the asphalt pavement work, a technical problem to be solved in order to save labor by allowing the asphalt emulsion to be evenly distributed on the stepped portion between the existing paved road surface and the unpaved road surface arises. Aims to solve the above problems.

  The present invention proposes to achieve the above object, and asphalt with an asphalt emulsion spraying device for spraying an asphalt emulsion to a step portion between an existing curb or a paved road and an unpaved road surface continuously paved with the curb. The asphalt emulsion spraying device is a finisher provided with a telescopic arm and a telescopic arm drive mechanism that can slide in the width direction at the lower part of the vehicle body, and an ultrasonic or optical step position detecting means and an asphalt emulsion at the tip of the telescopic arm. A spray nozzle is attached, and the telescopic arm drive mechanism is controlled according to the detection value of the step position detecting means to expand and contract the telescopic arm, and when the step position detecting means is positioned vertically above the step portion, the required distance from the step portion. And an automatic control means that always directs the spray direction of the asphalt emulsion spray nozzle to the stepped portion. There is provided a bitumen emulsion sprayer in Middelfart finisher.

  Further, either or both of the step position detecting means and the asphalt emulsion spraying nozzle are attached to the telescopic arm via an elevating mechanism, and optionally both the step position detecting means and the asphalt emulsion spraying nozzle by a hydraulic cylinder or a motor. Alternatively, the present invention provides an asphalt emulsion spraying device in an asphalt finisher configured so that one of the heights can be adjusted.

  The asphalt emulsion spraying device in the asphalt finisher of the present invention is equipped with an ultrasonic or optical step position detecting means and an asphalt emulsion spraying nozzle attached to the telescopic arm, and controls the amount of expansion and contraction of the telescopic arm to control the emulsion of the asphalt emulsion spraying nozzle. Asphalt emulsion is sprayed to the stepped part of the existing paved road surface and the unpaved road surface at all times, so it is not necessary to manually spread the asphalt emulsion on the stepped part prior to asphalt paving work on the unpaved road surface. Work efficiency is improved and labor can be saved. In addition, there is almost no unevenness in the dispersion of the emulsion, and the pavement quality is uniform.

  In addition, since the existing paved road surface and the asphalt paved road surface in the stepped portion are bonded, the occurrence of chipping and peeling from the stepped portion can be reduced, and the useful life of the paved road surface can be improved.

  The present invention is an asphalt finisher with an asphalt emulsion spraying device for spraying an asphalt emulsion to a step portion between an existing curb or a paved road and an unpaved road surface continuously paved. A telescopic arm and a telescopic arm drive mechanism that can slide in the width direction are provided at the bottom, and an ultrasonic or optical step position detecting means and an asphalt emulsion spray nozzle are attached to the tip of the telescopic arm, and the detected value of the step position detecting means Accordingly, the telescopic arm drive mechanism is controlled to expand and contract the telescopic arm, and when the step position detecting means is positioned vertically above the step portion, the spray direction of the asphalt emulsion spray nozzle is always stepped from the step portion at a required interval. By providing automatic control means to the part, the existing paved road surface and unpaved as well as asphalt pavement work To achieve the objective of labor-saving as possible sprayed uniformly emulsified asphalt to the step portion of the surface.

  1 and 2 show an asphalt finisher 1 equipped with the asphalt emulsion spraying device of the present invention, and a hopper 5 for accommodating an asphalt mixed material is disposed on the front part of a vehicle body 4 having wheels 2 and 3 on the front and rear. The screed device 6 is connected to the rear part. A bar conveyor (not shown) extending from the inner bottom surface of the hopper 5 to the rear end of the vehicle body 4 is disposed at the lower part of the vehicle body 4, and asphalt mixed material in the hopper 5 is moved to the rear of the vehicle body 4 by the bar conveyor. It is transported and dropped onto the road surface, spread in the width direction by a screw spreader (not shown) disposed between the vehicle body 4 and the screed device 6, and flattened by the screed device 6.

  An engine room 7 is provided at the center of the vehicle body 4, and an engine, a hydraulic pump, a radiator and an oil cooler, and other engine accessories are installed in the engine room 7. A driver's seat 8 is provided on the right side of the rear upper surface of the vehicle body 4, and an operation system device such as a steering wheel 9, a throttle lever, and a brake, and an instrument panel 10 are disposed in front of the driver's seat 8.

The automatic control type asphalt emulsion spraying device 12 of the present invention is disposed at the lower part of the vehicle body 4 and attached to the rear left side (right side in FIG. 2) of the counterweight 11 attached to the front end of the frame of the vehicle body 4. ing. The asphalt emulsion spraying device 12 can be mounted on the right side of the counterweight 11, and the mounting position is selected according to the work content. In addition, when paving an unpaved road for one lane between the left and right existing paved roads, install asphalt emulsion spraying devices 12 on the left and right sides of the back of the counterweight 11, respectively. Simultaneously spray asphalt emulsion on the part.

  As shown in FIG. 3, the asphalt emulsion spraying device 12 includes a slide guide 13 fixed to the back of the counterweight 11 and an extendable arm 14 that engages with the slide guide 13, and a step near the outer end of the extendable arm 14. A distance sensor unit 15 is attached as position detecting means, and an asphalt emulsion spray nozzle 17 is held by a nozzle holder portion 16 provided on the extendable arm 14. The asphalt emulsion spray nozzle 17 is located on the unpaved road surface at a required interval from the step when the distance sensor unit 15 is positioned vertically above the step during the asphalt emulsion spray performed simultaneously with the asphalt paving operation. However, it is held in such a posture that the injection direction faces the stepped portion.

  A rack 18 is formed on the side surface of the telescopic arm 14, and the pinion gear 20 of the hydraulic motor 19 attached to the slide guide 13 meshes with the rack 18 of the telescopic arm 14, and if the hydraulic motor 19 is driven, its rotation Depending on the direction, the telescopic arm 14 slides in the outward direction (extension direction) or the inward direction (contraction direction).

  The distance sensor unit 15 has been conventionally provided in various configurations depending on the measurement purpose. Here, a plurality of ultrasonic sensors are used to detect the position of the stepped portion between the paved road surface and the unpaved road surface. The one arranged in parallel is used. The distance sensor unit 15 attached to the telescopic arm 14 is connected to the controller box 21 by a cable, and the controller box 21 can perform initial position reading setting and arbitrary telescopic adjustment.

  As shown in FIG. 4, the distance sensor unit 15 used here has five ultrasonic sensors 22 arranged in parallel, and the control unit 23 drives the five ultrasonic sensors 22 so that each ultrasonic sensor The ultrasonic wave is transmitted from the sensor 22 to the road surface vertically below, the reflected wave from the target road surface is received, and the distance is calculated from the phase difference between the transmitted wave and the received wave. The control unit 23 drives the hydraulic motor 19 so as to feedback-control the amount of expansion / contraction of the extendable arm 14 so that the central ultrasonic sensor among the five ultrasonic sensors 22 is positioned vertically above the stepped portion.

  Although not shown in FIG. 3, as shown in FIGS. 1 and 2 (b), the telescopic arm 14 of the asphalt emulsion spraying device 12 is extended backward, and the electric heater H is attached to the rear end thereof. For example, the drying of the sprayed asphalt emulsion can be accelerated by the electric heater H, and the asphalt emulsion can be sufficiently dried prior to the asphalt paving performed immediately after the spraying. Further, instead of the electric heater H, a torch burner may be provided to dry with hot air.

  When using the asphalt emulsion spraying device 17, move the asphalt finisher 1 onto the unpaved road surface, bring the side of the asphalt finisher 1 on which the asphalt emulsion spraying device 17 is mounted to the stepped portion, and then use the controller box 21. The telescopic arm 14 is expanded and contracted to position the central ultrasonic sensor vertically above the stepped portion. This position adjustment can be visually confirmed with an LED, a lamp or a monitor screen provided in the controller box 21. That is, since the ultrasonic sensor vs. unpaved road surface distance L + α is longer than the ultrasonic sensor vs. paved road surface distance L, when the central ultrasonic sensor is positioned vertically above the stepped portion, 2 on the vehicle body center side. The detection distance L + α in which the detection distances of the two outer ultrasonic sensors are longer than the detection distance L of the individual ultrasonic sensors is shown. In this position adjustment, when the detection distance of the central ultrasonic sensor shows an intermediate value between the distance L and the distance L + α, for example, the central LED of three LEDs arranged in parallel lights up. Thus, it can be confirmed that the central ultrasonic sensor is positioned vertically above the stepped portion.

  Thereafter, when the control unit 23 drives the hydraulic motor 19 to control the expansion / contraction amount of the expansion / contraction arm 14 and the detection distance of the central ultrasonic sensor increases (when the distance sensor unit 15 is displaced to the unpaved road surface side) ) When the telescopic arm 14 is extended and the detection distance of the central ultrasonic sensor decreases (when the distance sensor unit 15 is displaced toward the pavement surface), the telescopic arm 14 is contracted and the asphalt finisher 1 travels. Feedback control is performed so that the ultrasonic sensor at the center of the distance sensor unit 15 is always positioned above the step position (the boundary line between the paved road surface and the unpaved road surface).

  Since the asphalt emulsion spray nozzle 17 is held by the nozzle holder 16 of the extendable arm 14, it moves in the width direction of the road surface together with the distance sensor unit 15, and the asphalt emulsion is always sprayed on the wall surface and bottom corner of the stepped portion. Is done. The initial adjustment of the spraying direction of the asphalt emulsion spraying nozzle 17 can be performed by adjusting the mounting posture on the nozzle holder 16 or adjusting the angle of the flexible head portion of the spraying nozzle 17.

  In addition, since the asphalt finisher forward speed during pavement work is extremely low, the amount of asphalt emulsion sprayed per unit time is also relatively small. If continuous spraying is excessive due to the spray performance of the nozzle, the asphalt finisher By using a known method of intermittent spraying by controlling the on-off valve control provided in the emulsion spraying nozzle 17 or in the vicinity thereof, the spraying amount can be made smaller than the continuous spraying.

  The asphalt emulsion spraying device 31 shown in FIG. 5 uses a hydraulic cylinder 32 instead of the rack and pinion mechanism shown in FIG. The outer cylinder 33 of the hydraulic cylinder 32 is fixed to the rear end plate of the slide guide 35, and the piston rod 34 pushes and pulls the telescopic arm 36 to slide.

  At the tip of the telescopic arm 36, an elevating table 37 that holds the distance sensor unit 15 and the asphalt emulsion spraying nozzle 17 is slidably mounted up and down, and the elevating table 37 is driven up and down by a hydraulic cylinder 38, and the controller box The height of the distance sensor unit 15 and the asphalt emulsion spray nozzle 17 can be adjusted by operating 21. This makes it easy to adjust the initial settings of the distance sensor unit 15 and change the spray direction of the asphalt emulsion spray nozzle 17, and to adjust the spray direction of the asphalt emulsion without interrupting the work even during work. It is.

  The present invention is not limited to the above-described embodiment, and various modifications are possible within the technical scope of the present invention, and it is natural that the present invention extends to those modifications.

The side view of the asphalt finisher which showed embodiment of this invention and equipped with the asphalt emulsion spraying apparatus. (a) is a partially cutaway front view of the asphalt finisher of FIG. 1, and (b) is an AA arrow view of FIG. The perspective view of an asphalt emulsion spraying device attachment part. The block diagram of the position control system of an asphalt emulsion spraying apparatus. The perspective view of the asphalt emulsion dispersion | spreading device attachment part which shows other embodiment.

Explanation of symbols

1 Asphalt finisher
12 Asphalt emulsion spraying equipment
13 Slide guide
14 Telescopic arm
15 Distance sensor unit
16 Nozzle holder
17 Asphalt emulsion spray nozzle
18 racks
19 Hydraulic motor
20 pinion
21 Controller box
22 Ultrasonic sensor
23 Control unit
31 Asphalt emulsion spraying equipment
32 Hydraulic cylinder
35 Slide guide
36 Telescopic arm
37 Lift platform
38 Hydraulic cylinder
H Electric heater

Claims (2)

An asphalt finisher with an asphalt emulsion spraying device for spraying an asphalt emulsion to a step portion between an existing curb or a paved road and an unpaved road surface continuously paved,
The asphalt emulsion spraying device has a telescopic arm and a telescopic arm drive mechanism that can slide in the width direction at the bottom of the vehicle body, and an ultrasonic or optical step position detecting means and an asphalt emulsion spraying nozzle are attached to the tip of the telescopic arm.
Asphalt emulsion is controlled at a predetermined interval from the step when the extendable arm is extended and contracted by controlling the extendable arm drive mechanism according to the detection value of the step position detecting means, and the step position detecting means is positioned vertically above the stepped portion. An asphalt emulsion spraying apparatus in an asphalt finisher, comprising automatic control means for always directing the spraying direction of the spray nozzle toward the stepped portion. Either or both of the step position detecting means and the asphalt emulsion spray nozzle are attached to the telescopic arm via an elevating mechanism, and either or both of the step position detecting means and the asphalt emulsion spray nozzle are arbitrarily selected by a hydraulic cylinder or a motor. The asphalt emulsion spraying apparatus for an asphalt finisher according to claim 1, wherein the asphalt finisher is configured to be adjustable in height.

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