JP3957594B2 - Asphalt finisher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an asphalt finisher that performs asphalt pavement construction.
[0002]
[Prior art]
The asphalt pavement road is composed of a plurality of asphalt layers in which asphalt pavements are constructed in several layers. Asphalt pavement consists of a layer of a mixture of natural sand, gravel, crushed stone and other aggregates mixed with straight asphalt, and asphalt is a solidified mixture.
[0003]
Straight asphalt, the raw material for asphalt, is mainly extracted from heavy Middle Eastern crude oil by refining it. When crude oil is heated to about 350 ° C. in a heating furnace and sent to an atmospheric distillation column, a fraction having a long arrangement of carbon molecules and a highest boiling point is accumulated at the bottom of the distillation column. The fraction collected at the bottom is taken out and distilled again in a vacuum distillation column reduced in pressure to keep the boiling point low, and the fraction collected at the bottom of the vacuum distillation column is straight asphalt.
[0004]
Straight asphalt is sent to the asphalt mixture plant by a tank truck equipped with a heating device that can keep the temperature at about 160 ° C. in order to prevent solidification. In the asphalt mixture plant, the mixture is manufactured by changing the blending ratio of aggregates classified into four ranks according to the asphalt layer constituting the asphalt paved road. Here, the aggregate refers to natural sand, gravel, or crushed stone that is mixed with cement during the production of mortar, concrete, or the like, and the composite refers to a mixture of aggregate and straight asphalt.
[0005]
In the asphalt mixture plant, aggregates divided into 4 ranks according to particle size are extracted from crushed stone with particle size of about 20 mm to sand with particle size of 2.5 mm or less, and heated to 160 ° C. while stirring together. . In a heated state, it is sieved again, dropped in order from a large aggregate, weighed, and aggregate that matches the blending ratio of the asphalt layer to be constructed is put into a mixer together with stone powder that is limestone powder having a particle size of 75 μm or less.
[0006]
In the mixer, straight asphalt is sprayed on the aggregate and mixed thoroughly to form a composite material. In this composite material, straight asphalt serves as a binder that bonds the aggregates together, so the amount of straight asphalt sprayed is 5-6% by weight with the aggregate and 12-13% by volume. It is.
[0007]
On the other hand, at the construction site, construction of installing drainage grooves at the edge of the road, construction of leveling the roadbed with bulldozers, etc., lower roadbed construction of scrubbing rough crushed stone with a motor grader and compacting with tire rollers, etc. And wait for the asphalt pavement to be constructed. The traffic volume and the hardness of the roadbed are investigated in advance, the thickness of the asphalt paved road and the thickness and number of each asphalt layer are determined, and the construction conditions are determined.
[0008]
The asphalt finisher is in charge of the process of mixing and leveling the mix that is mixed at the asphalt mix plant and transported to the construction site by trucks and dump trucks. The mixed material is directly delivered from the truck or dump truck to the asphalt finisher, spread to the width of the asphalt pavement, and pressed against the lower roadbed and laid. The leveling process consists of asphalt finisher steering and speed, the operator adjusting the amount of mix supplied, the screed man responsible for ensuring flatness and uniform pavement thickness, and the mixture overflowing from the side cover It will be a joint work of personnel called Rakeman to handle. Here the operator and screedman are on board the asphalt finisher. The rakeman works on the ground.
[0009]
In the subsequent rolling process, the road roller compacts the composite material in the thickness direction of the pavement surface with a load of 10 tons, for example, and the tire roller compacts the surface of the pavement surface with a load of 15 tons, for example. Complete the asphalt layer that composes.
[0010]
The lower asphalt layer is constructed with a mixture using mainly coarse aggregate in the mixing ratio, and the upper asphalt layer is constructed with a mixture using finer aggregate to complete each asphalt layer. Let's finish the construction of the asphalt paved road that overlapped several layers. Construction of asphalt paved road is completed by constructing paint such as center line and division line on the road surface, and the road opens.
[0011]
Here, as an example of the layer structure of the asphalt paved road, from the surface to the deep part, the asphalt pavement is made with a mixture layered with a mixture of fine aggregates, a surface layer paved with a mixture of fine aggregates, and a slightly coarse aggregate. The intermediate layer, a base layer paved with asphalt with a mixture of coarse aggregates, an upper layer roadbed made of crushed stone stabilized with asphalt, and a lower layer roadbed made of crushed stone. Below the lower roadbed is a compacted substrate, called a roadbed or road.
[0012]
Asphalt is fluidized at high temperatures, so it is easy to mix with crushed stone, gravel, or sand, and there is no need to wait for the material to harden like concrete, as soon as the temperature drops after compaction Solidify. Asphalt paved roads take advantage of this characteristic, and the time to block traffic can be minimized by laying and repair work, and it is not as hard as concrete, so it can absorb the impact of a passing car, and the ride comfort is good The noise of passing cars is also low. Also, asphalt is difficult to pass water, so it can protect the roadbed under asphalt pavement.
[0013]
Regarding the construction of asphalt paved roads, the traffic volume is investigated in advance to determine the thickness and strength of the pavement, so it is designed not to break for 10 years unless the traffic volume greatly exceeds expectations. The cause of the collapse of the asphalt pavement is not due to heavy truck traffic, but the rainwater that has fallen on the asphalt pavement soaks into the roadbed through the roadbed, the roadbed itself is washed away, and the lower roadbed and the asphalt pavement surface. There is a gap between the two, and it will be unable to withstand the load of a passing car or the like and will collapse and collapse. Therefore, an actual asphalt paved road is designed so that the central portion of the road width is raised and rainwater that falls on the road surface flows on the surface layer and collects in drainage grooves installed at the edge of the road.
[0014]
If rainwater does not soak into the road, a water film will form between the tires of the passing car and the road surface, causing a brake failure (hydroplaning phenomenon), which may cause a traffic accident during rainy weather. Therefore, in recent years, drainage paved roads called high-standard roads have been adopted for highways and main roads. In addition to eliminating the hydroplaning phenomenon, the drainage paved road is said to have an effect of preventing the driver's view from deteriorating due to water splashing, and also to reduce noise.
[0015]
In the drainage paved road, the rainwater soaked in the surface layer flows on the base layer below and is collected in the drainage ditch. At this time, the surface layer infiltrated with rainwater is constructed with a mixture of sand and stone powder mixed with a bit rougher aggregate than normal pavement and mixed with asphalt with increased adhesion by adding rubber and resin. To do. As a result, a surface layer having innumerable voids through which rainwater passes is formed, so that rainwater that has fallen on the road surface passes through the surface layer in a short time, and therefore cannot accumulate on the road surface.
[0016]
In addition, a method of saturating the ground instead of draining rainwater is called permeable pavement, and is a pavement method for sidewalks.
[0017]
[Problems to be solved by the invention]
The composite material that forms the surface layer of drainage paved roads is mixed with asphalt that has a slightly rougher aggregate than ordinary pavement and sand and stone powder, and rubber and resin are added to increase the adhesion. Therefore, the temperature of the composite material is likely to drop compared to a normal one. When the temperature of the mixture decreases, solidification begins, making it difficult to work with the asphalt finisher.
[0018]
If the road is wider than the width of the asphalt finisher, such as a road with a width of 7m, it will be installed twice with a width of 3.5m. A portion where the end portion of the first construction and the end portion of the second construction overlap in the case of the second construction is referred to as a joint portion. The joint portion is heated by a propane burner loaded on a so-called cat car when the second construction is performed after the first construction. This heating requires more personnel than the rakeman. Since the temperature of the composite material carried to the side cover position of the asphalt finisher is lower in the heating of the part that becomes the joint part that has been constructed in the first time, the first construction part and the second construction in the joint part. This is done because the parts are well connected.
[0019]
However, because the propane burner flame is directly applied to the joint, asphalt with a melting point of 200 ° C is attached to the aggregate, so skill is required to apply the flame, and asphalt melts depending on the flame application. As a result, the aggregate is almost exposed at the portion that has flowed and is exposed to the flame, and there may be a poor connection between the first construction portion and the second construction portion in the joint portion.
[0020]
Moreover, the conventional side cover can adjust the inclination in the front-rear direction according to the road surface, but is fixed after the adjustment. Therefore, if there is a gap between the side cover and the construction surface, the composite material goes out of the construction width through this gap. The rakeman scoops and processes the mixed material that goes out of the construction width. The mixed material that goes out of the side cover is the road side, the joint portion, and both sides.
[0021]
In addition, as the composite material is conveyed toward the side cover with a screw installed in front of the screed, the temperature of the composite material at, for example, 150 ° C. to 155 ° C. decreases, and the composite material adheres to the side cover of the asphalt finisher. Solidify. During the construction of asphalt pavement, the solidified composite material repeatedly accumulates and falls between the side cover and the surface under construction, resulting in protrusions on the surface after construction and the flatness of the asphalt pavement surface worsening Therefore, the specified construction conditions cannot be satisfied.
[0022]
Therefore, in addition to the work that Rakeman has been in charge of in the past, it is physically responsible for removing the adhering and solidified composite material from the side cover or preventing the accumulation of the composite material. The number of workers to be increased is being installed. Thus, in the construction of drainage pavement, new personnel are required, resulting in an increase in construction cost. In addition, if drainage pavement is constructed by the personnel required for conventional asphalt pavement, the amount of work for the rakeman increases, so the overall leveling process, which is the joint work of the operator, screedman and rakeman, is the slowest overall. Therefore, the construction speed was slow compared to ordinary asphalt pavement, and there was a need for improvement.
[0023]
In order to reduce the work load of Rakeman, use a burner to radiate a flame and melt and drop the mixed material adhering to the side cover, or to apply light oil and other fats and oils to the side cover in violation of the construction conditions It is also heard that the adhesion of the composite material is prevented, but both are far from the fundamental solution because they surpass the spot.
[0024]
Even in normal asphalt pavement construction, the time required to process the mixed material overflowing outward from the side cover, which is in charge of the rakeman, determined the construction speed. This is because the operator and screedman are in charge of the machine operation, but the rakeman is in charge of human work. Even in normal asphalt pavement construction, in order to reduce the construction time, it was required to reduce the amount of mixed material overflowing from the side cover in order to reduce the work load of the rake man.
[0025]
In addition, asphalt pavement construction involves not only new road laying, but also many new constructions to reconstruct asphalt pavement on the road in service. Asphalt pavement re-installation and re-installation, etc., will be performed with traffic blocked, so it is required to reduce the time to block traffic as much as possible, so the asphalt pavement construction time itself can be shortened. It was sought after.
[0026]
An object of the present invention is to provide an asphalt finisher that can save labor and improve the quality of construction on the joint and roadside.
[0027]
SUMMARY OF THE INVENTION An object of the present invention is to provide an asphalt finisher that saves the work of a rake man and improves the construction efficiency by using a side cover that can prevent the material from being deposited and peeled around the side cover on the road side.
[0028]
In the asphalt pavement leveling process, the present invention reduces the work load of the rake man, shortens the time required for the work and increases the construction speed, and for the composite material constituting the surface layer of the drainage pavement. The purpose of the present invention is also to provide an asphalt finisher that can secure a construction speed equivalent to or higher than that of normal construction.
[0029]
[Means for Solving the Problems]
Prevents the mixed material from adhering to the side cover and falling off during asphalt pavement construction, or from adhering to the side cover and the work surface. As a means, the entire side cover in contact with the construction surface is heated to prevent the mixture from adhering to the side cover.
[0030]
By using a liquefied petroleum gas burner as a means for heating the side cover, the size of the burner can be reduced compared to a light oil burner, the temperature can be raised in a short time compared to an electric heater, and the side cover is hollow. By using the structure, uniform heating can be performed.
[0031]
At the time of asphalt pavement construction, most of the composite material overflowing from the side cover occupies the gap between the bottom surface of the side cover and the construction surface. As a means for reducing the amount of the mixture overflowing from the side cover, the side cover itself is provided with a mechanism that automatically adjusts its posture with respect to its own road surface regardless of the position and posture of the screed. As a result, the gap between the construction surface and the side cover bottom surface can be eliminated, and the mixture overflowing from the gap between the bottom surface of the side cover and the road surface can be eliminated.
[0032]
Accordingly, the work performed by the rake man is reduced, the work time is shortened, the construction speed by the asphalt finisher is increased, and the construction time of the spread leveling process is shortened. Also, the asphalt finisher is in charge of the leveling process, and the road roller and tire roller are in charge of the rolling process, but the leveling process requires more work time than the rolling process. Since the rolling process can be started earlier by shortening the time of the leveling process, which is the previous process, the construction time of the asphalt pavement work is shortened.
[0033]
The present invention is as follows if the same number as the number of a claim is attached | subjected and shown.
[0034]
According to a first aspect of the present application, there is provided an asphalt finisher that performs asphalt pavement, a traveling device that travels the asphalt finisher, a composite material conveying device that conveys the mixed material from a hopper at the front of the vehicle to the rear of the vehicle, Screw blades that spread the material to the width of the asphalt pavement, a central screed that presses against the surface on which the composite material is applied, a wide screed that is adjustable on both sides of the central screed and presses against the surface on which the composite material is applied, and wide A side cover that is attached to the nurse screed and forms the end of the asphalt pavement, a center screed, a wide nurse screed, and a support means that supports the side cover in a tiltable manner, and the entire bottom surface of the side cover is a surface on which the composite material is applied. Asphalt finisher progresses as the side cover comes into contact with And a posture adjusting device supported by the wide nurse screed so as to be tiltable in the front-rear direction with respect to the direction, the posture adjusting device of the side cover is pivotally attached to the frame of the wide nurse screed, and the other end via a spring. And a movable plate coupled to the substrate with a vertical pivot, and when the bottom of the movable plate hits the convex portion of the construction surface, the substrate is wide nurse. An asphalt finisher characterized in that it can be tilted against the spring force of a spring around a point pivotally attached to a Creed frame.
[0035]
A second invention according to the present application is an asphalt finisher that performs asphalt pavement, a traveling device that travels the asphalt finisher, a composite material conveyance device that conveys a composite material from a hopper at the front of the vehicle, and a composite material, Screw blades that extend the width of the asphalt pavement, a central screed that presses against the surface on which the composite material is applied, a wide nurse screed that is adjustable on both sides of the central screed and that presses against the surface on which the composite material is applied, and a wide nurse A side cover which is attached to the creed and forms the end of the asphalt pavement, a central screed, a widener screed, a support means for tiltably supporting the side cover, and a heating device for heating the side cover; Is a space provided along the bottom of the side cover, and combustion gas is introduced into the space. Burner, fuel supply means to the burner, and for sending combustion air to the burner and passing the combustion gas and the heated air heated by the burner through the space to uniformly transmit heat to the side cover through the space An asphalt finisher according to the first aspect of the present invention.
[0036]
According to a third aspect of the present application, the burner is disposed in a space provided in the front portion of the side cover following the space provided along the bottom portion of the side cover, and has a fan as an air supply means for combustion at the upper portion of the side cover. The second aspect of the invention is characterized in that outside air is sucked in by a fan, and air discharged from the fan is supplied to a space provided along the bottom portion of the side cover through a space provided in the front portion of the side cover. Asphalt finisher.
[0037]
According to a fourth aspect of the present application, there is provided an asphalt finisher that performs asphalt pavement, a traveling device that travels the asphalt finisher, a composite material conveying device that conveys the composite material from a hopper at the front of the vehicle, and a composite material, Screw blades that extend the width of the asphalt pavement, a central screed that presses against the surface on which the composite material is applied, a wide nurse screed that is adjustable on both sides of the central screed and that presses against the surface on which the composite material is applied, and a wide nurse The side cover that is attached to the creed and forms the end of the asphalt pavement, the center screed, the widener screed, the support means that supports the side cover in a tiltable manner, and the entire bottom surface of the side cover against the surface on which the composite material is applied Asphalt finisher running side cover so that it touches The posture adjustment device supported by the wide nurse screed so as to be tiltable in the front-rear direction, and a heating device that heats the side cover, the posture adjustment device for the side cover according to the first invention An asphalt finisher characterized in that the heating device is a heating device according to the second or third aspect of the invention.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0039]
In the following description, the left and right are the left and right as viewed in the direction of travel of the asphalt finisher. The front-rear direction refers to the same direction as the asphalt finisher travels.
[0040]
(overall structure)
1 and 2 are a side view and a plan view of an asphalt finisher. The chassis frame 1 is supported by four wheels 2 and travels in the direction of arrow A with an internal combustion engine (not shown). That is, the asphalt finisher as a vehicle has a traveling device. In addition, there exists a thing by a crawler as a traveling apparatus. A screed device 5 is provided at the end of the arm 4 whose root is coupled to the chassis frame 1 by a pin 13. The ends of the arms 4 on both sides are joined by a horizontal member, and a fixed shaft 7 is provided across the arms. A central screed frame 8 is rotatably supported on the fixed shaft 7. Both ends of a nut 9 are pivotally attached to the upper end of the central screed frame 8, and a screed angle adjusting screw 11 is screwed into the nut 9. The adjusting screw 11 is supported so as not to move in the axial direction by a bearing 14 that is swingably supported by a shaft 12 that extends between the arms 4. An operation handle 10 is fixed to the screed angle adjusting screw 11. A central screed 15 is fixed to a frame member extending to the left and right of the central screed frame 8. At the front end of the central screed 15 in the direction of travel, a central screed push plate 15a for pushing the supplied composite material and feeding the composite material between the lower surface of the central screed 15 and the roadbed is provided upright. A widener support frame 16 is fixed to the central screed frame 8. A widener frame 17 is attached to the widener support frame 16 so as to be extendable in both the left and right directions. The widener support frame 16 is provided with a circular hole as a guide in the horizontal direction, and the guide bar 18 of the guide member is fitted into the circular hole so as to freely slide in and out. 17 is fixed. A piston rod 19 a of a hydraulic cylinder 19 provided in the widener support frame 16 is fixed to the widener frame 17. The widener frame 17 is provided with a widener screed push plate 21a for feeding the composite material between the iron portion of the widener screed 21 and the roadbed while pushing the composite material in the same manner as the central screed 15. Is supported by the widener support frame 16 so as to freely enter and exit. The central screed 15 is in front of the widener screed 21 in the vehicle traveling direction, and both end portions always overlap. The lower surfaces of the widener screed 21 and the central screed 15 are on the same plane.
[0041]
As shown in FIG. 1, a vertical clevis hydraulic cylinder 22 pivotally attached to both ends of the chassis frame 1 and the arm 4 rotates the arm 4 about the pin 13 to move the screed device 5 up and down. The screed device 5 is provided with a vibration device for screeds 15 and 21 (not shown). Moreover, the heating means for heating the iron part of both the screeds 15 and 21 is provided.
[0042]
During operation, the vehicle is moved forward, the clevis-type hydraulic cylinder 22 is extended, the arm 4 is rotated around the pin 13 and the screed device 5 is lowered to a required paved surface, and a hopper provided at the front of the vehicle. When an asphalt milk mixture (hereinafter referred to as a mixture) is introduced into 24, it is sent to a screw blade 26 disposed at the rear of the vehicle by a conveyor 25 as a mixture conveying device that moves in the direction of the arrow B in the figure, and the vehicle traveling direction Screw blades 26 arranged at right angles to the right and left sides are sent to the left and right sides, spread on the roadbed, pushed by the center screed 15 and the widener screed 21 by the asphalt finisher, and are vibrated and heated by these lower surfaces. The
[0043]
In the following description, one surface constituting the central screed 15 that faces in parallel with the rear surface after construction is defined as the bottom surface of the central screed 15, and one surface that constitutes the central screed 15 that faces in parallel with the rear surface of the chassis frame 1 is defined as the front surface of the central screed 15. .
[0044]
When the operation handle 10 is rotated, the nut 9 moves, the central screet frame 8 swings about the fixed shaft 7 and the screeds 15 and 21 tilt. Thereby, the attack angle can be adjusted. Here, the center screed 15, the widener screed 21, and the side cover 40 are supported on the arm 4 so that they can tilt simultaneously with the fixed shaft 7, the center screed 8, the nut 9, the handle 10, the screed angle adjusting screw 11, the shaft 12, and the bearing 14 Support means.
[0045]
When the clevis-type hydraulic cylinder 22 connected to the arm 4 is moved back and forth, the arm 4 swings around the pin 13 with respect to the chassis frame 1, and the central screed frame 8 and the central screed supported by the arm 4. The widener support frame 16 attached to the frame 8 moves up and down. As a result, the central screed 15 and the wide screed 21 advance and retract toward the construction surface.
[0046]
(Widener)
It is the widener screed 21 that determines the width of the asphalt paver for asphalt pavers. The screed that spreads and mixes the composite material is composed of a central screed 15 that is the basis of the width to be constructed and a widener screed 21 that adjusts the width to be constructed.
[0047]
The widener screed 21 constitutes the left and right wings of the screed with respect to the traveling direction of the asphalt finisher indicated by the arrow A, and constitutes the screed together with the central screed 15. The wide nurse screed 21 is fixed to the wide nurse screed frame 17. A side cover 40 that forms an end portion of the pavement is provided on the side of the widener screed 21.
[0048]
The widener screed 21 always has an overlap when viewed in the front-rear direction of the vehicle body while maintaining a certain clearance from the central screed 15.
[0049]
An asphalt finisher according to an embodiment different from those shown in FIGS. 1 and 2 is shown in FIGS. 3 and 4 are views for showing a conventional example of a side cover. 3 and 4, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description of FIGS. 1 and 2 is used.
[0050]
The end portion of the guide bar 18 that fits in the widener support frame 16 shown in FIGS. 3 and 4 is fixed to the widener frame 17 (see FIG. 5). The widener screed 21 is fixed to a slide (not shown) that is movably fitted in a left-right direction to a rail (not shown) fixed to the widener support frame 16 in parallel with the guide bar 18. The widener screed 21 is slidable with respect to the widener support frame 16. In FIGS. 1 to 5, the side cover 40 is a conventional one.
[0051]
(Conventional technology of side cover)
FIG. 5 is an enlarged view showing the side cover 40 shown in FIG. 3 in detail. As shown in FIG. 5, the side cover 40 prevents the mixed material conveyed by the substrate 41 and the screw blades 26 supported by the widener screed frame 17 and the widener screed pressing plate 21a from overflowing from the end of the construction. The movable plate 42 includes a hinge 43 that supports the movable plate 42 so as to be swingable with respect to the substrate 41, and a hook member 44 that fixes the movable plate 42. Here, the hinge 43 is located at substantially the same position as the widener screed push plate 21a when viewed in the front-rear direction. The hinge 43 has a vertical pivot, and the movable plate 42 can be opened to the left and right outwards.
[0052]
The substrate 41 is fixed to the wide frame 17 to which the screed 21 is fixed at one end of the widener screed 21 in the longitudinal direction. The substrate 41 moves with the widener screed 21 in accordance with the width of the asphalt pavement, and swings with the widener screed 21 as the attack angle is changed.
[0053]
The flange member 44 is disposed so as to extend laterally outside the substrate 41 and the movable plate 42. By two pins 44b and 44c fitted into the vertical through hole in which the two vertical through holes provided in the flange member 44 and the two through holes provided in the bracket 41h of the substrate 41 overlap. The flange member 44 is fixed to the substrate 41. The flange member 44 is further provided with another through hole in the vertical direction, and is fitted into the vertical through hole in which the through hole and the through hole provided in the rib 42b on the movable plate 42 are overlapped. The pin 44 a causes the eaves member 44 to move the movable plate 42 relative to the substrate 41. One end of the flange member 44 and the substrate 41 are rotatably supported by a hinge 44d, and the pin 44c also serves as a hinge pin of the hinge 44d. Therefore, in a state where the pins 44a and 44b are not attached, the flange member 44 can be rotated outward about the hinge 44d.
[0054]
The substrate 41 and the movable plate 42 are fixed by a flange member 44 and pins 44 a, 44 b, 44 c and integrated as a side cover 40. The side cover 40 receives the composite material in the width direction in which the composite material fed from the screw blades 26 is applied during construction of asphalt pavement. The composite material received by the side cover 40 passes under the wide nurse screet pressing plate 21a by the progress of the asphalt finisher, and is pressed against the construction front by the wide nurse screed 21, so that a spreading and leveling process is performed. At this time, the end of the construction can be formed by the presence of the side cover 40.
[0055]
By pulling out the pins 44a and 44b, the movable plate 42 pivots outward with respect to the substrate 41 around the hinge 43 in a state where the flange member 44 pivots outward about the pin 44c. Is possible. Further, when the pin 44c is pulled out, the flange member 44 is separated from the substrate 41.
[0056]
Immediately after the asphalt pavement construction, it is necessary to remove the mixed material solidified inside the movable plate 42 and the edge of the screw blade 26 and the periphery thereof, or to clean the periphery, and to perform maintenance inspection of the asphalt finisher. The above-described configuration is required. According to the above-described configuration, the movable plate 42 is rotated outwards, thereby facilitating cleaning of the inside of the movable plate 42, the end portion of the screw blade 26, the widener screed push plate 21a, and the like.
[0057]
Since the substrate 41 tilts together with the widener support frame 16 as the attack angle is changed, the movable plate 42 integrated with the substrate 41 also performs the same movement. Since the side cover 40 also swings and tilts about the fixed shaft 7 as a swing center, when the attack angle increases, the clearance between the construction surface at the front of the asphalt finisher traveling direction indicated by arrow A and the bottom surface 40a of the side cover 40 is increased. The gap between the construction surface at the rear portion in the traveling direction and the bottom surface 40a of the side cover 40 becomes larger, and the difference in the gap increases as the attack angle increases. Here, the bottom surface 40 a of the side cover 40 includes a bottom surface 41 a of the substrate 41 and a bottom surface 42 a of the movable plate 42. With respect to the longitudinal direction of the asphalt finisher, the width of the substrate 41 is smaller than that of the movable plate 42a.
[0058]
At the time of asphalt pavement construction, the position is adjusted so that the bottom surface 40a of the side cover 40 is lightly in contact with the edge of the drainage groove (L-shaped side groove, U-shaped side groove, etc.) at the portion corresponding to the edge of the road. When the bottom surface 40a of the side cover 40 in the rear part of the asphalt finisher in the traveling direction is brought into contact with the edge of the drainage groove, a gap is formed between the bottom surface 41a of the side cover 40 in the front part in the traveling direction and the edge of the drainage groove. The material overflows from this gap.
[0059]
The mixed material overflowing from the gap between the bottom surface 41 of the side cover 40 and the edge of the drainage groove has a rake that is a tool for scraping the mixed material, and a rakeman waiting on the side of the asphalt finisher is the asphalt finisher. It is collected while moving together with it and returned to the inside of the side cover 40 or sprayed on the front of the construction.
[0060]
This rakeman's work is slow due to human power, and it is necessary to reduce the asphalt finisher's progressing speed below the construction capacity of the asphalt finisher itself. Therefore, an embodiment that can reduce the rakeman's labor and improve the asphalt finisher traveling speed will be described below.
[0061]
As a conventionally known one, there is one in which the vertical position of the substrate 41 with respect to the widener frame 17 is adjustable.
[0062]
(Side cover with posture adjustment device)
A configuration in which the side cover 40 is swung in accordance with the gap generated between the bottom surface 40a of the side cover 40 and the joint portion or the road side by the attack angle, and the generated gap can be closed almost completely will be described.
[0063]
6, 7 and 8 show a side cover 40 with a posture adjusting device. 6 is a side view, FIG. 7 is a side view with the outer cover removed from FIG. 6, and FIG. 8 is a perspective view. By automatically adjusting the posture of the side cover 40 according to the gap generated between the bottom surface 40a of the side cover 40 and the construction surface, the gap between the bottom surface of the side cover and the construction surface is eliminated. This is called a posture adjustment device. In other words, the present embodiment has a posture adjusting device that can automatically eliminate the gap between the joint portion or the road side. In this embodiment, the bottom surface 40a of the side cover 40 is only the bottom surface 42a of the movable plate 42, and the substrate 41 is not provided with a bottom surface in contact with the road surface.
[0064]
An attachment plate 27 for attaching the side cover 40 is fixed to the widener frame 17. A movable substrate 41 is attached to the attachment plate 27. On the substrate 41, a bracket 41g is erected outwardly in the horizontal direction by welding. A pin 44c is detachably fitted into the through hole in the vertical direction passing through the bracket 41g and the through hole of the flange member 44. Each of the brackets 28 and 41g is a parallel plate. The plates on the same side of the brackets 28 and 41g are in a straight line.
[0065]
A hinge 43 having a vertical axis is fixed to the vertical side of the substrate 41. The hinge 43 couples the substrate 41 and the movable plate 42 with a pin 43a so that the movable plate 42 can be rotated outward about the pin 43a. At the lower end of the substrate 41, a pin 41b serving as a swing fulcrum penetrates the substrate 41 so that the substrate 41 can be rotated around the pin 41b. Here, the pin 41 b is fixed to the mounting plate 27. There is a long hole 41 c penetrating through the top of the substrate 41. The long hole 41c is an arc shape centering on the pin 41b and is a long hole in the lateral direction. A pin 41 d is fixed to the upper right end of the substrate 41.
[0066]
Bolts 41e fixed to the mounting plate 27 pass through the long holes 41c, and the board 41 is fixed to the widener frame 17 by tightening the nuts 41f screwed into the bolts 41e, and is attached by loosening the nuts 41f. Release from fixing to the plate 27. Usually, it is the latter, and the substrate 41 is swingable. The nut 41f is provided with a loosening prevention that is almost locked at any position.
[0067]
A special bolt 29 in which a through hole at one end is rotatably fitted to a pin 41d fixed to the substrate 41 has nuts 52 and 53 screwed into the middle and the other end. The bolt 29 passes through a through hole of a bracket-shaped seat plate 27 a provided integrally with the mounting plate 27. A compression coil spring 47 is inserted between the seat plate 27 a and the nut 53 and is contracted by being inserted into the bolt 29. The nut 53 has a flange shape. The nut 52 is on the opposite side of the compression coil spring 47 with the seat plate 27a in between.
[0068]
In FIG. 6, when the nut 53 is tightened, the interval between the nut 53 and the seat plate 27a is narrowed, so that the compression coil spring 47 is compressed. Conversely, when the nut 53 is loosened, the compression coil spring 47 extends.
[0069]
The movable plate 42 is coupled to the bracket 28 integral with one of the hinges 43 so as to be movable up and down. The other of the hinges 43 is integral with the substrate 41. A nut 28 a is welded to the bracket 28. The feed screw 54 screwed into the nut 28 a is inserted through the hole of the bracket 28. The upper part of the feed screw 54 is supported by a bearing bracket 42c provided on the movable plate 42 so as to be rotatable and not moved in the axial direction. A handle 54 a is integrally provided at the upper end of the feed screw 54. A vertical hole provided through a bracket 42d provided on the movable plate 42, a duct wall 42e (see FIG. 7), a bracket 28 integral with one of the hinges 43, and an upper wall 55a of the outer cover 55 fixed to the movable plate 42. A guide bar 56 is fitted in the. The outer cover 55 is fixed to the movable plate 42 with screws 57.
[0070]
Now, when the handle 54a is rotated, the feed screw 54 moves up and down relative to the nut 28a and moves up and down the bracket 42c, so that the movable plate 42 moves up and down. As a result, the bottom surface 40a of the side cover 40 can be aligned with the construction surface.
[0071]
In a state where the movable plate 42 and the substrate 41 are in a substantially vertical plane, there is a laterally extending flange member 44 substantially parallel to the movable plate 42 and the substrate 41. Pins 44a and 44c are detachably inserted into holes penetrating the brackets 28 and 41g and the flange member 44 in the vertical direction at both ends of the flange member 44. Accordingly, a triangle is formed by a line connecting the pin 43a of the hinge 43, the pins 44a and 44c, and a line connecting the pins 44a and 44c in a plan view. Therefore, the movable plate 42 cannot rotate around the hinge 43.
[0072]
In the above state, when the pin 44a or 44c is pulled upward, the flange member 44 can be rotated outward. Therefore, when the pin 44a or 44c is wetted, the movable plate 42 can be rotated outward about the hinge 43. In this state, the back surface of the movable plate 42 in the drawing, the screw blades 26, and the widener screed pressing plate 21a can be cleaned.
[0073]
The operation of the posture adjustment apparatus having the above configuration will be described. When the movable plate 42 is away from the construction surface, the nut 52 is in contact with the bracket 27a and the side cover bottom surface 40a is forwardly lowered with respect to the arrow a in the traveling direction of the asphalt finisher. Here, when the handle 42a is rotated to lower the movable plate 42, the bottom surface 40a first comes into contact with the construction surface on the front side in the vehicle traveling direction indicated by the arrow a. When the movable plate 42 is further lowered, the movable plate 42 and the bracket 28 of the hinge 43 and the like are lowered on the opposite side of the vehicle traveling direction of the arrow A. At this time, the substrate 41 connected by the hinge 43 rotates clockwise around the pin 41b, and the elongated hole 41c moves to the right. Further, the pin 41d and the bolt 29 move rightward and the compression coil spring 47 is contracted. Then, the nut 52 is separated from the bracket 27a of the mounting plate 27. Thus, the bottom surface 40 a of the side cover 40 is pressed against the construction surface by the spring force of the compression coil spring 47. Therefore, the bottom surface 40a of the side cover 40 is in close contact with the construction surface.
[0074]
When the asphalt finisher is advanced in the direction of the arrow A in the above state, when the front portion of the bottom surface 40a of the side cover 40 is moved up to the convex portion of the construction surface at the end of the construction surface, the entire side cover 40 has the pin 41b. 6, the pin 41 d fixed to the substrate 41 causes the bolt 29 to move to the right, and the nut 53 screwed into the bolt 29 moves to the right to contract the compression coil spring 47. Thereby, it moves so that the clearance gap between a construction surface and the bottom face of the side cover 40 may be eliminated.
[0075]
Conversely, when the construction surface is lowered so that the front portion of the bottom surface 40a of the side cover 40 is lowered at the construction surface end, the compression coil spring 47 pushes the substrate 41 through the nut 53, the bolt 29, and the pin 41d. Therefore, the substrate 41 is rotated counterclockwise around the pin 41b, and the entire side cover 40 is also rotated in the same direction, so that the bottom surface 40a is lowered forward so as to contact the construction surface. Thereby, it moves so that the clearance gap between a construction surface and the bottom face 40a of the side cover 40 may be eliminated.
[0076]
As described above, since the posture adjusting device acts so as to always eliminate the gap between the bottom surface 40a of the side cover 40 and the construction surface, the composite material may overflow outside through the bottom surface 40a of the side cover 40 and the construction surface. Disappear. In particular, the bottom surface 40a of the side cover 40 immediately follows the change of the construction surface because it corresponds to the inclination of the side cover 40 due to the expansion and contraction of the spring like the compression coil spring 47.
[0077]
As a result, the amount of the composite material that goes out of the construction surface beyond the side cover becomes extremely small, and the number of Rakeman processes can be significantly reduced. According to the example, the man-hour for the rakeman was 1/3 or less of the conventional one.
[0078]
The posture adjustment device for the side cover 40 can also eliminate the gap between the bottom surface 40a and the construction surface in response to a change in the attack angle.
[0079]
The attitude adjustment device can reduce the amount of mixed material that overflows from the bottom of the side cover 40 to a level that greatly reduces the work load on the rakeman, resulting in an increase in the speed of the leveling process in asphalt pavement. As a result, the construction period of asphalt pavement can be shortened.
[0080]
When asphalt pavement is constructed by lightly contacting the entire bottom surface 40a of the side cover 40 with the edge of the drainage groove on the edge of the road, the asphalt finisher vibrates up and down due to the unevenness on the front surface of the construction, and the bottom surface 40a of the side cover 40 is It may collide with the edge of the drain that is lightly touching. In particular, when the bottom surface 40a of the side cover 40 collides with the edge of the drainage groove at the front portion in the traveling direction, the edge of the drainage groove is damaged.
[0081]
When the bottom surface 40a of the side cover 40 is entirely in contact with the road surface, the bottom surface 40a of the side cover 40 at the front portion in the traveling direction of the asphalt finisher collides with a road-side convex portion. Therefore, when the side cover 40 is fixed to the widener frame 17, both the road side and the side cover may be damaged. In the side cover 40 of the embodiment, the shock due to the collision is buffered by installing the compression coil spring 47. Further, when the arcuate chamfered portion 40b is provided on the bottom surface 42a of the movable plate 42 as viewed in the traveling direction of the asphalt finisher, the side cover 40 is prevented from abruptly hitting the edge of the drainage groove. Here, the chamfered portion 40b is a position that becomes the corner of the bottom surface of the side cover 40 on the front side in the traveling direction when the asphalt finisher travels in the direction of arrow A. Therefore, there is no possibility that the edge of the drainage groove on the road side and the side cover are damaged by the combined action of the compression coil spring 47 and the chamfered portion 40b.
[0082]
Naturally, the side cover 40 that becomes the joint portion side swings around the pin 41b by the spring force of the spring 47 so that the bottom surface 40a is in close contact with the construction surface of the joint portion by loosening the bolt 46. . Therefore, there is no mixture overflowing from the side cover 40.
[0083]
(Side cover heating device)
In the construction of the surface layer of a drainage paved road, the temperature of the composite material constituting the surface layer is likely to drop, so the composite material that has lost its fluidity due to the drop in temperature adheres to the side cover 40 one after another and solidifies. Tend to.
[0084]
In addition, since the mixed material with reduced temperature is constructed near the side cover at the junction and on the road side, the performance of the constructed pavement is not sufficient on the road side. Is going. Also, in the joint part, the joint part is pre-heated with a burner in advance, and then the joint part is constructed. However, in the joint part, asphalt is removed from the aggregate by the flame, so the joining of the mixture may not be sufficient. obtain.
[0085]
An embodiment capable of solving the above-described problems and preventing the work efficiency from being lowered will be described below.
[0086]
FIG. 7 shows a state where the outer cover 55 is removed in FIG. To remove the outer cover 55, the fan cover 58 is removed, and the left guide bar 56 in FIG. 6 is pulled out. Further, the right guide bar 56 is pulled out as it is. As a result, the guide bar 56 escapes from the hole in the upper wall portion 55a of the outer cover 55. When the screw 57 is removed, the outer cover 55 can be separated toward the front side of FIG. Here, the fan cover 58 seals the fan 39 and the peripheral wall on the blowing side of the fan 39.
[0087]
In this embodiment, the side cover 40 includes all of the combustion devices. That is, the side cover includes a burner and combustion air supply means for feeding combustion air to the burner.
[0088]
In FIG. 7, the side cover 40 on the left side in the advancing direction of the asphalt finisher indicated by the arrow “a” is enlarged to illustrate the combustion chamber of the movable plate 42. A fan 39 is provided in a fan casing 39d having an air supply port 39b and an air outlet 39c. These fans 39 and the like are a main part of an air supply device as combustion air supply means. A space 49 is formed from the front surface of the side cover 40 along the bottom surface 40a. The entire space 49 is L-shaped, but the upper part extends to the opposite side to the arrow A and reaches the fan 39. This space 49 has a duct and has a square cross section.
[0089]
In order to supply electricity to the axial fan 39, an electric wire (not shown) is connected to a storage battery mounted on the vehicle body.
[0090]
The movable plate 42 having a substantially rectangular flat plate portion 42A is a bottom plate 42a (becomes the bottom surface 40a of the side cover 40) on the lower edge, and the front plate 42b is formed on the front edge. A front top plate 42f refracted above the front plate 42b is erected from the flat plate portion 42A of the movable plate 42 parallel to the paper surface of FIG. 7 toward the front side of the drawing. The movable plate 42 is provided with a duct wall 42g parallel to the front plate 42b. The upper end of the duct wall 42g continues to the lateral duct wall 42e. The duct wall 42e is provided with a hole into which the guide bar 56 is fitted. An ignition port 42i is provided in the duct wall 42g. The position of the ignition port 42 i is near the gas flow of the gas ejected by the burner 51. A door 59 that can open and close the ignition port 42i is provided. The door 59 is a door that is open to the outside and is attached to the duct wall 42g with a hinge having a vertical pivot in the vicinity of the plate surface of the movable plate 42.
[0091]
The outer cover 55 has an upper wall 55a. The outer cover 55 has a substantially L-shaped flat plate and an upper wall 55a parallel to the bottom plate 40a.
[0092]
Of the space 49, the combustion chamber is mainly constituted by the bottom duct 49-3 along the bottom surface 40a. And the gas burner 51 is provided in the intermediate | middle duct 49-2 which is the space of the up-down direction of the front side of the side cover 40. As shown in FIG. The gas burner 51 is disposed downward and fixed to the side cover 40 so as to eject a flame downward. A fuel pipe 51a is routed upward from the burner 51, exits the side cover 40 near the fan 39, and a fuel valve 33 is coupled to the end. An LPG pipe (not shown) is connected to the inlet of the fuel valve 33 and an LPG tank (not shown) loaded on the vehicle body.
[0093]
The outer cover 55 is applied to the inside of the bottom plate 42a and the front plate 42b, and the hole of the outer cover 55 is inserted into the end surface of the duct wall 42g to fix the screw 57 to the female screw 42h. At this time, the end surface of the upper wall 55a contacts the flat plate portion 42A of the movable plate 42. The female screw 42h is provided on the top surface of a flat movable plate 42 with a boss having the same height as the duct wall 42g. Accordingly, when the outer cover 55 is attached to the movable plate 42, the flat plate portion 42A of the movable plate 42, the outer periphery of the side cover 40 including the bottom plate 42a, the front plate 42b, and the front top plate 42f, the duct walls 42e and 42g, and the upper wall 55a. A duct is formed by the inner circumference composed of the outer plate and the outer plate of the outer cover 55 parallel to the flat plate portion 42A of the movable plate 42. As a result, the space 49 includes an upper duct 49-1, an intermediate duct 49-2, and a bottom duct 49-3.
[0094]
The operation of the heating device will be described. The fan 39 is energized. A fan 39, which is an air supply device, sucks outside air from the suction port 39b and supplies air to the duct 49-1 from the air outlet 39c. As a result, the air flows through the ducts 49-1, 49-2, 49-3 and is discharged from the exhaust port 49b. The cover 59 that closes the ignition port 42i is opened. Next, when the fuel valve 33 is slightly opened, LPG gas is ejected from the burner 51. Immediately, the LPG gas in the air supply state is ignited by ignition means, for example, an igniter that generates electric sparks, through the ignition port 42i. After confirming ignition from the ignition port 42i, the cover 59 is closed. Next, the fuel valve 33 is fully opened. The fuel gas generated in the burner 51 passes through the duct on the downstream side of the burner 51 with respect to the gas flow, and heats the side cover 40. In particular, the heating strongly hits the chamfered portion 40b, and then heats the bottom plate 42a of the movable plate 42. Simultaneously with this heating, the combustion gas is heated around the duct downstream of the burner 51, reaches the exhaust port 49b, and is discharged to the outside. The side cover 40 including the movable plate 42, the outer cover 55 and the like is heated by transferring heat from the portion around the duct which is the space 49.
[0095]
Since the fan 39 is supplying air, the duct peripheral wall downstream from the burner 51 is heated almost uniformly. Further, since the bottom plate 42a and the front plate 42b are integral with the flat plate portion 42A of the movable plate 42, heat transfer from around the duct is effective for the flat plate portion 42A. Therefore, even if the temperature of the mixture sent from the left and right centers of the vehicle of the asphalt finisher by the screw blades 26 gradually decreases, the mixture hits the flat plate portion 42A of the movable plate 42 being heated. Therefore, the composite material is heated again. Therefore, the composite material does not adhere to and accumulate on the side cover 40.
[0096]
Conventionally, the low-temperature compound material tends to lower the sweeping temperature by the side cover becoming a heat radiating member. When the compound material adheres and accumulates on the side cover 40, the pin 44 a is removed each time, and the movable plate centering on the hinge 43. 42 was opened to remove the adhering material adhering to the side cover 40.
[0097]
In the embodiment of the present invention, since the chamfered portion 40b and the bottom surface 40a are heated, the construction surface is sufficiently heated in the construction on the joint portion and the road side, and is vibrated and pressed.
[0098]
Therefore, the manual heating by the LPG gas flame of the road side and joint part which was performed conventionally becomes unnecessary. Further, since the LPG gas flame is applied to the roadside and the joint portion, the asphalt is not blown from the aggregate by the flame and the quality of the pavement is not deteriorated.
[0099]
As described above, according to the embodiment of the present invention, there is an effect of increasing the temperature of the composite material, and the quality of the pavement of the road side and the joint portion is significantly improved as compared with the related art.
[0100]
By having both the side cover posture adjustment device and the heating device, it is possible to improve the quality of construction and save labor significantly.
[0101]
When the operation of the heating device is stopped, the fuel valve 33 is closed. Next, the control device of the fan 39 is turned off. When the control device is turned off, the normally open contact where the relay coil is energized to the motor of the fan 39 is opened, and the normally closed contact which has been opened so far is closed, and the timer operates to connect the fan 39 to the motor. Supply power.
[0102]
As a result, the entire side cover 40 is cooled by cooling around the ducts 49-1, 49-2, 49-3 by the outside air sent through the ducts 49-1, 49-2, 49-3. In a state where the fan 39 is stopped due to the time-up of the timer, the temperature is lowered to a temperature at which the hand can touch the side cover 40. In addition, if there is no timer, the side cover 40 is heated to break the insulation of the motor of the fan 39. If the fan is made of synthetic resin, it may be deformed. Can do.
[0103]
(Other embodiment of a heating apparatus)
Next, other embodiments of the side cover provided with the heating device are shown in FIGS. This embodiment includes a movable plate vertical position adjustment device and a posture adjustment device similar to the previous embodiment, but the vertical position adjustment device is omitted here. In addition, the description of the previous embodiment is used for the description of the posture adjustment device.
[0104]
The combustion air supply means of this embodiment feeds air from a fan provided away from the side cover to the combustion chamber through an air passage, a hose, etc. as described below.
[0105]
The space 49 of this embodiment is substantially the same as the duct 49-1 in the previous embodiment. This space 49 becomes an LPG combustion chamber. The space 49 has a long and narrow rectangular space along the bottom surface 40a. One end of the space 49 extends upward. The iron plate 48b that defines one upper end of the space 49 has an air supply port 49a, and the other end has an exhaust port 49b. There is an LPG supply port 49c in the vicinity of the air supply port 49a. The space 49 is separated from the atmosphere except for these three openings.
[0106]
The fuel gas combustion air supply means in the space 49 will be described. The air supply port 49a is joined to the metal pipe 35c via a hose joint 35b fixed to one end of the hose 35, and the other end of the hose 35 is joined to one end of the guide bar 18 (see FIG. 12) via the flange 36. The metal tube 35c passes through the air supply port 49a. The guide bar 18 has a hollow cylindrical shape.
[0107]
As shown in FIG. 12, the end of the guide bar 18 communicates with the blower outlet 37 b of the fan 37 via the widener support frame 16. Air in the atmosphere sucked from the suction port 37a of the fan 37 is blown into the widener support frame 16 from the blower outlet 37b. This air passes through the inner side of the hollow guide bar 18 via the widener support frame 16, passes through the hose 35 via the hose joint 35a, and flows into the space 49 from the metal pipe 35c. Here, the flange 36 connects the side plate of the widener frame 17 and the guide bar 18 and connects one end of the hose 35 to the guide bar 18. A guide bar 18 is movably fitted to the slide bearing 16a fixed to the widener support frame 16. Next, fuel supply means for supplying fuel gas to the space 49 will be described.
[0108]
As shown in FIG. 9, one end of an LPG pipe 38 of a flexible metal pipe is connected to a combustor such as a gas burner 51 (see FIG. 11) inside the space 49 through an LPG supply port 49c, and the other end is a chassis. It is connected to a pressure regulating valve (not shown) of a pressure vessel filled with LPG mounted on the frame 1. LPG is supplied from the pressure vessel to the burner 51 through the LPG pipe 38. As shown in FIG. 9, the fuel valve 33 is interposed in the LPG pipe 38.
[0109]
Close the gas burner 51, open a lid 48 c that communicates with the space 49 and the outside, close sparks, flames, etc. from the hole to the burner 51 to ignite the burner 51, operate the fan 37, and let air flow into the space 49, Combustion continues in the space 49 by exhausting the combustion gas that burns the LPG gas from the exhaust port 49 b to the atmosphere. By this combustion, the peripheral wall of the space 49 is heated, and the side cover 40 partitioning the space 49 is heated uniformly. In the above, an ignition device (for example, an electric spark plug) may be provided instead of the lid 48c. The supply amount of LPG is adjusted by the fuel valve 33 interposed in the LPG pipe 38. The fuel valve 33 also functions as a stop valve. By adjusting the opening degree of the fuel valve 33, the amount of fuel fed to the space 49 is adjusted, and the amount of heat generated in the space 49 is adjusted. Thus, the temperature of the side cover 40 is adjusted so that the composite material maintains the optimum construction temperature.
[0110]
The side cover 40 having such a configuration not only prevents the temperature of the mixed material that comes into contact with it, but conversely has the effect of raising the temperature by applying thermal energy to the mixed material. Therefore, the mixed material that has come into contact with the side cover 40 does not lose its fluidity due to a drop in temperature, so that the mixed material does not adhere and solidify. Moreover, since the temperature of the composite material to be constructed does not decrease, the pavement performance is maintained even at the joint portion and the road side, and post-work can be eliminated.
[0111]
In addition, since there is no mixed material adhering to the side cover 40 and solidifying, the work load of the rake man is greatly reduced, the construction speed of the leveling process in the asphalt pavement can be increased, and the construction period of the asphalt pavement can be shortened. It becomes possible. LPG gas is optimal as the fuel combusted in the space 49, but any gas or liquid can be selected as the fuel.
[0112]
【The invention's effect】
By attaching a heating device to the side cover, the mixed material that comes into contact with the side cover is not deprived of its own heat by the side cover that easily dissipates, so the mixed material solidifies and adheres to the side cover. It will not drop out. Therefore, there is no unevenness on the road side of the construction surface, and the flatness of the asphalt pavement surface is not deteriorated.
[0113]
The heating device can supply a large amount of heat with a simple device by using combustion gas. Since the gas is easy to adjust the temperature, a space is provided directly along the bottom of the side cover, and the side cover is directly heated by the combustion gas.
[0114]
By providing a posture adjusting device that adjusts the posture of the side cover itself, it is possible to prevent the mixture from overflowing from the bottom side of the side cover to the outside, thereby greatly reducing the labor of the rake man and improving the construction speed.
[0115]
Since the posture adjusting device presses the movable plate against the construction surface with a spring force, even if the side cover rides on the convex portion of the construction surface, an excessive force is not applied to the side cover. In addition, the bottom surface of the movable plate follows the unevenness of the construction surface well.
[0116]
By providing the heating device and the posture adjustment device, the composite material does not adhere to the side cover, and the amount of overflow of the composite material from the side cover is reduced, so the work load performed by the rake man is reduced and the work time is shortened, Asphalt finisher speeds up and the leveling process time is reduced, so the asphalt pavement time is reduced.
[0117]
By providing the combustion air supply means in the side cover, it is only necessary to replace the side cover as a unit, so that it can be easily adapted to a conventional asphalt finisher.
[Brief description of the drawings]
FIG. 1 is a side view of an asphalt finisher.
2 is a plan view of FIG. 1. FIG.
FIG. 3 is a perspective view of another embodiment of an asphalt finisher.
4 is a perspective view of the asphalt finisher of FIG. 3 as seen from different directions. FIG.
FIG. 5 is a perspective view of a conventional side cover.
FIG. 6 is a side view of the side cover according to the embodiment of the present invention.
FIG. 7 is a side view with a part of the side cover removed.
FIG. 8 is a perspective view of a side cover.
FIG. 9 is a perspective view of another embodiment of a side cover.
10 is a side view of FIG. 9. FIG.
FIG. 11 is a side sectional view showing a heating device for a side cover according to another embodiment.
FIG. 12 is a longitudinal sectional view of combustion air supply means for supplying air to the side cover.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Chassis frame 1a ... Body frame 1b ... Hydraulic source
2 ... Wheel 2a ... Front wheel 2b ... Rear wheel 2c ... Bearing
3 ... Hopper
4 ... arm
5 ... Screed device
6 ... Cover
DESCRIPTION OF SYMBOLS 7 ... Fixed shaft 7a ... Hydraulic motor (wheel) 7b ... Hydraulic motor (conveyor) 7c ... Hydraulic motor (crawler) 7d ... Hydraulic motor (screw)
8 ... Center screed frame 8a ... Hydraulic cylinder (shutter)
8b ... Hydraulic cylinder (arm) 8c ... Hydraulic cylinder (Widener)
8d ... 8c rod 8e ... Hydraulic cylinder (extension base)
8f ... Hydraulic cylinder (spread division)
9 ... Nut 9a ... Control panel (driver's seat) 9b ... Control panel (screed)
9c: Operation panel (right widener), 9d: Operation panel (left widener)
10 ... Control handle
11 ... Screed angle adjusting screw
12 ... axis
13 ... pin 13a ... drive wheel
14 ... Bearing 14a ... Pin
15 ... Center screed 15a ... Center screed push plate
16 ... Widener support frame 16a ... Slide bearing
17 ... Widener frame
18 ... Guide bar
19 ... Hydraulic cylinder 19a ... Piston rod
20 ... Screed device
21 ... Widener screed 21a ... Widener screed push plate
22 ... Clevis type hydraulic cylinder 22a ... Center screed 22b ... Expandable screed
23 ... Screed frame
24 ... Hopper
25 ... Conveyor
26 ... Screw blade 26a ... Central push plate 26b ... Retractable push plate
27. Mounting plate
28 ... Bracket 28a ... Nut
29 ... Special bolt 29a ... Spring seat
30 ... Widener
31 ... telescopic frame 31c ... side plate
32 ... telescopic table
33 ... Fuel valve
34 ... Electric wire
35 ... Hose 35a, 35b ... Hose joint 35c ... Metal pipe
36 ... Flange
37 ... Fan 37a ... Suction port 37b ... Air outlet
38 ... LPG piping
39 ... Fan 39a ... Casing 39b ... Suction port 39c ... Discharge port 39 ... Fan casing
40 ... Side cover 40a ... Bottom 40b ... Chamfer
41 ... Substrate 41a ... Bottom 41b ... Pin 41c ... Slot 41d ... Pin
41e ... bolt 41f ... nut 41g ... bracket 41h ... bracket
42 ... movable plate 42A ... flat plate portion 42a ... bottom plate 42b ... front plate 42c ... bearing bracket 42d ... bracket 42e ... duct wall 42f ... front top plate 42g ... duct wall 42h ... female screw 42i ... ignition port
43 ... Hinge 43a ... Pin
44 ... collar member 44a, 44b, 44c ... pin 44d ... hinge
47 ... Compression coil spring
48a ... Iron plate 48b ... Iron plate 48c ... Lid
49 ... Space 49a ... Air supply port 49b ... Exhaust port 49c ... LPG supply port 49-1, 49-2, 49-3 ... Duct
50 ... Bolt seat
51 ... Gas burner 51a ... Fuel pipe
52 ... Nut
53 ... Nut
54 ... Feed screw 54a ... Handle
55 ... outer cover 54a ... upper wall
56 ... Guide bar
57 ... Screw
58 ... Fan cover
59 ... Cover

Claims (4)

In the asphalt finisher that performs asphalt pavement construction,
A traveling device for traveling an asphalt finisher;
A composite material transporting device for transporting the composite material from the hopper at the front of the vehicle to the rear of the vehicle;
Screw blades that spread the composite material to the width of asphalt pavement,
A central screed that presses against the construction surface,
Widener screed that can be adjusted in position on both sides of the central screed and pressed against the surface on which the composite is to be constructed,
A side cover attached to the widener screed to form the end of the asphalt pavement;
Support means for tiltably supporting the center screed, the widener screed, and the side cover;
A posture adjusting device that is supported by a wide nurse screed so that the side cover can tilt in the front-rear direction with respect to the traveling direction of the asphalt finisher so that the entire bottom surface of the side cover is in contact with the surface on which the composite material is applied, The side cover posture adjustment device has one end pivotally attached to the widener screed frame and the other end connected to the widener screed frame via a spring,
A movable plate coupled to the substrate with a vertical pivot,
When the bottom of the movable plate hits the convex part of the construction surface, the substrate can be tilted against the spring force of the spring around the point where the substrate is pivotally attached to the frame of the wide nurse screed. Asphalt finisher. In the asphalt finisher that performs asphalt pavement construction,
A traveling device for traveling an asphalt finisher;
A composite material transporting device for transporting the composite material from the hopper at the front of the vehicle to the rear of the vehicle;
Screw blades that spread the composite material to the width of asphalt pavement,
A central screed that presses against the construction surface,
Widener screed that can be adjusted in position on both sides of the central screed and pressed against the surface on which the composite is to be constructed,
A side cover attached to the widener screed to form the end of the asphalt pavement;
Support means for tiltably supporting the center screed, the widener screed, and the side cover;
A heating device for heating the side cover,
The heating device is a space provided along the bottom of the side cover, a burner for sending combustion gas to the space, a fuel supply means for the burner, sending combustion air to the burner and being heated by the combustion gas and the burner. The asphalt finisher according to claim 1, further comprising combustion air supply means for causing the heated air to pass through the space and uniformly transferring heat to the side cover through the space. The burner is disposed in a space provided in the front portion of the side cover that follows the space provided along the bottom portion of the side cover, and has a fan as a combustion air supply means on the upper portion of the side cover. The asphalt finisher according to claim 2, wherein the discharged air is supplied to a space provided along a bottom portion of the side cover through a space provided in a front portion of the side cover. In the asphalt finisher that performs asphalt pavement construction,
A traveling device for traveling an asphalt finisher;
A composite material transporting device for transporting the composite material from the hopper at the front of the vehicle to the rear of the vehicle;
Screw blades that spread the composite material to the width of asphalt pavement,
A central screed that presses against the construction surface,
Widener screed that can be adjusted in position on both sides of the central screed and pressed against the surface on which the composite is to be constructed,
A side cover attached to the widener screed to form the end of the asphalt pavement;
Support means for tiltably supporting the center screed, the widener screed, and the side cover;
An attitude adjustment device that is supported by a wide nurse screed so that the side cover can tilt in the front-rear direction with respect to the traveling direction of the asphalt finisher so that the entire bottom surface of the side cover is in contact with the surface on which the composite material is applied, and the side cover A heating device for heating, wherein the posture adjusting device for the side cover is the posture adjusting device according to claim 1, and the heating device is the heating device according to claim 2 or 3. Asphalt finisher.

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