JPH11209918A - Hopper heat reserving device of asphalt finisher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain heat radiation of mixture, and enhance efficiency of paving work by forming a hopper of an asphalt finisher as a double plate structure, arranging a partition between it, filling a heat resistant heat insulating material or arranging a heating means. SOLUTION: A heat resistant type heat insulating material 11 unmelted/ undeformed by heat is filled in respective chambers by reinforcing it by arranging a partition 12 between them by forming an outside plate 7 of a hopper of an asphalt finisher out of inside/outside double plates 9, 10. When using an undefined heat insulating material 11, it is packed/filled in a heat resistant bag body, and in the case of a woven fabric material, it is superposed by plural layers or thick woven fabric is used. In the case of an inorganic foaming material, a material having a high closed cell rate is desirable. A heat reserving effect may be strengthened by inserting an exhaust gas of an engine and a heating medium of a heating system of a screed, etc., by arranging a passage of the heating medium between the inside/outside double plates 9, 10 or by laying an electric heater. Thus, the working efficiency can be improved by restraining heat radiation of mixture in the hopper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a hopper heat retaining device of an asphalt finisher for paving a heated asphalt mixture (hereinafter simply referred to as "mixture").

[0002]

2. Description of the Related Art Generally, an asphalt finisher is manufactured in a mixture factory, transported by a dump truck, and paved with the mixture supplied to a hopper on a screed side. Since the outer plate was made of a sheet material such as an iron plate, the outer plate lacked heat retention.

[0003]

By the way, the mixture is required to be paved within a preset temperature range.
For this reason, when performing pavement work in a cold season such as winter, the temperature of the mixture is remarkably lowered, and the density is insufficient at the time of pavement and the finished surface is likely to be defective. And this tendency is remarkable in the drainage pavement mixture excellent in drainage. In this drainage pavement mixture, instead of densely laying the mixture as in the conventional mixture, the mixture is laid in a three-dimensional stitch structure, and a gap is formed between the mixture. It is provided with a drainage function on the asphalt pavement surface, and by adopting this,
Suitable not only for drainage function but also for safe running of the vehicle, such as noise suppression effect that suppresses tire noise during running of the vehicle due to high speed by taking in the gap between the mixture and prevention effect of tire slip when running in rainy weather It has a great effect and is used frequently recently. As the drainage pavement mixture becomes more strict, the temperature control of the upper and lower limits at the time of laying is required to be stricter, and in the conventional hopper, the heat of the mixture is easily dissipated to the outside air via the outer plate. The larger the size of the hopper becomes, the more serious it becomes, which hinders a reliable pavement work, and there is a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve these problems in view of the above situation, and has an outer plate of a hopper into which a heated asphalt mixture is charged. The unit is provided with a heat retaining means. In this device, the heat retaining means is provided on at least one of the inner and outer surfaces of the hopper outer plate, or the outer plate has a double plate structure with a gap, and is provided in this gap,
Alternatively, it is configured to be any of them.
In addition, the heat retaining means is implemented by using a heat insulating material, a heat medium, an electric heating element, or a vacuum in the gap between the double plates. Further, when the heat retaining means is a heat medium, the heat medium is exhaust gas from the engine or a heat medium heated by a heating device provided on the screed side or in the hopper. The present invention, by adopting the above configuration, prevents the heat of the mixture put into the hopper from dissipating through the hopper outer plate, thereby increasing the efficiency of the pavement operation.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a body of a crawler traveling type asphalt finisher. The body 1 is provided in a driver's seat 2 for an operator to perform a driving operation, and is provided at a front portion of the driver's seat 2. A hopper 3 to be thrown in from a truck, a bar feeder 4 provided at the center in the left-right direction of the hopper 3 for conveying the mixture backward, and for uniformly spreading the mixture conveyed backward by the bar feeder 4 to a pavement width. As before, each of which is composed of various member devices such as a screw spreader 5 and a screed 6 with a tamper that is disposed behind the screw spreader 5 and compacts the mixture.

The hopper 3 is provided with a pair of outer plates 7 having a substantially L-shape as viewed from the front on the left and right with the bar feeder 4 interposed therebetween. When the bottom plate surface is substantially parallel to the bar feeder 4 (usually, the mixture is charged in this position), the left and right outer sides are lifted up, and the mixture can be transformed into a posture of sliding down the mixture to the bar feeder 4 side. It has become.

The outer plate 7 is provided with a heat retaining means. The following form is illustrated as an example of the heat retaining means. First, as a first embodiment, as shown in FIG. 3, the outer plate 7 has an inner / outer double plate 9, 10 structure having a gap, and a heat insulating material 11 is interposed in the gap. As the heat insulating material 11 to be interposed here, a heat-resistant material that does not melt or deform due to the heat of the composite material is required, such as rock wool, vermiculite (permuculite), Amorphous inorganic materials such as diatomaceous earth, heat-resistant fiber materials such as glass fiber and ceramic fiber, inorganic foam materials such as foam glass and foamed permucurite, woven fabric materials woven from the fiber materials, and fire-resistant bricks with heat insulation A single material or a plurality of materials such as materials can be adopted. And when these are adopted, the inner and outer double plate 9,
By providing a partition 12 at 10 to partition a plurality of gaps and filling each partition chamber with a heat insulating material 11, the strength of the outer plate 9 can be increased. On the other hand, when the heat insulating material 11 is of an irregular shape, it is preferable to fill the space between the double plates 9 and 10 with a heat-resistant bag, but it is preferable from the viewpoint of workability. Needless to say, it may be configured to be filled. When a woven fabric material is used, it may be a layered material having a large number of layers or a thickly woven fabric. Further, when an inorganic foamed material is used, a material having a higher closed cell rate is more excellent in heat insulating properties, but a material having a lower closed cell rate can be used. In the case of a fixed form such as an inorganic foamed material or a refractory brick, a mold formed in advance into a mounting shape, or a member formed into a required shape by cutting or cutting is mounted.

In a second embodiment, when the outer plate 7 has an inner / outer double plate 9 or 10 structure, exhaust gas of an engine (not shown) is introduced as a heat medium to keep heat. Can be configured. In this case, as shown in FIG. 4, it is preferable to form a ventilation passage between the inner and outer double plates 9 and 10 so that exhaust gas can pass through the outer plate 7 as a whole. Therefore, partition 1 for forming the air path
3 needs to be interposed between the double plates 9 and 10.

The heat medium introduced into the ventilation passage is not limited to exhaust gas, but is a heat medium (hot air or hot oil) heated by a heating device (not shown) provided in the screed 6 or the like.
Can be introduced. In this case, as the heating device, by using the heat from the heating device provided in the screed 6, the device can be shared, but it is needless to say that a dedicated heating device may be separately mounted. It is. In the drawing, 14 is a pipe for introducing a heat medium,
Reference numeral 15 denotes a discharge port for discharging exhaust gas to the outside. Furthermore, when the outer plate 7 has a double plate 9, 10 structure, the double plate 9, 10 tube can be evacuated to ensure heat insulation.

Further, as a third embodiment of the heat retaining means, as shown in FIG. 5, an electric heating element 16 such as a nichrome wire, a sheet heating element or the like may be laid on the outer plate 7 to be implemented. Can be. As the electric heating element 16, the inner and outer double plates 9, 10
The present invention is not limited to a configuration in which the cable is laid in between and is not exposed to the outside, and may be laid on the inner surface and the outer surface of the outer plate 7. In this case, it is preferable to coat with an appropriate coating material so that an operator or the like does not accidentally come into contact with the electric heating element 16, and as such a coating material, it is preferable to adopt the above-mentioned heat insulating material by sticking or the like. Further, as a fourth embodiment, a heat insulating function is provided by attaching any one of the above-described heat insulating materials to at least one of the inner and outer surfaces of the outer plate 7 (the inner surface in the embodiment shown in FIG. 6). However, when affixing to the inner surface, it is necessary to have a strength that does not cause deformation or breakage due to the input or movement of the mixture, and a brick is suitable as such.

In carrying out the present invention, not only one of the embodiments but also a plurality of them can be carried out simultaneously. As an example of such a combination, for example, as described above, in addition to the one using an electric heating element and a heat insulating material, a form in which a heat insulating material is laid on at least one of the inner and outer surfaces of the outer plate 7 and the inner and outer gaps, There are a form in which the above-mentioned various heat retaining means are implemented in the gap between the heavy plates 9, 10, and a form in which a heat insulating material is laid on at least one of the inner and outer surfaces of the outer plate.

In the embodiment of the present invention as described above, the heat of the mixture can be prevented from being dissipated to the outside air through the outer plate 7 and the mixture can be prevented. Cooling can be effectively suppressed, and work efficiency of pavement work can be increased.

[Brief description of the drawings]

FIG. 1 is a side view of an asphalt finisher.

FIG. 2 is a plan view of an asphalt finisher.

FIG. 3 (A) is a perspective view of an important part of a hopper with a notch,
(B) is a sectional view of a main part.

FIG. 4 is a perspective view of a main part of the second embodiment.

FIG. 5 is a perspective view of a main part of a third embodiment.

FIG. 6 is a perspective view of a main part of a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airframe main body 3 Hopper 4 Bar feeder 5 Screw spreader 6 Screed 7 Outer plate 9 Double plate 10 Double plate 11 Insulation material 12 Partition 13 Partition

Claims (4)

[Claims] 1. A hopper heat retaining device for an asphalt finisher, comprising a heat retaining means on an outer plate portion of a hopper into which a heated asphalt mixture is charged. 2. The heat retaining means according to claim 1, wherein the heat retaining means is provided on at least one of the inner and outer surfaces of the hopper outer plate, or the outer plate has a double plate structure having a gap, and is provided in this gap. Hopper warmer for asphalt finisher. 3. An asphalt finisher hopper heat retaining device according to claim 1, wherein the heat retaining means is a heat insulating material, a heat medium, an electric heating element, or a vacuum formed in a gap between the double plates. 4. In the case where the heat retaining means is a heat medium, the heat medium may be exhaust gas of an engine or an asphalt finisher which is a heat medium heated by a heating device provided on a screed side or in a hopper. Hopper warmer.