JP2004263405A - Auxiliary heating device attached leveling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auxiliary heating device attached leveling device so as to uniform a temperature of a screed. <P>SOLUTION: The auxiliary heating device 11 has a heating section 12 and a magnet 16 as a fixed means. An arm 18 is rotatably connected to one end section of the auxiliary heating device 11, and the other end section of the arm 18 is rotatably connected to a part of the screed 10. The arm 18 is at least a pair. The auxiliary heating device 11 is magnetically placed at a heating position of the lower surface of the screed 10 in the case it is used. After it has been used, it is removed from the lower surface by operation of an operator with a support of the arm 18, and it is rotated upward to store in a storage position (shown in a dashed line) on the back side of the screed 10. Since the screed becomes a uniform predetermined temperature from a working state point, there is no occurrence of inconvenience in a paving leveling surface, and there is no rework or repair so that the cost is decreased. Good quality such as the secureness of the improvement of flatness or the uniform skid resistance or the like can be obtained to result in quality improvement. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an asphalt finisher spreading device (hereinafter, referred to as “screed”) used for spreading an asphalt mixture in road pavement.
[0002]
[Prior art]
Conventionally, when asphalt pavement is constructed, the asphalt mixture is spread by screed of an asphalt finisher. 6 is a side view of the asphalt finisher, FIG. 7 is a plan view of the same, and FIG. 8 is a side view of a screed. As shown in FIG. 6, a pair of left and right endless tracks as a traveling device 3 is attached to a lower surface side of the vehicle body 2 of the asphalt finisher 1. A hopper 4 receiving the asphalt mixture from a supply unit (not shown) is disposed on the front upper surface side of the vehicle body. At the lower part of the vehicle body 2, a transporting means 8 (bar feeder) for transporting the asphalt mixture from the hopper 4 to the rear of the vehicle body is provided. Behind the vehicle body 2, a screw conveyor 9 (screw spreader) for spreading and spreading the asphalt mixture supplied on the roadbed in both the left and right directions of the vehicle body 2 perpendicular to the traveling direction is provided. A screed 10 is provided to spread the asphalt mixture spread to a predetermined thickness.
[0003]
As shown in FIG. 7, the screed 10 includes a main screed 10a, and extension screeds 10b, 10b provided at both ends of the main screed 10a so as to be extendable. As shown in FIG. 8, the screed 10 on which the asphalt mixture is spread has a vibrator 6 and a heater 7 serving as compacting means.
[0004]
In general, the construction width when using the asphalt finisher having such a structure is 2. It is about 5 to 11 m. In the construction, it was expected that by uniformly heating the screed 10 with the heater 7, the asphalt mixture could be evenly spread evenly without adhering the asphalt mixture to the screed 10 as much as possible.
[0005]
Prior art document information on an asphalt finisher provided with a screed having such a heating device includes, for example, the following.
[0006]
[Patent Document 1]
JP-A-8-239804
Patent Document 1 describes an automatic screed heating device. In this automatic heating device, a plurality of auxiliary burners are attached to a screed in order to quickly heat a base plate of a screed provided in an asphalt finisher at the start of work. The ignition of this auxiliary burner is performed manually, and the digestion is performed automatically.
[0008]
However, since the screed 10 has a complicated structure such as a central portion of the main screed 10a and a joint portion of the extension screed 10b and is hardly heated, uneven heating of the screed surface of these portions is likely to occur. It is a fact that distortion may occur at irregular intervals or a temperature difference may occur on the screed surface.
[0009]
For this reason, the asphalt mixture adheres to the screed in a portion where the temperature of the screed is low or in a portion where the screed is distorted, and there is a problem that a trace is formed on a finished surface when the asphalt mixture is spread and leveled. As a result, the texture of the asphalt pavement surface becomes uneven, which adversely affects the slip resistance of the road surface, the traveling performance of the vehicle, the durability of the road surface, and the like. Such a phenomenon occurs when the temperature of the screed is not uniform at the time of starting the pavement work, and is remarkably observed when the construction width is wide. In particular, on highways, car driving performance test roads, and auto race tracks where the construction width is about 8 to 10 m, high quality is required for the texture of asphalt pavement surface, and it is related to quality such as road surface flatness. Care must be taken to control the temperature of certain screeds.
[0010]
Therefore, conventionally, in order to solve these problems, even when asphalt pavement is performed with an asphalt finisher having a screed provided with a heating device, not only the heating device but also a hand burner operated by a worker manually. Is also used to supplementarily heat a low-temperature portion, such as the above-described joint portion, which is difficult to be heated.
[0011]
[Problems to be solved by the invention]
However, when the screed is manually heated by a hand burner, there are the following problems.
(1) Uneven heating is likely to occur.
(2) Since the temperature of the burner cannot be controlled, it is overheated and induces deformation of the heating part. (3) Devices around the heating section (for example, hydraulic hoses, electric wiring, etc.) are erroneously heated and damaged.
(4) Since a plurality of locations are heated simultaneously, labor is required. In addition, when heating alone, there are a plurality of heating locations, and the location heated first cools down during subsequent heating.
[0012]
The present invention has been made in view of such circumstances, and has as its object to provide a spreading device provided with an auxiliary heating device so that the temperature of a screed becomes uniform over the entire width.
[0013]
[Means for Solving the Problems]
The spreader with an auxiliary heating device according to claim 1 is provided on an asphalt finisher for spreading an asphalt mixture, and the auxiliary heater is detachably attached.
[0014]
According to the spread leveler with the auxiliary heating device, the temperature distribution of the screed in a direction substantially perpendicular to the pavement direction can be made uniform.
[0015]
Generally, a screed is composed of a central main screed and left and right extension screeds.The central part of the main screed, the joint between the main screed and the left and right extension screeds, and the outer end of the extension screed are structurally different. It is the part where the temperature does not easily rise. According to the present invention, these portions where the temperature is unlikely to rise are heated beforehand by the auxiliary heater detachably mounted on the screed before starting the pavement, so that the temperature distribution of the screed is made uniform and the pavement finish is completed. The surface can be improved.
[0016]
Conversely, if the temperature distribution of the screed at the start of paving is not uniform, drag marks will be formed on the finished surface of the pavement, and it will take a lot of labor and time to repair (repair) the quality, and Significantly reduced. Further, in some cases, the pavement must be completely redone, resulting in a significant increase in cost.
[0017]
Generally, the screed is heated by the heat of the asphalt mixture (temperature of about 150 to 160 ° C.) as time elapses after the start of pavement, so that the temperature becomes uniform and a good finished pavement surface is obtained, so that an auxiliary heating device becomes unnecessary. Therefore, the auxiliary heating device according to the present invention may be removed or stored as soon as the screed reaches a predetermined temperature before the start of work.
[0018]
Further, the spreader with an auxiliary heating device of the present invention can be configured such that in the spreader with an auxiliary heating device, the auxiliary heating device is attached to the spreader with a magnet.
[0019]
Further, the spreader with an auxiliary heating device according to the present invention is the spreader with an auxiliary heating device of a magnet detachable type, wherein the auxiliary heating device is connected to the spreader via an arm and a support shaft. Then, it can be configured to be swingable between a heating position where it is magnetically attached to the lower surface of the spreading device and a storage position other than the lower surface.
[0020]
Further, the spreader with an auxiliary heating device of the present invention is the spreader with an auxiliary heating device of a magnet detachable type, wherein the auxiliary heating device includes a plate-shaped heating unit and a pair of opposed heating units. And support magnets provided on the side surfaces of the support arm, and columnar magnets provided on the support arm so as to be adjustable in position.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a spreader with an auxiliary heating device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1A is a side view of an asphalt finisher spreader (screed 10) equipped with an auxiliary heating device 11 according to an embodiment of the present invention, FIG. 1B is a front view thereof, and FIG. FIG. 3 is a side view of the auxiliary heating device 11, FIG. 4 is an electric system diagram of the auxiliary heating device 11, and FIG. 5 is an asphalt finisher to which the auxiliary heating device 11 according to another embodiment of the present invention is attached. FIG. 3 is a side view of the spreading device (screed 10).
[0022]
The asphalt finisher provided with the spreader with the auxiliary heating device of the present example is the same as the conventional asphalt finisher described above except for the configuration of the auxiliary heating device 11 which is detachable from the surface to be heated of the spreader. And has a common function in that the asphalt mixture is spread in the width direction of the road and spread evenly to a predetermined thickness.
[0023]
As shown in FIG. 1, the auxiliary heating device 11 attaches a magnet or the like to a portion where the temperature of the screed 10 is hard to rise, such as a joint portion between the main screed 10a and the extension screed 10b or an end of the extension screed 10b. Attach by
[0024]
As shown in FIGS. 2 and 3, the auxiliary heating device 11 has a rectangular plate-shaped heating unit 12 as a main body. The front surface of the heating unit 12 is a heating surface, and a rectangular base 13 is attached to the center of the back surface. The rectangular plate-shaped (planar) heating part is efficiently heat-conducted by closely contacting the surface to be heated, allowing accurate temperature control, and may cause distortion without overheating. Absent. A pair of support arms 14 is provided on each of a pair of side surfaces of the base 13 corresponding to a pair of long sides of the heating unit 12. Each support arm 14 is substantially L-shaped, and its distal end is extended until it reaches substantially the same plane as the surface of the heating unit 12. A long hole 15 is formed at the tip of each support arm 14 in a direction perpendicular to the surface of the heating unit 12.
[0025]
A columnar magnet 16 is mounted between the distal ends of the pair of support arms 14. That is, rotating shafts 17 protrude from both end surfaces of the cylindrical magnet 16, respectively, and the rotating shafts 17 rotatably engage with the elongated holes 15 of the support arm 14. Therefore, the magnet 16 held between the pair of support arms 14 is rotatable and can move up and down along the elongated hole 15.
[0026]
As shown in FIG. 3, when the rotating shaft 17 is located at the center of the long hole 15, the dimensional relationship is such that the top of the magnet 16 substantially matches the surface of the heating unit 12.
[0027]
Further, although not shown in detail, fixing means such as fixing screws are provided at both ends of the rotating shaft 17 of the magnet 16. In the above, the magnet 16 can be fixed between the pair of support arms 14. In this fixed state, the magnet 16 cannot rotate between the pair of support arms 14, and is prohibited from moving up and down along the elongated hole 15.
[0028]
Since the auxiliary heating device 11 of this example has the magnet 16 whose position can be adjusted as described above, it is attached to the lower surface of the screed 10 in a state where the heat conduction of the heating unit 12 is optimal, as shown in FIG. Thus, the positions of the pair of magnets 16 can be adjusted and fixed respectively. In this case, the pair of magnets 16 can be adjusted respectively, and the one magnet 16 can be fixed with a slight inclination between the pair of support arms 14. Therefore, the heating section 12 can be attached to a joint or the like on the lower surface of the screed 10 in an optimal state for heat conduction.
[0029]
FIG. 4 is an electric system diagram of the auxiliary heating device 11 of the present example. The auxiliary heating device 11 of this example is provided with an electric heater in the heating unit 12 and is connected to the generator 30 via the relay box 20. In the illustrated example, a plurality of (five) auxiliary heating devices 11 are energized and heated at the same time. However, in this case, it is difficult to heat the main screed 10a and the extension screed 10b in the asphalt finisher. Can be dealt with even when there are many.
[0030]
Generally, at the start of the pavement work, the temperature of the asphalt mixture put into the hopper of the asphalt fisher 1 decreases from the bar feeder to the screed 10 through the screw spreader. Drag marks are generated, and problems are likely to occur. Therefore, before the pavement work, the auxiliary heating device 11 of the present embodiment is mounted in advance on the portion where the temperature of the screed 10 is hard to rise as described above, and the lower surface of the screed 10 is approximately 100 to 120 ° C. in combination with the heater 7 for heating. Heat to become. When the lower surface of the screed 10 reaches a substantially predetermined temperature, the auxiliary heating device 11 is removed from the lower surface of the screed 10, and pavement is started according to the asphalt pavement construction procedure.
[0031]
As the auxiliary heating device 11 of the present invention, the electric heater or the like shown in FIG. 4 is used, but the present invention is not limited to this, and can be attached to the lower surface of the screed 10 and heats the screed 10 to a predetermined temperature. The heating principle is not limited as long as it is possible. In addition, a thermostat or an overheating prevention device may be used to control the heating temperature of the screed.
[0032]
FIG. 5 is a side view of an asphalt finisher leveling device (screed 10) to which an auxiliary heating device 11 according to another embodiment of the present invention is attached. Here, the configuration of the auxiliary heating device 11 itself is substantially the same as that of the first example shown in FIG. The auxiliary heating device 11 of the present example differs from the first example in the mounting structure for the screed 10.
[0033]
As shown in FIG. 5, the auxiliary heating device 11 of this example has an arm 18 rotatably connected to one end thereof, and further has a rotatable other end connected to a part of the screed 10. Is what is being done. The arms 18 are at least one pair, and are provided at both ends of the auxiliary heating device 11 in the width direction (the depth direction in FIG. 5).
[0034]
In use, the auxiliary heating device 11 is arranged at a heating position where it is magnetically attached to the lower surface of the screed 10. After use, it is detached from the lower surface by the operation of a worker with the arm 18 as a support, and is rotated upward to be stored in a storage position other than the lower surface, for example, a storage position on the back side of the screed 10 (shown by a broken line). ). That is, the auxiliary heating device 11 of this example connected to the screed 10 by the arm 18 can swing between the heating position and the storage position.
[0035]
The auxiliary heating device 11 of the first example was detached each time it was used. In this example, the auxiliary heating device 11 was attached to the lower surface of the screed 10 with the magnet 16 when used. It can be lifted as it is and fixed at a position where it does not hinder the work, so that the usability is good.
[0036]
【The invention's effect】
As described above, according to the spreader with the auxiliary heating device according to the present invention, since the screed is at a uniform predetermined temperature at the start of work, no problem occurs on the pavement spreader. This eliminates the need for manual rework and rework, which contributes to cost reduction.
[0037]
In addition, it is possible to obtain good quality such as improvement in flatness and securing uniform slip resistance, which leads to improvement in quality. In terms of the mechanical structure, it is not necessary to heat a portion where the temperature of the screed is slowly rising by a manual burner such as a hand burner. Further, in the conventional heating method, the other portion is overheated and the entire screed is distorted by waiting until the temperature of the portion where the temperature rises slowly rises. Absent. Therefore, it also contributes to the reduction of maintenance costs mechanically.
[Brief description of the drawings]
1A is a side view of an asphalt finisher spreader (screed) equipped with an auxiliary heating device according to a first embodiment of the present invention, and FIG. 1B is a front view thereof.
FIG. 2 is a plan view of an auxiliary heating device according to the first embodiment of the present invention.
FIG. 3 is a side view of the auxiliary heating device according to the first embodiment of the present invention.
FIG. 4 is an electric diagram of an auxiliary heating device according to the first embodiment of the present invention.
FIG. 5 is a side view of an asphalt finisher spreader (screed) equipped with an auxiliary heating device according to another embodiment of the present invention.
FIG. 6 is a side view of a conventional asphalt finisher.
FIG. 7 is a plan view of a conventional asphalt finisher.
FIG. 8 is a side view of a screed of a conventional asphalt finisher.
[Explanation of symbols]
1: asphalt finisher, 2: body, 3: traveling device,
10: screed as spreading device, 10a: main screed,
10b: extension screed, 11: auxiliary heating device, 12: heating unit,
14 ... support arm, 15 ... long hole, 16 ... magnet, 17 ... rotary shaft

Claims (4)

A spreading device with an auxiliary heating device, which is provided on an asphalt finisher for spreading an asphalt mixture and has an auxiliary heating device detachably attached thereto. The spreading device with an auxiliary heating device according to claim 1, wherein the auxiliary heating device is attached to the spreading device with a magnet. The auxiliary heating device is connected to the spreading device via an arm and a support shaft, and can swing between a heating position magnetically attached to a lower surface of the spreading device and a storage position other than the lower surface. 3. The spreading device with an auxiliary heating device according to claim 2, wherein the spreading device is configured so as to be formed as follows. The auxiliary heating device has a plate-shaped heating unit, a support arm provided on each of a pair of side surfaces of the heating unit facing each other, and a columnar heating unit provided so as to be adjustable in position on the support arm. The spreader with an auxiliary heating device according to claim 2, further comprising a magnet.

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