JP2872049B2 - Heating device for strike-off plate of asphalt finisher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a screw section for leveling an asphalt mixture in an asphalt finisher. When paving in a cold region, the asphalt mixture is cooled and adheres to the strike-off plate, thereby causing dragging scratches and rough skin on the finished pavement surface.The present invention solves such a problem. And a heating device for a strike-off plate of an asphalt finisher.

[0002]

2. Description of the Related Art FIG. 1 is a schematic side view of an asphalt finisher. 1 is the asphalt finisher body, 2
Is a hopper mounted on the front part of the main body 1 and supplied with an asphalt mixture 4 from a dumper-3 or the like. Reference numeral 5 denotes a screw section.

Generally, a screw portion 5 of an asphalt finisher comprises a strike-off plate 7 mounted on a deflector plate 6, a tamper 8 and a screw 11, as shown in FIG. These are connected to each other so that the lower end surfaces (asphalt expansion surfaces) are substantially equal to each other. Then, the asphalt mixture 4 sent from the hopper 2 to the bar conveyor 9 and spread to a predetermined width by the screw auger 10 is spread and spread to a uniform thickness. However, the asphalt mixture 4, particularly the asphalt mixture used for pavement in heavy snowy areas, is a wear-resistant asphalt mixture due to the use of spike tires or chains. This abrasion resistant asphalt mixture is compared to ordinary asphalt mixture,
The asphalt content is high and the viscosity is high.

[0004] The conventional asphalt finisher has a screw portion 5 as shown in FIG. That is, a tamper 8 is disposed between the strike-off plate 7 and the screw 11, and the tamper 8 applies vertical vibration by a vibration generating device such as an eccentric shaft 13 driven by a driving device 12. Then, the asphalt mixture 4 spread in the width direction is rolled.

A strike-off plate 7 and a screw 1
1 is separated by the tamper 8, the heat generated by the heating device 14 of the screw section 1 is not sufficiently transmitted to the strike-off plate 7, and the strike-off plate 7 and the tamper The material (asphalt mixture 4) adheres to the surface 8 and the surface (paved surface) is likely to be dragged (cracked surface scratches) on the spread surface (paved surface). In particular, pavement in cold regions (Hokkaido) is a cause of difficult to overlook troubles.

As a known technique for solving the above-mentioned drawbacks, as shown in FIG. 3, hot air after heating a screw 11 is provided with an opening 15 in front of the front and rear screws 11 to form an opening. There is a device in which hot exhaust air sent through the hopper is heated by being applied to a tamper 8 and a strike-off plate 7. However, this resulted in insufficient heating of the tamper 8 and strike-off plate 7.

[0007] Japanese Patent Publication No. 60-16525 discloses FIG.
As shown in FIG. 7, the tamper and the strike-off plate are integrally formed to form a strike-off plate and a tamper 16, so that the tamper surface can be substantially expanded, and the strike 11 and the strike-off plate It is described that the heat in the screw 11 is sufficiently transmitted to the strike-off plate by communicating the heat and the tamper 16 with the hole 16a. However, in the present invention, when the tamper surface is expanded, the repulsive force from the lower road surface increases during thin-layer pavement, the screw portion abnormally vibrates, and the cause of occurrence of poor pavement surface and the like. There was a fear.

[0008]

In view of the problems of the prior art, in the case of a road pavement in a cold region, the strike-off plate is discharged after heating the screw to prevent the pavement surface from being damaged. It is an object of the present invention to provide a strike-off plate heating device which can easily modify a delivered machine and can further improve the heating performance.

[0009]

SUMMARY OF THE INVENTION In a screw section 5 of an asphalt finisher in which a tamper 8 is disposed between a strike-off plate 7 and a screw 11 having a heating device 14, a screw is provided. A duct 22 is connected between the strike 11 and the strike-off plate 7 provided in front of the tamper 8 so that the strike-off plate 7 is heated by exhaust heat after heating the screw 11. In the apparatus for heating a strike-off plate of an asphalt finisher according to the present invention, a duct 22 for connecting the upper part of the screw 11 and the strike-off plate 7 connected to the front of the tamper 8 is provided. A strike-side plate 22a fixed above the strike-side plate 22 and a strike-side plate 22b fixed above the strike-off plate 7;
The connection between the screw side duct 22a and the strike off plate side duct 22b can absorb the relative vertical movement of the strike off plate 7 and the screw 11 and the tilting movement of the strike off plate 7. In addition, it has a structure capable of maintaining airtightness.

One duct 22a and the other duct 22b
Is inserted, and an annular closing plate 23 fitted into one duct 22a and a coil spring 24 constitute an air-tight holding structure of a connection portion.

A duct connecting the screw 11 and the strike-off plate 7 provided in front of the tamper 8 is constituted by a spiral cover 25.

The duct connecting the screw 11 and the strike-off plate 7 provided in front of the tamper 8 is constituted by a flex tube 26.

The strike-off plate 7 and the heating device 14
In a screw section 5 of an asphalt finisher having a tamper 8 disposed between the screw 11 and a strike 11 having a strike-off plate 7 provided in front of the screw 11 and the tamper 8. A strike-off plate heating device of an asphalt finisher in which a strike-off plate 7 is heated by exhaust heat after heating the screw 11 is provided. The screw 11 is held in the hollow portion inside
Of the duct 20, one end of the duct 20 is attached to the screw 11 by a duct 22, a retractable duct 22a, 22b, a duct composed of a spiral cover 25 or a flex tube 26. Small holes 21 are provided at substantially constant intervals on the lower surface of the duct 20 in the strike-off plate 7 so that the lower surface 7a of the strike-off plate 7 can be uniformly heated.

A strike-off plate 7 and a heating device 14
In a screw section 5 of an asphalt finisher having a tamper 8 disposed between the screw 11 and a strike 11 having a strike-off plate 7 provided in front of the screw 11 and the tamper 8. In a heating device for a strike-off plate of an asphalt finisher in which the strike-off plate 7 is heated by exhaust heat after heating the screw 11, the screw portion is located at the center. A front screw portion 5a and a rear screw portion 5b provided in a left and right pair behind the front screw portion 5a.
Ducts are provided for the front part 5a and the right and left rear parts 5b, respectively, so that the screw 11 is heated by exhaust heat after heating.

Strike-off plate 7 and heating device 14
In a screw section 5 of an asphalt finisher having a tamper 8 disposed between the screw 11 and a strike 11 having a strike-off plate 7 provided in front of the screw 11 and the tamper 8. In a heating device for a strike-off plate of an asphalt finisher, in which a strike-off plate 7 is heated by exhaust heat after heating the screw 11, a screw portion is provided at a front end. Rear screw that makes a left and right pair with the part screw 5a
And a duct 22 described as the screw 11 on the front screw part 5a, and plug-in ducts 22a, 2 on the left and right rear screw parts 5b.
2b, or spiral cover 25 or flex tube 26 was applied.

The strike-off plate 7 and the heating device 14
In a screw section 5 of an asphalt finisher having a tamper 8 disposed between the screw 11 and a strike 11 having a strike-off plate 7 provided in front of the screw 11 and the tamper 8. In a heating device for a strike-off plate of an asphalt finisher, in which a strike-off plate 7 is heated by exhaust heat after heating the screw 11, a rear screw portion 5b is provided. Plug-in ducts 22a and 22b, and plug-in ducts 22a and 22b for the front screw 5a.
Spiral cover 25 or flex tube 26 was applied.

A strike-off plate 7 and a heating device 14
In a screw section 5 of an asphalt finisher having a tamper 8 disposed between the screw 11 and a strike 11 having a strike-off plate 7 provided in front of the screw 11 and the tamper 8. In a heating device for a strike-off plate of an asphalt finisher in which a strike-off plate 7 is heated by exhaust heat after heating the screw 11, a front screw portion is provided. A plug-in duct 22a, 22b, spiral cover 25 or flex tube 26 is applied to 5a and left and right rear screw portions 5b.

[0018]

Embodiment 1 Hereinafter, a description will be given with reference to FIGS. FIG.
7 is a cross-sectional view of FIG. In FIG. 5, the screw section 5 is composed of a strike-off plate 7 and a tamper 8 disposed between a strike 11 having a heating device 14. The screw 11 is communicated with a strike-off plate 7 provided in front of the tamper 8 through a duct 17. The duct 17 is provided at an end of the screw 11. In this duct 17, the lower surface 11a of the screw 11 and the lower surface 7a of the strike-off plate 7 move up and down relatively, and the attack angle α of the lower surface 7a of the strike-off plate 7 can be changed. It is configured to be able to follow movement. That is, a gap 18 (FIG. 5) is provided between the vertical movement and the frame of the screw portion, and a width is provided in the strike-off plate 7 when the attack angle α is changed. The strike-off plate 7 is rotatable around a central axis 19 of a duct 20 (FIG. 6) provided in the direction. In addition, blocking plates are provided at both ends of the strike-off plate 7, and the inside is hollow.

Further, the duct 20 held in the hollow portion of the duct 17 extends over almost the entire width of the screw 11 in order to enhance the thermal efficiency in the strike-off plate 7, and the duct 17 is provided at one end. Is connected to On the lower surface of the duct 20, a number of small holes 21 for discharging hot air are provided. That is, the small holes 21 are provided at substantially constant intervals over the entire length of the duct 20, and the lower surface 7a (FIG. 5) of the strike-off plate 7 is uniformly spread to every corner by the hot air discharged downward from the small holes 21. Heat. still,
The discharged hot air is exhausted to the outside through an exhaust port provided at one end of the duct 17 (FIG. 6B).

The present invention is configured as described above. In FIG.
The asphalt mixture 4 sent to the mower 10 is spread in the width direction by the screw auger 10, cut to a uniform thickness by the strike-off plate 7, and reaches the screw portion 5 to the tamper 8. After being compacted and expanded by the squeezing method, it is finished with the screw 11.

As described above, according to this embodiment,
Particularly, in a cold region, since the strike-off plate 7 and the screw 11 are communicated with each other through the duct 17, the heat of the screw portion 5 is sufficiently transmitted to the strike-off plate 7 side, and Since the temperature is maintained, the asphalt mixture 4 cools and does not adhere to the lower surface 7a of the strike-off plate 7. For this reason, it is possible to prevent the occurrence of drag scratches and rough skin on the finished pavement surface.

[0022]

Embodiment 2 A description will be given based on FIGS. This embodiment is another embodiment of the duct 17 in FIG. That is, the screw 11 and the tamper
The strike-off plate 7 connected in front of 8 is in communication with the strike-off plate 7 through a duct 22. This duct 22 has a strike-off plate and a screw-side duct 22a fixed to the upper part of the screw 11 (the position thereof is not particularly limited).
A strike-off plate side duct 22b fixed to the upper part of the strike-off plate 7 side, and the connection between the duct 22a and the duct 22b is formed by the relative vertical movement of the strike-off plate 7 and the screw 11 and the strike-off plate. -It is configured as follows to absorb the tilting movement of the gate 7 and to maintain the airtightness.

One duct 22a and the other duct 22b
Is an insertion type (nesting type), and a part of the duct 22b side is an enlarged duct portion 22'b (an oval D). In consideration of the relative vertical movement and the tilting movement, the expansion amount of the expansion duct portion 22'b is set to a size that does not interfere with one of the ducts 22a (diameter d <oval D). In order to maintain the airtightness of the connecting portion, an annular closing plate 23 is slidably fitted into one of the small-diameter side ducts 22a, and the other duct is pressed by a pressing force of a coil spring 24 similarly fitted into the duct 22a. 22b
(See FIG. 9 (b)).

With the above construction, the duct 22
Even if there is a relative vertical movement and a tilting movement in b, the airtightness of the connection part can be always maintained by the bending of the coil spring 24 and the following of the closing plate 23, thereby reducing the escape amount of the hot air and increasing the thermal efficiency. be able to.

[0025]

Third Embodiment In FIG. 10, a spiral cover 25 is provided instead of a structure in which a duct 22b is inserted into the above-mentioned duct 22a and airtightness is maintained by a closing plate 23, and a strike-off plate is formed. This is an example in which 7 sides are connected. The spiral cover 25 makes it possible to follow the relative vertical movement and tilting movement of this portion. FIG. 11 shows a case where a flex tube 26 is provided instead of the spiral cover 25. Also in this case, the flexibility of the flex tube 26 makes it possible to follow relative vertical movement and tilting movement. In any of the ducts and the like, heat is dissipated in the bent portions and heat is consumed, so that it is necessary to minimize the number of bending points of the duct.

The duct 20 in the strike-off plate 7 is connected to the duct 22, the combination of the duct 22a and the duct 22b, the spiral cover 25 or the flex tube 26 in the second and third embodiments. Of course, it is possible.

The duct connecting between the screw 11 and the strike-off plate 7 has been described above. Generally, as shown in FIG. 6, the asphalt finisher has a central front part 5a and a rear part 5a. It is composed of a rear screw part 5b provided as a left and right pair. In the screw part having such a configuration, the duct 17 as shown in FIG. 5 is provided for each of the front part 5a and the right and left rear parts 5b. 5a
The duct 17 shown in FIG. 5 and the duct 22 shown in FIG. 8, the spiral cover 25 shown in FIG. 10 for the left and right rear screw portions 5b, or the duct 17 shown in FIG.
In the case of using the flexible tube 26 shown in (1), the combination or the reverse combination can be considered. With these combinations, the configuration having the best thermal efficiency and operability can be selected and adopted. Further, the duct 22 shown in FIG. 8, the spiral cover 25 shown in FIG. 10, or the flex tube 26 shown in FIG. 11 is applied to the front part 5a and the right and left rear parts 5b. You can also.

[0028]

According to the present invention, since the strike-off plate 7 and the screw 11 are connected by a flexible duct in the screw portion having the conventional structure, the strike-off plate is formed. The heat can be heated by utilizing the exhaust heat after the screw heating. Further strike-off plate 7
In order to enhance the thermal efficiency of the inside, a duct 20 is provided horizontally in the hollow portion of the strike-off plate 7 connected to the duct over almost the entire width of the screw 11, and hot air is blown on the lower surface side of the duct 20. By providing a plurality of small holes 21 for discharging, it is possible to heat the strike-off plate 7 uniformly to every corner with the hot air discharged to the lower surface side.

A duct 20 having a small hole is provided in the strike-off plate 7, which is connected to the screw 11 by a duct, and these are formed into a duct having flexibility. Thus, a more excellent configuration of the screw portion can be obtained, and a very suitable asphalt finisher in a cold region can be provided.

[Brief description of the drawings]

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

FIG. 2 is a partially cut-away side view of a conventional screw part.

FIG. 3 shows another example of the structure of a known screw part.

FIG. 4 is another example of the known screw part.

FIG. 5 is a sectional view showing a structure of a screw portion of the present invention;
FIG. 8 is a sectional view taken along the arrow A in FIG. 7.

FIG. 6 (a) is a plan view of a screw part of an asphalt finisher having a screw part of the present invention, and shows only one half. (b) is an enlarged view of the part viewed from arrow A in (a).

FIG. 7 is a front view of the asphalt finisher.

FIG. 8 is a view of the second embodiment of the present invention, as viewed in the direction of arrow A in FIG.

FIG. 9 is a sectional view of a second embodiment of the present invention.

10A shows an example in which a spiral cover used for a duct is used, and FIG. 10B is a detailed view of the spiral cover.

FIG. 11 is a perspective view of a flexible tube used for a duct.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Asphalt finisher main body 2 Hopper 3 Dumper 4 Asphalt mixture 5 Thread 5a Front screed 5b Rear screed 6 Deflector plate 7 Strike-off plate 8 Tamper 9 Bar conveyor 10 Screw auger 11 Screw 12 Drive unit 13 Eccentric shaft 14 Heating device 15 Opening hole 16 Tamper 17 Duct 18 Clearance 19 Center shaft 20 Duct 21 Small hole 22 Duct 23 Closure plate 24 Coil spring 25 Spiral cover 26 Flex tube

Claims (9)

(57) [Claims] 1. A strike-off plate (7) and a heating device
A screw part (5) of an asphalt finisher in which a tamper (8) is arranged between the screw part (11) having the (14).
A duct (22) extending between the screw (11) and a strike-off plate (7) connected in front of the tamper (8).
In a heating device for a strike-off plate of an asphalt finisher in which the strike-off plate (7) is heated by waste heat after heating the screw (11), ) And a duct (22) connecting the strike-off plate (7) connected in front of the tamper (8) are a screw-side duct fixed to the upper part of the screw (11). (22a) and a strike-off plate-side duct (22b) fixed above the strike-off plate (7), and a strike-side duct (22a) and a strike-off plate.
Connect the connection of the side duct (22b) to the strike-off plate.
The strike-off of an asphalt finisher characterized in that it has a structure capable of absorbing the relative vertical movement of the screw (7) and the screw (11) and the tilting movement of the strike-off plate (7) and maintaining airtightness. Plate heating device. 2. One duct (22a) and the other duct (22b)
2. A strike-off of an asphalt finisher according to claim 1, wherein an annular closing plate (23) fitted into one of the ducts (22a) and a coil spring (24) constitute an airtight holding structure of a connection portion. Plate heating device. 3. A duct for connecting between a screw (11) and a strike-off plate (7) provided in front of a tamper (8) is constituted by a spiral cover (25). The heating device for a strike-off plate of an asphalt finisher according to claim 1, wherein 4. A duct for connecting between a screw (11) and a strike-off plate (7) provided in front of a tamper (8) is constituted by a flex tube (26). The heating device for a strike-off plate of an asphalt finisher according to claim 1, wherein: 5. A strike-off plate (7) and a heating device
A screw part (5) of an asphalt finisher in which a tamper (8) is arranged between the screw part (11) having the (14).
In the above, a duct is provided between the screw (11) and the strike-off plate (7) provided in front of the tamper (8), and heat is discharged after heating the screw (11). In the apparatus for heating a strike-off plate of an asphalt finisher in which the strike-off plate (7) is heated by the step (7), the strike-off plate (7) is held in a hollow portion of the strike-off plate (7), and the screw (11) is held. A duct (20) that covers almost the entire width of
2. One end of said duct (20) is connected to said screw (11).
The duct according to claim 2, the duct according to claim 2, the duct according to claim 3, or the duct according to claim 4, and small holes are provided at substantially constant intervals on the lower surface of the duct (20) in the strike-off plate (7). (21) is installed and the lower surface of strike-off plate (7)
(7a) A heating device for a strike-off plate of an asphalt finisher, characterized in that it can uniformly heat (7a). 6. A strike-off plate (7) and a heating device
A screw part (5) of an asphalt finisher in which a tamper (8) is arranged between the screw part (11) having the (14).
In the above, a duct is provided between the screw (11) and the strike-off plate (7) provided in front of the tamper (8), and heat is discharged after heating the screw (11). In the apparatus for heating a strike-off plate of an asphalt finisher in which the strike-off plate (7) is heated by the above-mentioned method, the screw part is a front part (5a) of a central part,
Rear screw part (5b) provided as a left and right pair behind it
Ducts are provided for the front screw part (5a) and the left and right rear screw parts (5b), respectively, and the heat is applied by the exhaust heat after heating the screw (11). An apparatus for heating a strike-off plate of an asphalt finisher, characterized in that: 7. A strike-off plate (7) and a heating device.
A screw part (5) of an asphalt finisher in which a tamper (8) is arranged between the screw part (11) having the (14).
In the above, a duct is provided between the screw (11) and the strike-off plate (7) provided in front of the tamper (8), and heat is discharged after heating the screw (11). In the apparatus for heating a strike-off plate of an asphalt finisher in which the strike-off plate (7) is heated with a rear part, a screw part forms a left and right pair with a front part (5a). And a duct (22) as claimed in claim 1, wherein said duct (22) is formed on said front screw part (5a) as said screw (11). Plug-in ducts (22a, 22b) according to claim 2 for (5b), claim 3
An apparatus for heating a strike-off plate of an asphalt finisher to which the spiral cover (25) according to (1) or the flex tube (26) according to (4) is applied. 8. A strike-off plate (7) and a heating device
A screw part (5) of an asphalt finisher in which a tamper (8) is arranged between the screw part (11) having the (14).
In the above, a duct is provided between the screw (11) and the strike-off plate (7) provided in front of the tamper (8), and heat is discharged after heating the screw (11). 3. A plug-in duct (22a, 22b) as claimed in claim 2, wherein the strike-off plate (7) is heated by a heating device for a strike-off plate of an asphalt finisher. And a front cover (5a), a plug-in duct (22a, 22b) according to claim 2, a spiral cover (25) according to claim 3, or a flex tube (26) according to claim 4. ). A device for heating a strike-off plate of an asphalt finisher, wherein 9. A strike-off plate (7) and a heating device
A screw part (5) of an asphalt finisher in which a tamper (8) is arranged between the screw part (11) having the (14).
In the above, a duct is provided between the screw (11) and the strike-off plate (7) provided in front of the tamper (8), and heat is discharged after heating the screw (11). In the apparatus for heating a strike-off plate of an asphalt finisher in which a strike-off plate (7) is heated by a pressure, a front screw part (5a) and right and left rear screw parts (5) are provided.
plug-in ducts (22a, 22b) according to claim 2 for b),
An apparatus for heating a strike-off plate of an asphalt finisher to which the spiral cover (25) according to claim 3 or the flex tube (26) according to claim 4 is applied.