JP3447204B2 - Asphalt finisher heating structure in contact with mixture - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt finisher used for pavement of a road, and a mixture contact portion of a screed portion for preventing the mixture from cooling immediately before the expansion. Heating structure. As shown in FIG. 4, an asphalt finisher includes a mixture supply section 7, a traveling section 8, and a screed section 9, and asphalt supplied from a hopper 70 of the mixture supply section 7. The mixed material of the mixture is spread to a uniform thickness while being spread by the screed portion 9 to pave a road. In detail, the process of the screed portion 9 will be described in detail. The supplied mixture is spread and spread to a predetermined width by a screw 91 in front of the deflector plate 90, and a deflector edge (92 shown in FIG. 5).
, And is spread by the tamper and the base plate 94 and spread. Meanwhile, the mixture supplied to the screed 9 is in a heated state, and the base plate 94 is also expanded in a heated state. During this expansion, when the mixture cools and hardens, it adheres to the expansion surface of the base plate 94 and causes an expansion failure, so that the base plate 94 has a structure in which hot air is applied from the inside to prevent it. . In cold regions, the temperature of the mixture tends to decrease before reaching the base plate 94.In particular, the mixture that has accumulated in front of the deflector plate 90 is likely to cool and solidify. Deflector plate 90 in contact
The deflector edge 92 also has a structure in which hot air is blown from the inside thereof. FIG. 5 shows an example of such a heating structure, in which a deflector plate 90 and a deflector edge 92 which come into contact with the mixture are formed in a hollow shape so that hot air flows therethrough, and a base plate 94 is formed there. Is blown through the duct 96 and the insertion hole 97. [0005] However, the heating structure shown in FIG. 5 has a structure in which hot air is only blown into the hollow portions of the mixture contact portions 90, 92, 94, so that the hot air is indiscriminately hollow. It was difficult to achieve uniform heating simply by flowing through the parts, and the heating efficiency was not always good. On the other hand, in JP-A-8-85915,
There is disclosed a technique in which the air duct (corresponding to 96 shown in FIG. 5) through which hot air is inserted is attached over the entire width of a predetermined mixture contact portion, and insertion holes are provided at substantially constant intervals on the lower surface of the air duct. If this technique is applied to each of the mixture contact members, hot air can be blown uniformly, and at least the problem of the structure shown in FIG. 5 is likely to be solved. However, in the technology disclosed in Japanese Patent Application Laid-Open No. 8-85915, the hot air does not always flow evenly through the insertion holes depending on the flow velocity of the hot air. It is difficult to adjust such that sufficient hot air is blown to such a location, and in any case, efficient heating is not performed, so that there is a possibility that cooling of the mixture cannot be effectively prevented. The present invention has been made in view of the above-mentioned problems of the prior art, and has a heating device capable of efficiently heating a mixture contact portion of a screed portion and effectively preventing cooling of the mixture material. It seeks to provide structure. [0009] For this reason, the structure for heating a mixture contact portion of an asphalt finisher according to the present invention is such that the mixture contact portion of the screed portion is formed in a hollow shape, and the hollow portion is heated by hot air. And the mixture contact portion heating structure of the asphalt finisher for heating the mixture contact portion, wherein the base member is removed from the mixture contact portion.
Hot air is circulated upward from below,
While heating from the side, and the lower side inside the hollow
Arrange the baffle so that it becomes
An arbitrary hot air flow path that is directed upward from above is formed. [0010] The hot air flow path has a shape and a size of a mixture contact portion to be formed, and a portion of the mixture contact portion which particularly requires heating (for example, a portion where contact with the mixture is high). ) Is formed by appropriately arranging baffles in consideration of the above factors. For example, in the deflector plate, the frequency of contact with the mixture is higher in the lower part than in the upper part, so that the hollow part in the lower part becomes a flow path in which hot air circulates to all corners and stays for a long time. Arrange the boards appropriately. [0011] In the structure according to the present invention, the hot air blown into the hollow portion does not flow instinctively, but flows along the hot air flow path formed by the baffle plate. The baffle plate increases the residence time of the hot air, and the conduction of heat to the baffle plate improves the heating efficiency of the mixture contact portion. In addition, since the hot air flows along the hot air flow path that is arbitrarily formed, the hot air is surely flown to a location where heating is particularly necessary, and an efficient heating effect can be obtained. If the method of forming the hot air flow path is changed in various ways, uniform heating can be achieved, and a required heating effect can be expected. Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a screed portion of an asphalt finisher. As shown, the screed portion of the present embodiment includes a first telescopic screed portion 2, which extends from the width of the vehicle body in the width direction behind the main screed portion 1 including a deflector plate 10, a deflector edge 11, and a base plate 12, Further, a second telescopic screed portion 3 is provided behind the first telescopic screed portion 2 to further extend in the width direction from the maximum expansion width of the first telescopic screed portion 2. The first telescopic screed portion 2 and the second telescopic screed portion 3 are provided with deflector plates 20, 30, deflector edges 21, 31, and base plates 22, 32, respectively. It has a mixture gate 24 supported by a support plate 23 extending from the end and opposed to the deflector plate 20, and the second telescopic screed portion 3 has a side plate 33 extending forward from its end. And a mixture gate 34 supported at an intermediate portion thereof and opposed to the deflector plate 30. Here, the lower gates of the mixture gates 24 and 34 are notched so that a gap is formed between the gates 24 and 34 and the ground.
As shown in FIG. 2, each of the telescopic screed portions 2, 3
It regulates the amount of mix A and B going to. Further, the side plate 33 restricts the movement of the mixture B in the width direction by damming there, preventing the mixture B from protruding from the intended pavement width, and improving the partitioning property of the pavement road end surface. I have. In the embodiment having the above-described structure, the members that come into contact with the mixture during the pavement work include the deflector plates 10, 20, 30, the deflector edges 11, 21, 31,
The base plates 12, 22, 32, the mixture gates 24, 34, and the side plates 33.The mixture contact portions are each formed in a hollow portion, and the burner 4 appropriately disposed in the hollow portion.
Hot air is circulated through 0,41,42. Further, discharge holes 15, 25, 35 for releasing the circulated hot air are appropriately formed in each mixture contact portion. The feature of the present embodiment is the structure in the hollow portion of the mixture contact portion excluding the base plates 12, 22, and 32 of the mixture contact portion. These structures are particularly detailed in the deflector plate 10. This will be described with reference to FIG. That is, as shown, in the hollow portion in the deflector plate 10, baffles 50 to 53 directed in the width direction have one end opened.
A plurality of open portions C are alternately arranged as C, and a blow duct 43 from the deflector edge 11 hollow portion is communicated with the open portion C opposite end of the hollow portion partitioned by the lowermost baffle plate 50. In addition, a discharge hole 15 communicating with the outside is formed at the opposite end of the open portion C in the hollow portion partitioned by the uppermost baffle plate 53. Further, a duct 44 of a burner (not shown) is communicated with the opposite end of the hollow portion of the deflector edge 11 where the blower duct 43 is attached. Therefore, the hot air from the burner in FIG. 3 first flows from the burner duct 44 to the hollow portion of the deflector edge 11, then passes through the hollow portion to the lowermost hollow portion of the deflector plate 10 from the blower duct 43, and thereafter Along the baffle plates 50 to 53, a flow path is formed which goes zigzag upward from one end of the partitioned hollow portion to the open end C, and finally passes through the discharge hole 15 at the end of the uppermost hollow portion to the outside. In other words, the above arrangement of the baffle plates 50 to 53 allows the hot air flow path to be formed to the upper, lower, left and right ends of the deflector plate 10, and the heat retention effect and the heat conduction effect of the baffle plates 50 to 53 cause the deflector plate 10 Can be efficiently and uniformly heated.
Especially when it is necessary to heat the lower part of the deflector plate 10 intensively, for example, if the baffles 50 to 53 are arranged more densely in the lower part, the heat conduction effect increases,
The desired effect can be obtained by increasing the hot air residence time. The above baffle structure of a hot air flow path formed by the plate, such as the deflector plate 31 as shown in FIG. 1, Size Lee <br/> de plate 33, baffle plate 55 also each hollow portion of the mixture material gate 34
To 57 are arranged, and a heating effect similar to that of the deflector plate 10 can be obtained in these mixture contact portions. Of course, the same applies to a case where the present invention is applied to a hollow portion of another mixture contact portion. As described above, according to the heating structure according to the present invention, the mixture contact portion of the screed portion of the asphalt finisher is efficiently heated, and the temperature decrease of the mixture is effectively prevented. can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an embodiment of the present invention, and is a view for explaining a screed portion. FIG. 2 is a schematic plan view illustrating a positional relationship between a main screed portion, a first telescopic screed portion, and a second telescopic screed portion in FIG. 1 and a contact portion with a mixture. FIG. 3 is an explanatory diagram illustrating an example of a deflector plate according to the present invention. FIG. 4 is an explanatory diagram showing a configuration of a general asphalt finisher. FIG. 5 is a schematic perspective view showing a conventional heating structure of a mixture contact portion of a screed portion. [Description of Signs] 1 Main screed part 2 First telescopic screed part 3 Second telescopic screed part 10, 20, 30 Deflector plate 11, 21, 31 Deflector edge 12, 22, 32 Base plate 50-53 Baffle plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-73707 (JP, A) JP-A 64-33867 (JP, U) JP-A 51-36221 (JP, U) Jiko Sho 62- 15287 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) E01C 19/48

Claims (1)

(57) [Claims] [Claim 1] The screed portion has a hollow contact portion with a mixture material.
Hot air is circulated through the hollow portion,
Contact of asphalt finisher to heat contact part
Part heating structure, wherein a base plate
With the exception of the components, the hot air
And heat it from below, and
Arrange the baffle so that the lower side of the inside is dense,
Arbitrary hot air flow path from the bottom to the top is formed in the hollow part
Of the asphalt finisher
Combination material contact part heating structure.