JP7121983B2 - Screed device and road paving machine using the same - Google Patents

Description

The present invention relates to a screed device for use in road paving machines such as asphalt finishers, and more particularly to a screed device characterized by a screed plate heating device.

A screed device used in a road paving machine such as an asphalt finisher is provided with a screed heating device for heating a screed plate. Conventionally, the applicant of the present application has used the following three methods for heating the screed plate in the screed heating device.

The first is a system called a duct system. FIG. 11 is a sectional view of a conventional duct-type screed heating device. In the duct system, a screed plate 93 is heated by a burner 92 attached to the inlet 91 of a duct 90 located entirely within the screed apparatus to heat the entire air within the duct 90 .

The second is a method called a blower method. FIG. 12 is a sectional view of a conventional screed heating device of blower type. In the blower method, the screed plate 93 is heated by blowing air from the blower 94 from behind the burner 95 so that the air heated by the flame of the burner 95 spreads throughout the duct 96 .

The third is a method called a dedicated blower burner method. FIG. 13 is a sectional view of a conventional screed heating device of a dedicated blower burner system. In the dedicated blower burner system, a burner 99 with a dedicated blower is used, in which a blower 97 and a burner 98 are integrated. The entire screed plate 93 is heated.

The screed heating device shown in FIGS. 11 to 13 is employed in the applicant's product, but other structures are disclosed in US Pat.

Patent Literatures 1 and 2 disclose devices that use burners to heat the screed plate directly from above the screed plate.

Patent Literature 3 discloses a device for heating a screed plate with a burner provided at an end portion of the screed plate.

Patent Document 4 discloses an apparatus in which a combustion device and a blower are provided, and hot air from the combustion device is sent to a screed plate by blowing air from the blower to heat the screed plate.

Patent Literature 5 discloses a device for heating a screed plate by blowing air into a burner box with a blower and blowing out combustion gas through a blowout hole through a duct.

Patent Document 6 discloses an apparatus in which a burner body is attached to a screed, a secondary air inlet blower is provided in the burner body, and a screed plate is heated.

Patent Literature 7 discloses a device that heats a screed plate using a blower that blows air into the screed device and a burner that is provided downstream of the blower.

Patent Literature 8 discloses a device comprising a burner, a blower for sending air heated by the burner, and a duct for blowing the hot air sent by the blower to the screed plate from an opening hole.

JP-A-8-85915 Japanese Patent Publication No. 60-16525 JP-A-10-147909 JP 2010-242359 A JP-A-7-300813 Japanese Utility Model Laid-Open No. 7-31910 JP 2006-249899 A JP 2009-127397 A

Problems with the screed heating apparatus shown in FIGS. 11 to 13 will be described below.
(1) Heating unevenness In the case of a duct-type screed heating device, there is a difference in heating time between directly under the burner and far away. If the heating time is lengthened in order to sufficiently heat the distant area or to compensate for the temperature drop due to the heat radiation in the distant area to prevent uneven heating, only the area immediately below the burner may be overheated.
In this regard, in the case of a screed heating device using a blower method or a dedicated blower burner method, the heat can be distributed throughout the duct by blowing air from the blower. Heating unevenness can be reduced.

(2) Heating efficiency In the case of a duct type screed heating device, it is necessary to increase the heating time depending on the environment such as the outside temperature. may be lost.
In the case of a screed heating device using a blower method or a dedicated blower burner method, the temperature of the flame is lowered by mixing air into the flame, which increases the amount of heat to be discarded. Therefore, conventionally, the nozzle diameter of the burner is increased to increase the amount of heat from the burner so that the heating time does not become long. As a result, gas consumption increased.

(3) Heating of upper frame In the case of a duct-type screed heating device, the flame is emitted downward, but immediately after the flame is emitted, the upper surface is heated under the same conditions as the lower surface. The temperature of the upper surface of the frame rises due to the influence of the heating, and the temperature inside the apparatus also rises.
In the case of a screed heating device using a blower method, in the structure shown in FIG. 12, the direction of flame injection from the burner and the direction of air blowing from the blower are horizontal, so the lower surface should be heated as much as possible. However, heating of the upper surface cannot be avoided.
In the case of a screed heating device using a dedicated blower burner system, in the structure shown in Fig. 13, the flame is emitted downward after air is mixed, so the upper surface and the lower surface are heated under the same conditions after the flame branching. It will happen. The temperature of the upper surface of the frame rises due to the influence of the heating, and the temperature inside the apparatus also rises.
In both methods, heat insulating material is provided to prevent temperature rise on the upper surface of the frame. Heat is lost when the moisture inside the material evaporates, which affects the heating efficiency of the screed plate.

(4) Space In the case of a duct-type screed heating device, a structure for protecting the upper frame is required in order to suppress the influence of heating on the upper frame.
In the case of a screed heating device using a blower system or a dedicated blower burner system, a storage space is required for the blower, burner, and air supply hose.
(5) Cost In the case of a duct-type screed heating device, if it is used in such a way that excessive heating occurs, peripheral parts must be replaced, resulting in high running costs.
In the case of a screed heating device using a dedicated blower burner system, a burner with a dedicated blower is expensive.

As described above, the conventional screed heating apparatus has problems in terms of uneven heating, heating efficiency, heating of the upper frame, space, and cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a screed device capable of reducing uneven heating. Another object of the present invention is to provide a screed device capable of increasing the heating efficiency. Another object of the present invention is to provide a screed device capable of suppressing heating of the upper frame as much as possible. Another object of the present invention is to provide a screed heating apparatus that can save space. Another object of the present invention is to provide a screed heating device that is advantageous in terms of cost.

In order to solve the above problems, the present invention has the following features. The present invention is a screed device for a road paving machine, comprising a screed plate for spreading asphalt mixture evenly, and a screed heating device provided above the screed plate for heating the screed plate. .

The screed heating device includes a burner and a separate burner, and includes an air supply source for supplying air and a duct for spreading the heated air heated by the burner over the entire screed plate. including the part.

The duct portion is provided below the outer duct housing and the inside of the outer duct housing, and includes a heating layer for spreading the heated air heated by the burner over the entire screed plate, and the outer duct housing. and an air supply layer provided above the heating layer and separate from the heating layer and supplying air from an air supply source to the heating layer.
The outer duct housing has an air outlet for supplying the air supplied from the air supply source to the air supply layer, and a burner for mounting the burner at a position such that the heated air from the burner can be sent to the heating layer. and a mounting portion.
The burner and the air supply source are provided separately by providing the blower port and the burner mounting portion at separate positions in the outer housing.

The member for partitioning the heating layer and the air supply layer is provided with one or more gaps so that air can be supplied from the air supply layer to the heating layer.

One of the one or more gaps is a gap for supplying air to the exit portion of the flame from the burner.

The gap is formed to supply air along the direction of flame ejection.

One of the one or more gaps is provided in the central portion when the screed plate is viewed from the vehicle width direction.

The central portion is a middle divided area when the screed plate is divided into five in the vehicle width direction.

The duct part has a partition that divides the heating layer into upper and lower parts. The partition has a gap in the central portion to allow heated air to flow from the upper layer to the lower layer of the heating layer.

One of the one or more gaps is provided at the end portion opposite the burner.

The end portion is a divided area on the opposite side of the burner when the screed plate is divided into five in the vehicle width direction.

Air is supplied in a direction opposite to the jetting direction of the flame of the burner from the gap provided in the end portion.

The duct part has a partition that divides the heating layer into upper and lower parts. The partitions have gaps at the end portions to allow heated air to flow from the upper layer to the lower layer of the heating layer.

The duct part has a partition that divides the heating layer into upper and lower parts. The partitions have gaps to allow heated air to flow from the upper layer to the lower layer of the heating layer.

The screed heating device includes a chimney section for discharging heated air from the lower layer upwards.

The duct section constitutes a heating layer and an air supply layer with a partition plate attached inside the housing.

The partition plate is inclined obliquely downward on the side opposite to the burner.

The duct section has a vent at the bottom of the burner

The screed device of the present invention is used for main or sub screeds.

The invention is a road paver equipped with a screed device according to the invention.

In the present invention, the duct section is divided into a heating layer and an air supply layer, and air is supplied from the air supply layer to the burner. Since the air supply layer is provided above the heating layer, air can be uniformly supplied to the heating layer, and the flame can be guided far away from the burner. Therefore, uneven heating of the screed plate can be suppressed.

Further, by providing the air supply layer above the heating layer, the amount of air used can be reduced as much as possible. As a result, the amount of heat that is wasted can be reduced as much as possible, and the heating efficiency of the screed plate can be enhanced.

Further, by providing an air supply layer above the heating layer and continuously supplying air from the air supply source to the air supply layer, the air in the air supply layer is replaced. Therefore, the upper layer can be kept at a low temperature, and heating of the upper frame can be suppressed as much as possible. Therefore, since it is not necessary to use a heat insulating material, it is possible to suppress a decrease in the heating efficiency of the screed plate due to moisture or the like as much as possible.

In the present invention, an air supply source is included, and the air supply source for discharging the required amount of air to the air supply layer may be a small blower, compressor, fan, or the like. Also, one air supply source can supply air to a plurality of air supply layers. For example, one air supply can supply two main screeds, left and right, and two secondary screeds, left and right. Therefore, as a result, space saving can be achieved.

Although the present invention requires an air supply source, the cost can be reduced because the air supply source can also be used as described above. Further, in the present invention, since the heating efficiency is improved, the gas usage fee can be suppressed, and as a result, the cost can be reduced. Furthermore, since uneven heating can prevent overheating, the life of peripheral parts is lengthened, and as a result, cost can be reduced. Thus, the present invention is also advantageous in terms of cost.

By providing one or more gaps in the member for partitioning the heating layer and the air supply layer so that air can be supplied from the air supply layer to the heating layer, the heating layer is evenly filled with air. can be supplied, the heated air can be spread over the entire screed plate, and uneven heating can be prevented and heating efficiency can be improved.

For example, if a gap for supplying air is provided at the outlet of the flame from the burner, uneven heating in the vicinity of the outlet of the burner can be prevented. If air is supplied from the gap near the exit of the burner along the direction of the flame ejection, the flame can be guided away from the burner, preventing uneven heating and spreading the heat over the entire screed plate. It is possible to increase the heating efficiency.

Also, by providing a vent in the lower portion of the burner, overheating directly below the burner can be prevented.

In addition, for example, by providing a gap in the central portion of the screed plate when viewed from the vehicle width direction, air can be uniformly supplied to the heating layer, so uneven heating can be prevented and heating efficiency can be improved. be able to.

If the width of the screed is large, as in the case of the sub-screed, the entire screed plate can be uniformly heated by providing a gap in the central portion.

A partition in the duct part divides the heating layer into upper and lower parts, and by providing a gap in the central part of the partition, the flame from the burner does not directly hit the screed plate, but the heated air in the lower layer spreads to the screed plate. can be heated. As a result, it becomes possible to prevent uneven heating, and to improve the heating efficiency.

For example, by providing a gap at the end portion on the opposite side of the burner, it is possible to supply air to the end portion as well, thereby preventing uneven heating and increasing the heating efficiency. At this time, if the air from the end portion is supplied in a direction opposite to the jetting direction of the flame, it is possible to further prevent uneven heating and improve the heating efficiency.

In the case of narrow screeds, such as the main screed, it is useful to heat the entire screed plate with gaps at the edge portions.

Even if there is a gap in the end portion, by dividing the heating layer into upper and lower portions and providing a gap in the end portion of the partition for that purpose, it is possible to send heated air to the layer below the heating layer, so it is possible to directly use the burner. Compared to heating the screed plate, the heated air can heat the entire screed plate evenly, improving the heating efficiency.

By inclining the side opposite to the burner of the partition plate obliquely downward, it is possible to sufficiently spread the heated air over a long distance.

These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description when read in conjunction with the accompanying drawings.

FIG. 1 is a perspective view of a screed device 1 in one embodiment of the invention. FIG. 2 is an exploded perspective view of the screed device 1 in one embodiment of the present invention. 3 is a perspective view of the screed heating device 3 mounted on the screed plate 2. FIG. FIG. 4 is a cross-sectional view of the screed heating device 3 taken along plane AA of FIG. FIG. 5 is a cross-sectional view of the screed heating device 3 taken along line BB of FIG. FIG. 6 is a sectional view of the screed heating device 3 showing a modification of the air supply layer and the heating layer. FIG. 7 is a perspective view of a screed device 100 in another embodiment of the invention. FIG. 8 is a cross-sectional perspective view of the screed device 100 taken along plane CC of FIG. FIG. 9 is an enlarged perspective view of the screed device 100 when the outer duct housing 106 and the inner duct housing 110 are shown transparently. FIG. 9 is an enlarged perspective view of the right half of the screed device 100 of FIG. FIG. 10 is a cross-sectional view of the screed device 100 taken along line CC of FIG. 7, showing a cross-section of the screed heating device 103 on the right side of the paper. FIG. 11 is a sectional view of a conventional duct-type screed heating device. FIG. 12 is a sectional view of a conventional screed heating device of blower type. FIG. 13 is a sectional view of a conventional screed heating device of a dedicated blower burner system.

A screed device 1 according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG. A road paving machine such as an asphalt finisher equipped with a screed device is often provided with a main screed and a sub screed, and if the sub screed is configured to move left and right with respect to the traveling direction of the vehicle. There are many. A pair of left and right secondary screeds may also be referred to as a telescopic screed.

The screed device 1 shown in FIGS. 1 to 5 shows the construction used for the secondary screed. However, the structure according to the invention is not only used for the secondary screed, but may also be used for the main screed. When the structure shown in FIGS. 1 to 5 is used for the main screed, the structure may be provided over the entire main screed, or two structures may be provided on the left and right sides, and there is no particular limitation.

Other embodiments of the main screed will be described later with reference to FIGS. 7 to 10. FIG.

In any case, the structure according to the present invention may be used for the main screed or the sub screed, and can be used for general screed devices regardless of the name of the main and sub screeds.

As shown in FIGS. 1 to 3 , the screed device 1 includes a screed plate 2 , a screed heating device 3 , an outer side plate 4 , an inner side plate 5 , and a telescopic guide mounting portion 9 . A mechanism (not shown) for laterally moving the screed device 1 is attached to the telescopic guide attachment portion 9 .

The screed plate 2 includes a plurality of columnar fastening portions 2a standing vertically in the front-rear direction, a reinforcing plate 2b, and an L-shaped reinforcing plate 2c.

The screed heating device 3 includes a duct outer housing 6, a first burner mounting portion 7, a vibrator fixing portion 8, a duct inner housing 10, a first duct partition plate 11, and a second duct partition plate. 12 , a flame diverter plate 13 , a first flame lower plate 14 , a second flame lower plate 15 and a burner outlet 16 . The screed heating device 3 further comprises a burner 17 and a blower 18, as shown in FIG. In FIG. 4, the flow of air from the blower 18 is indicated by dashed line arrows, and the flow of heated air from the burner 17 is indicated by dashed line arrows. In the following embodiments, a blower is used as a representative device for sending air, but a compressor, fan, or the like can be used instead of the blower. That is, in the present invention, an air supply source (for example, a blower, a compressor, a fan, etc.) for supplying air to the later-described air supply layer may be provided separately from the burner.

A first duct partition plate 11, a second duct partition plate 12, and a burner outlet 16 are attached to the inside of the duct inner housing 10 by welding or the like. As a result, as shown in FIGS. 4 and 5, a space W1 is formed between the upper surface of the duct inner housing 10 and the first duct partition plate 11, and a space W1 is formed between the upper surface of the duct inner housing 10 and the second duct partition plate. A space W<b>2 is formed between the duct partition plate 12 .

The first duct partition plate 11 is fixed inside the duct inner housing 10 so as to incline downward to the left side (toward the outer side plate 4 ) in FIG. 4 . Therefore, the space W1 is a space whose height increases toward the left side (toward the outer side plate 4) in FIG.

The second duct partition plate 12 is fixed inside the duct inner housing 10 so as to be parallel to the upper surface of the duct inner housing 4 in FIG. Therefore, the space W2 is a space with a substantially uniform height.

As shown in FIG. 4, there is a gap S1 between the right end of the first duct partition plate 11 and the left end of the second duct partition plate 12, and the air from the blower 18 flows through the gap S1 as well. It flows below the first and second duct partition plates 11 and 12 .

The air flowing from the gap S1 flows in a direction along the flow of the heated air from the burner 17. - 特許庁The gap S1 allows the air to spread downward and guides the flame to spread far away.

Similarly, there is a gap S2 between the right end of the second duct partition plate 12 and the left end of the burner outlet 16, and the air from the blower 18 flows through the gap S2 below the second duct partition plate 12. flow into.

The air flowing from the gap S2 flows in a direction along the direction in which the flame of the burner 17 is ejected. The gap S1 not only allows air to be sent to the burner 17 side, but also guides the flame to spread over a long distance.

Within the duct inner housing 10 and below the first and second duct partition plates 11 and 12, a flame branching portion 13, a first flame lower plate 14, and a second flame lower plate 15 are provided. are attached by welding or the like. A second flame bottom plate 15 is attached to the underside of the first flame bottom plate 14 .

The flame branching portion 13 is bent in the middle so as to branch the flame to the left and right in FIG. A flame from the burner 17 is branched into left and right sides in FIG. In addition, by bending the flame branching portion 13, it is possible to prevent the portion immediately below the burner 17 from being overheated.

A space W3 is formed between the first lower flame plate 14 and the first and second duct partition plates 11,12. The first lower flame plate 14 has a bent portion 14c bent downward on the left side in FIG. The first lower flame plate 14 has a gap 14a up to the bent portion. The first flame lower plate 14 has a hole 14b on the right side in FIG. A flame branch 13 is attached to the hole 14b.

A space W4 is formed between the screed plate 2 and the first flame lower plate 14 by the bent portion 14c and the gap 14a as a path for air heated by the flame.

Since the first lower flame plate 14 is not provided up to the left end of the screed plate 2 , a space W5 is formed between the screed plate 2 and the first duct partition plate 11 .

The upper surface of the duct inner housing 10 is fixed to the upper surface of the duct outer housing 6 with bolts or the like so that the holes 10c of the duct inner housing 10 and the holes 6d of the duct outer housing 6 are aligned. be. At that time, as shown in FIG. 4, the duct inner casing 10 and the duct outer casing 6 are fixed so that the blower ports 6a and 10a communicate with each other.

The duct outer casing 6 has a plurality of holes 6c. Each fastening portion 2a is passed through each hole 6c, and the duct outer housing 6 is fixed to the screed plate 2 by nuts, welding, or the like.

The outer height of the duct inner housing 10 is configured to be lower than the inner height of the outer duct housing 6 . Therefore, a space W6 is formed between the screed plate 2 and the second flame lower plate 15 attached to the duct inner housing 10 as a path for the heated air.

As shown in FIG. 4, a burner 17 is fixed to the burner fixing portion 7, the burner hole 10b, and the burner outlet 16 with bolts and nuts. The vent 6b is provided near the mounting position of the burner 17 of the duct outer housing 6. As shown in FIG. The air necessary for burning the gas in the burner 17 is also supplied from the vent 6b. Here, the vent 6b is formed by a punched hole so as to facilitate maintenance when the asphalt mixture is clogged, but the shape is not limited in the present invention. Since air is supplied directly below the burner 17 by the vent 6b, overheating directly below the burner 17 can be prevented.

A blower mounting bracket 18b is fixed to the air outlet 6a of the duct outer housing 6 by bolts, welding, or the like. The blower 18 is connected via a hose 18a to a blower fitting 18b. The blower 18 is fixed in place on the road paver.

Based on the above structure, how the screed plate 2 is heated will be described.

First, the flow of air supplied from the blower 18 will be described. Air from the blower 18 is sent to the space W2 through the hose 18a and the blower fixture 18b. The air reaching the space W2 is divided into left and right. The air separated to the right side is supplied to the outlet portion on the burner 17 side through the gap S2 and mixed with the combustion gas from the burner 17 . Since the air supplied from the gap S2 is supplied along the direction in which the flame is ejected, the gas from the burner 17 is efficiently combusted and the flame is efficiently directed to the left side in the drawing. can be induced.

On the other hand, the air divided to the left side in the space W2 is sent to the space W1 and is also supplied to the space W3 side from the gap S1 to generate a flow that sends the heated air existing in the space W3 to the left side. When the combustion gas reaches the vicinity of the gap S1, the combustion gas and the air from the gap S1 are mixed and used for combustion.

The gap S1 is provided in the central portion when the screed plate 2 is viewed from the vehicle width direction (horizontal direction of the paper surface of FIG. 4). Here, the central portion does not have to be completely central, but refers to a region having a constant width, such as the central divided region when the screed plate 2 is divided into five in the vehicle width direction. By providing the gap S1 in the central portion, the air from the blower 18 can be efficiently supplied to the flame side. The space W1 is continuously supplied with air from the blower 18, and uniform heating with little heating unevenness can be achieved.

Next, the flow of flame and heated air from the burner 17 will be described. The flame injected from the burner 17 is branched left and right by the flame branch plate 13 . Since the vent 6b is provided below the burner 17, air is supplied directly below the burner 17, so that temperature rise directly below the burner 17 can be suppressed. The right end side of the screed plate 2 is heated by the flame flowing rightward from the burner 17 .

Air is supplied from the gap S2 between the second partition plate 12 and the burner fixing portion 16 by the blower 18 . This air is used for combustion of gas ejected from the burner 17 . As a result, the flame split to the left from the burner 17 spreads through the space W3 and heats the screed plate 2 between the holes 14a and 14b.

The flame and heated air that have passed through space W3 spread to spaces W4 and W6 through gap 14a. Thereby, the screed plate 2 between the right end of the screed plate 2 and the bent portion 14c is heated.

When the gas jetted from the burner 17 reaches the vicinity of the hole 14a, it is further combusted by the air supplied from the blower 18 through the gap S1. Then, the heated air is sent to the space W5 on the left side of the screed plate 2 according to the air flow from the gap S1. Since the first duct partition plate 11 is inclined, the height of the space W5 becomes lower toward the left side, and the left side of the screed plate 2 is efficiently heated.

Since the air existing in the space W1 and the space W2 is constantly replaced by the blower 18, the temperature rise in the upper part of the screed heating device 3 is suppressed.

Based on the above effects, the features of this embodiment will be organized.

In the screed heating device 3, the outer duct housing 6, the inner duct housing 10, and the first duct partition plate 11, the second duct partition plate 12, the first flame lower plate 14, which are internal partitions, and The duct portion formed by the second flame lower plate 15 is arranged to spread the air heated by the burners 17 over the entire screed plate 2 .

The duct section is provided on a heating layer for spreading the heated air heated by the burners 17 over the entire screed plate 2, and on the heating layer, for supplying air from the blower 18 to the heating layer. It is divided into an air supply layer. The heating layer and the air supply layer are separate cavities separated by first and second duct partition plates 11,12. In this embodiment, the air supply layers are spaces W1 and W2. The heating layers are spaces W3, W4, W5 and W6.

The heating layer is vertically divided by first and second flame lower plates 14, 15, which are partitions. The heating layers are spaces W3 and W5, which are upper layers provided between the first and second flame lower plates 14, 15 and the first and second duct partition plates 11, 12, and the second It is divided into spaces W4 and W6 which are lower layers provided between the first and second flame lower plates 14, 15 and the screed plate 2. FIG.

However, the spaces W4 and W6, which are the lower layers, are not essential, and the space between the first and second flame bottom plates 14, 15 and the screed plate 2 may be absent. In this case, the structure may be such that the first and second flame lower plates 14 and 15 are not provided.

From the air supply layer, gaps S1 and S2 are provided through which air from the blower 18 is supplied to the heating layer. In this embodiment, the gap S1 is provided by separating the first and second duct partition plates 11 and 12, and the gap S2 is provided by separating the second duct partition plate 12 and the burner outlet 16. and The arrangement, number, size, etc. of the gaps may be appropriately determined in consideration of the circulation of heated air in the heating layer and the combustion efficiency. One or more gaps are provided, and the present invention is not limited.

The gaps S1 and S2 shown in the present embodiment merely show an example of the structure. As long as fresh air is supplied from the air supply layer to the heating layer, a structure other than the structure shown in this embodiment may be used.

For example, the first and second duct partition plates 11 and 12 may be made into one member, and holes for supplying air to the heating layer may be used as gaps.

Thus, the one or more gaps are not limited to gaps between plates, but may be holes, and the structure, shape, and the like do not limit the present invention.

Also, the burner outlet 16 is not an essential component and may not be provided.

That is, any structure may be used as long as an appropriate amount of fresh air from the air supply layer is supplied to the burner 17 side. A hole may be appropriately provided in the part.

Based on such a modification, FIG. 6 shows a modification of the screed heating device 3 having a simplified structure. In FIG. 6, a single member is used as the duct partition plate 21, and the duct partition plate 21 is fixed to the duct inner casing 10 by welding or the like. Also, in the screed heating device 3 shown in FIG. 6, the first and second flame lower plates 14, 15 are omitted. A hole 21a is provided in the central portion of the duct partition plate 21 (the middle divided region when the screed plate is divided into five), and a hole 21b is provided in the right end portion.

In the screed heating device 3 shown in FIG. 6, the spaces W1 and W2 between the duct inner housing 10 and the duct partition plate 21 function as air supply layers. Spaces W3 and W5 between the duct partition plate 21 and the screed plate 2 function as heating layers. Through the holes 21b air is supplied to the burners 17 and through the holes 21a air is supplied for circulation of the heated air in the heating bed. The arrangement, number, size, and the like of the holes are not particularly limited, and may be determined as appropriate in consideration of the circulation of heated air in the heating layer, the combustion efficiency, etc., which limits the present invention. not a thing

Typically, in a road paver there are two secondary screeds left and right and one primary screed in the middle. When the structure of the present invention is adopted for all screed devices, each screed device may be provided with a blower 18, but the blower 18 is made common to branch the air and supply air to the air supply layer of each screed. It is preferable to supply air from one blower.

7 to 10, an embodiment of the screed device 100 for the main screed will now be described. It should be noted that, as mentioned at the outset, the structures shown in FIGS. 7 to 10 may also be used for secondary screeds. 7 to 10, parts having the same functions as those of the screed device 1 are denoted by the same member names, but different reference numerals are used for distinction. However, since parts having the same member name have the same function, detailed description of the function and structure will be omitted as appropriate.

As shown in FIGS. 7-10, the screed device 100 comprises screed plates 102, 102, screed heating devices 103, 103, and outer side plates 104, 104. As shown in FIGS. The screed heating devices 103 , 103 have a symmetrical structure with respect to the lateral center of the screed device 100 . It should be noted that only one screed heating device 103 may be provided over the entire width of the main screed. The two screed heating devices 103 may be combined into one screed heating device 103 .

The screed heating device 103 includes a duct outer casing 106, a burner fixing portion 107, a vibrator fixing portion 108, an inner duct casing 110, a first duct partition plate 111, a second duct partition plate 112, It includes a burner bottom plate 113 , a first flame bottom plate 114 , a second flame bottom plate 115 , a burner outlet fitting 116 , a blower fitting 18 b and a chimney section 130 .

In FIG. 10 , the flow of air from a blower (not shown) is indicated by white broken line arrows, the flow of heated air from burner 17 is indicated by white solid line arrows, and the flow of heated air heated by flames and sent by the blow is indicated by white arrows. Indicated by bold arrows.

As shown in FIGS. 8 to 10, a first duct partition plate 111, a second duct partition plate 112, and a burner outlet 116 are fixed inside the duct inner housing 110 by welding or the like. . Thereby, as shown in FIG. 10, a space W12 is formed between the upper surface of the duct inner housing 110 and the second duct partition plate 112. As shown in FIG. The second duct partition plate 112 is fixed inside the duct inner housing 110 so as to be parallel to the upper surface of the duct inner housing 104 in the lower part of the blower. Therefore, the space W12 is a space with a substantially uniform height.

The second duct partition plate 112 is bent downward near the center of the screed plate 102, and the first duct partition plate 111 having a U-shaped cross section is provided at the tip of the bend. Thus, a space W11 is formed between the first duct partition plate 111, the second duct partition plate 112, and the upper surface of the duct inner housing 104. As shown in FIG.

As shown in FIG. 10 , a gap S11 is provided between the first duct partition plate 111 and the tip of the bent portion of the second duct partition plate 112 . The gap S11 is provided at a position away from the burner. Air is sent out from the gap S11. Although the air from the gap S11 flows below the first lower flame plate 114 here, it may flow above the first lower flame plate 114. FIG.

The gap S<b>11 is provided at the end opposite to the burner 17 . The term "end portion" as used herein refers to a region representing a certain range, such as a divided region on the side opposite to the burner 17 when the screed plate 102 is divided into five in the vehicle width direction. The air from the blower 18 is reflected by the first partition plate 111 on the end face opposite to the burner 17, so that the air flows from the gap S11 in the direction opposite to the direction of the flame of the burner 17 in the heating layer. supplied to

A gap S<b>12 is also provided between the burner outlet tool 116 and the other end of the second duct partition plate 112 . The gap S12 is provided near the burner. Ventilation is sent out from the gap S12 along the jetting direction of the burner.

The burner directly below plate 113 is arranged diagonally downward directly below the burner 17 . Thereby, the flame from the burner 17 is sent obliquely downward. The first flame bottom plate 114 is arranged below the second duct partition plate 112 . Thus, a space W13 is formed between the first flame lower plate 114 and the second duct partition plate 112. As shown in FIG. The flame flows over the first lower flame plate 114 mounted on the second lower flame plate 115, but at that time, the flame joins with the air from the gap S12 to increase the heating power. .

A space W14 is formed between the first lower flame plate 114 and the second lower flame plate 115 and the screed plate.

As indicated by the thick white arrow in FIG. 10 , the flame and air join together, and the heated air passes through the space W13 and reaches the tip of the first flame lower plate 114 . As shown in FIG. 9, the end of the first flame lower plate 114 on the side opposite to the burner is partly cut away to form a gap S13.

Therefore, as indicated by the thick white arrow in FIG. 10, the air blown from the gap S11 and the heated air from the gap S13 merge, and the heated air is sent out below the first lower flame plate 114. FIG. Then, the screed plate 102 is heated by the heated air that has passed through the space W14 under the first lower flame plate 114 and the second lower flame plate 115 . After that, the heated air is discharged from the hole 130a of the chimney 130. As shown in FIG.

In the above embodiment, the air supply layers are spaces W11 and W12. The heating layers are spaces W13 and W14. The heating layer consists of a space W13 which is an upper layer provided between the second duct partition plate 112 and the first lower flame plate 114, and the first and second lower flame plates 114 and 115. and the space W14 which is the lower layer provided between the screed plate 102 and the space W14.

In general, the main screed is smaller in width but larger in depth and height than the telescoping screed. In the case of such dimensional conditions, it is preferable to provide a gap for introducing air from the air supply layer immediately after the flame discharge portion of the burner (gap S12) and at the end of the duct of the air supply layer (gap S11). At the end of the duct, the air is guided downward by the tip of the second duct partition plate 112 and then guided in the opposite direction by using the first duct partition plate 111 . As a result, the heated air is guided to the upper portion of the screed plate 102, and the heating efficiency of the screed plate can be improved.

Note that the chimney section 130 may be provided in the embodiments shown in FIGS. That is, the layer below the heating layer is preferably connected to the chimney section 130 and exhausted from the chimney section 130 .

Although the present invention has been described in detail, the foregoing description is merely illustrative of the invention in all respects and is not intended to limit its scope. It goes without saying that various modifications and variations can be made without departing from the scope of the invention. Constituent elements of the invention disclosed in this specification shall be established independently as independent inventions. Inventions in which each constituent element is combined in any combination method are also included in the present invention.

INDUSTRIAL APPLICATION This invention is a screed apparatus and a road paving machine using the same, and can be utilized industrially.

Reference Signs List 1,100 screed device 2,102 screed plate 2a fastening portion 2b reinforcing plate 2c L-shaped reinforcing plate 3,103 screed heating device 4,104 outer side plate 5 inner side plate 6,106 duct outer casing 6a blower port 6b vent 6c hole 6d hole 7 first burner mounting part 107 burner fixing part 8, 108 vibrator fixing part 9 extensible guide mounting part 10, 110 housing in duct 10a air outlet 10b hole for burner 10c hole 11, 111 first duct partition Plates 12, 112 Second duct partition plate 13 Flame branch plate 113 Burner directly below plate 14, 114 First flame lower plate 14a Gap (central portion)
14b hole 14c bend 15, 115 second flame lower plate 16, 116 burner outlet 17 burner 18 blower (air supply)
18a Duct hose 18b Blower fixture 130 Chimney 130a Hole W1 Space (air supply layer)
W2 space (air supply layer)
W3 space (heating layer)
W4 space (heating layer)
W5 space (heating layer)
W5 space (heating layer)
W11 space (air supply layer)
W12 space (air supply layer)
W13 space (heating layer)
W14 space (heating layer)
S1 gap (exit part of flame from burner)
S2 Gap (central part)
S11 Gap (end portion)
S12 gap (exit part of flame from burner)
S13 Gap (end portion)

Claims (20)

A screed device in a road paving machine, comprising:
A screed plate for spreading the asphalt mixture,
A screed heating device provided above the screed plate for heating the screed plate,
The screed heating device is
a burner;
The burner is provided separately, an air supply source for supplying air,
a duct portion for spreading the heated air heated by the burner over the entire screed plate;
The duct section
a housing outside the duct;
a heating layer provided below the interior of the duct outer housing for spreading the heated air heated by the burner over the entire screed plate;
A separate cavity provided inside the duct outer housing and above the heating layer and separated from the heating layer, and supplying air from the air supply source to the heating layer and an air supply layer to
The outer housing of the duct,
an air outlet for supplying the air supplied from the air supply source to the air supply layer;
a burner mount for mounting the burner in a position such that the heated air from the burner can be directed to the heating layer;
The screed device , wherein the burner and the air supply source are separately provided by providing the blower port and the burner mounting portion at separate positions in the outer housing . The member for partitioning the heating layer and the air supply layer is provided with one or more gaps so that air can be supplied from the air supply layer to the heating layer. A screed device according to claim 1, characterized in that 3. A screed device according to claim 2, wherein one of said one or more gaps is a gap for supplying air to a flame exit portion from said burner. 4. The screed device according to claim 3, wherein said gap is formed so as to supply air along the direction of flame ejection. The screed device according to any one of claims 2 to 4, wherein one of said one or more gaps is provided in a central portion of said screed plate when viewed from the vehicle width direction. 6. The screed device according to claim 5, wherein the central portion is a middle divided area when the screed plate is divided into five in the vehicle width direction. 6. The screed device according to claim 5, wherein said screed heating device is used in a laterally movable auxiliary screed device. The duct part has a partition that divides the heating layer into upper and lower parts,
6. A screed device according to claim 5, characterized in that said partition has a gap in said central portion to allow said heating air to flow from an upper layer to a lower layer of said heating layer. . A screed device according to any one of claims 2 to 4, characterized in that one of said one or more gaps is provided at the end portion opposite said burner. 10. The screed device according to claim 9, wherein said end portion is a divided region on the opposite side of said burner when said screed plate is divided into five in the vehicle width direction. 10. The screed device according to claim 9, wherein air is supplied in a direction opposite to a direction in which the flame of the burner is jetted out from the gap provided in the end portion. The duct part has a partition that divides the heating layer into upper and lower parts,
10. Screed device according to claim 9, characterized in that the partition has a gap at the end portion to allow the heating air to flow from the upper layer to the lower layer of the heating layer. . 10. Screed device according to claim 9, characterized in that the screed heating device is used in the main screed device. 14. The screed device according to claim 13, wherein the screed heating devices are provided on the left and right sides of the main screed device. The duct part has a partition that divides the heating layer into upper and lower parts,
2. A screed device according to claim 1, characterized in that the partition has gaps to allow the heating air to flow from the upper layer to the lower layer of the heating layer. A screed device according to claim 8, 12 or 15, characterized in that said screed heating device comprises a chimney for discharging said heated air from said lower layer upwards. 2. The screed device according to claim 1, wherein said duct portion constitutes said heating layer and said air supply layer by means of a partition plate attached inside a housing. 18. The screed device according to claim 17, wherein the partition plate is inclined obliquely downward on the side opposite to the burner. A screed device according to claim 1, characterized in that said duct section has a vent below said burner. A road paving machine comprising a screed device according to any one of claims 1-19.

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