JP7025313B2 - Asphalt mixture stirrer and asphalt finisher - Google Patents

Description

The present invention relates to an asphalt mixture agitator and an asphalt finisher.

The asphalt finisher receives an asphalt mixture (also called asphalt mixture) such as a heated asphalt mixture input from a carrier such as a dump truck by a front hopper, and transports it to a rear screw spreader by a bar feeder on the bottom of the hopper. It is spread on the surface to be constructed on the road (for example, the surface of the base layer or the surface of the roadbed) by a screw spreader and spread by a screed.

The screed consists of a center screed and a pair of side screeds. The center screed is provided in the center of the rear of the asphalt finisher. The pair of side screeds are provided on the left and right sides of the rear of the asphalt finisher with the center screed in between, and extend from the side surface of the vehicle body in the left-right direction. Each end of the pair of side screeds is provided with a side plate that extends forward.

In the above-mentioned asphalt finisher, the asphalt mixture spread on the surface to be constructed behind the vehicle body is spread by screed, but most of it is dammed by screed. This dammed asphalt mixture spreads to the left and right of the vehicle along the screed, but is eventually dammed by the side plates. Therefore, the asphalt mixture tends to stay in the corner portion (predetermined area of the corner) formed by the side plate and the side screed.

Here, if the amount delivered by the screw spreader is insufficient or excessively large, the coarse particles and the fine particles are likely to be separated in the asphalt mixture. When the amount of feed is small, the coarse particles tend to concentrate in the above-mentioned corners, and when the amount of feed is large, the fine particles tend to float on the surface (upper part). When this material separation occurs, the asphalt mixture becomes a defective mixture. In addition, when the asphalt mixture stays in the corners, its temperature drops with the passage of time, and especially when the outside temperature is low such as in winter, the temperature drops sharply, so the asphalt mixture staying in the corners tends to be a defective mixture. .. If the asphalt mixture becomes a defective mixture due to such material separation or temperature decrease, insufficient compaction and defective finished surface will occur, resulting in deterioration of construction quality.

Japanese Unexamined Patent Publication No. 11-124814

An object to be solved by the present invention is to provide an asphalt mixture agitator and an asphalt finisher capable of suppressing deterioration of construction quality due to material separation and temperature decrease of the asphalt mixture.

The asphalt mixture agitator according to claim 1 is formed by a screed that spreads the asphalt mixture on the surface to be constructed behind the vehicle body by an asphalt finisher spreader and a side plate that dams up the asphalt mixture that spreads along the screed. An asphalt mixture agitator that agitates the asphalt mixture in the corners of the asphalt concrete, which is located on the rear side of the spreader and on the front side of the screed, and has a blade rotation shaft that extends along the stretching direction of the screed. It is characterized by including a plurality of blades provided on the blade rotation shaft and agitating the asphalt mixture in the corner portion according to the rotation of the blade rotation shaft.

Further, the asphalt mixture agitator according to claim 2 is the asphalt mixture agitator according to claim 1, which has a support rotation shaft extending along the extension direction of the blade rotation shaft and an end portion of the support rotation shaft. It is characterized in that it is provided with a support member extending in a direction intersecting the support rotation shaft to support the blade rotation shaft.

Further, the asphalt mixture agitator according to claim 3 is a support tube that is detachably fitted to the blade rotation shaft and supports the plurality of blades in the asphalt mixture agitator according to claim 1 or 2. It is characterized by having.

Further, the asphalt mixture agitator according to claim 4 is the asphalt mixture agitator according to any one of claims 1 to 3, wherein the plurality of blades on the side plate side among the plurality of blades are. , The asphalt mixture in the corner is formed so as to be pushed forward in response to the rotation of the blade rotation shaft.

Further, the asphalt mixture agitator according to claim 5 is the asphalt mixture agitator according to any one of claims 1 to 4, wherein a plurality of the plurality of blades on the opposite side to the side plate side are used. The blade is characterized in that the asphalt mixture at the corner is pushed out toward the center of the rear of the vehicle body in response to the rotation of the blade rotation shaft.

The asphalt finisher according to claim 6 is characterized by comprising the asphalt mixture agitator according to any one of claims 1 to 5.

According to the asphalt mixture agitator or the asphalt finisher according to the present invention, it is possible to suppress the deterioration of the construction quality due to the material separation and the temperature decrease of the asphalt mixture.

It is a side view which shows the schematic structure of the asphalt finisher which concerns on 1st Embodiment. It is a top view which shows the schematic structure of the asphalt finisher which concerns on 1st Embodiment. It is a front view which shows the schematic structure of the asphalt mixture agitator which concerns on 1st Embodiment. It is a side view which shows the schematic structure of the asphalt mixture agitator which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the blade attachment / detachment mechanism of the asphalt mixture agitator which concerns on 2nd Embodiment. It is explanatory drawing for demonstrating 1st example of the blade unit which concerns on 2nd Embodiment, (A) is a front view, (B) is a side view. It is explanatory drawing for demonstrating the 2nd example of the blade unit which concerns on 2nd Embodiment, (A) is a front view, (B) is a side view. It is explanatory drawing for demonstrating the 3rd example of the blade unit which concerns on 2nd Embodiment, (A) is a front view, (B) is a side view. It is explanatory drawing for demonstrating the 4th example of the blade unit which concerns on 2nd Embodiment, (A) is a front view, (B) is a side view. It is explanatory drawing for demonstrating the 5th example of the blade unit which concerns on 2nd Embodiment, (A) is a front view, (B) is a side view. It is explanatory drawing for demonstrating the sixth example of the blade unit which concerns on 2nd Embodiment, (A) is a front view, (B) is a side view.

<First Embodiment>
The first embodiment will be described with reference to FIGS. 1 to 4.

(Basic configuration)
As shown in FIGS. 1 and 2, the asphalt finisher 10 according to the first embodiment includes a vehicle body 20, a hopper 30, a conveyor 40, a spreader 50, a screed (laying machine) 60, and a screed elevating machine. A device 70, a stirrer (asphalt mixture stirrer) 80, and a control device 90 are provided.

The vehicle body 20 has two pairs of front wheels 21 and a pair of rear wheels 22 (see FIG. 2), and is formed so as to be able to move forward and backward (move forward and backward). The two pairs of front wheels 21 are steering wheels and are provided at the lower part on the front side of the vehicle body 20. Further, the pair of rear wheels 22 are driving wheels, which are provided in the lower part on the rear side of the vehicle body 20.

Here, the traveling direction of the vehicle body 20 is the direction of the arrow A1 in FIGS. 1 and 2, and the front, rear, left, and right of the vehicle body 20 are defined based on the traveling direction A1 of the vehicle body 20 (while facing the traveling direction A1). Will be done. Further, unless otherwise specified, the front of the vehicle body 20 includes not only the front of the vehicle body 20 but also the diagonal front, and the rear of the vehicle body 20 includes not only the front of the vehicle body 20 but also the diagonal rear. I'm out.

The hopper 30 is provided on the front side of the vehicle body 20 and is configured to be openable and closable in the left-right direction of the vehicle body 20 (the direction horizontally orthogonal to the traveling direction A1 of the vehicle body 20). The hopper 30 receives an asphalt mixture (for example, a heated asphalt mixture) charged from a carrier (not shown) such as a dump truck in a fully open state. After that, the hopper 30 closes when the charged asphalt mixture is conveyed by the conveyor 40 and decreases, and the asphalt mixture existing near the inner wall of the hopper 30 is collected in the center of the hopper 30, that is, on the conveyor 40.

The conveyor 40 is a two-row bar feeder type conveyor having two rows of conveyors. The conveyor 40 is provided inside the vehicle body 20 so that its extending direction is parallel to the traveling direction A1 of the vehicle body 20 and penetrates the vehicle body 20 from front to rear. The conveyor 40 conveys the asphalt mixture charged in the hopper 30 from the front side to the rear side of the vehicle body 20 and supplies it to the spreader 50. As the conveyor 40, in addition to the two-row type bar feeder type conveyor, for example, a one-row type bar feeder type conveyor, a screw type conveyor, and other conveyors having other configurations can be used.

The spreader 50 has two screw spreaders 51 (see FIG. 2). These screw spreaders 51 are positioned so that their respective stretching directions are parallel to the left-right direction (width direction) of the vehicle body 20, and a part of them individually protrudes from the left and right side surfaces of the vehicle body 20. It is installed behind. The spreader 50 transfers the asphalt mixture supplied by the conveyor 40 to the left and right of the vehicle body 20 by two screw spreaders 51, and has a predetermined width (width equal to or larger than the width of the vehicle body 20) on the surface to be constructed behind the vehicle body 20. Spread with. As the spreader 50, a spreader having another configuration can be used in addition to the screw spreader.

The screed 60 has a center screed 61 and two side screeds 62 (see FIG. 2). The center screed 61 and the two side screed 62 are positioned rearward from the spreader 50, and are supported by the screed elevating device 70 so that the extending direction thereof is parallel to the width direction of the vehicle body 20. The screed 60 spreads the asphalt mixture spread on the surface to be constructed behind the vehicle body 20 by the spreader 50 by the center screed 61 and the two side screed 62.

The center screed 61 is provided in the center behind the vehicle body 20. The two side screeds 62 are provided on the left and right behind the vehicle body 20 with the center screed 61 in between, and extend in the left-right direction from the left and right side surfaces of the vehicle body 20. Each end of each of these side screeds 62 is provided with a side plate 63 extending forward. The side plate 63 dams the asphalt mixture that is dammed by the center screed 61 and the side screed 62 and spreads along the front surface of the side screed 62. That is, the movement of the vehicle body 20 in the left-right direction in the asphalt mixture is restricted by the left and right side plates 63.

The screed elevating device 70 includes a pair of leveling arms 71, a pair of leveling cylinders 72, and a pair of scree drift cylinders 73. The screed elevating device 70 uses a pair of leveling cylinders 72 and a pair of scree drift cylinders 73 to elevate and elevate a pair of leveling arms 71 that support the screed 60.

The leveling arm 71, the leveling cylinder 72, and the screen drift cylinder 73 are provided on the left and right sides of the vehicle body 20, respectively. The front ends of the pair of leveling arms 71 are attached to the vehicle body 20 via the leveling cylinders 72, respectively. Further, the rear end portions of the pair of leveling arms 71 are attached to the vehicle body 20 via the screen drift cylinder 73, respectively. A screed 60 is connected to the rear end of such a pair of leveling arms 71.

The stirrer 80 is individually attached to the two side plates 63 (see FIG. 2). The stirrer 80 stirs the (existing) asphalt mixture in the corner formed by the side screed 62 and the side plate 63. The corner portion is a predetermined region (predetermined region of the corner) including a corner formed by the side screed 62 and the side plate 63, and including a region where the asphalt mixture is likely to stay. The details of each stirring device 80 will be described later.

The control device 90 includes a microcomputer that centrally controls each unit and a storage unit (none of which is shown) that stores processing information, various programs, and the like. The control device 90 controls each part such as a hopper 30, a conveyor 40, a spreader 50, a screed 60, a screed elevating device 70, and a stirrer 80 via a hydraulic circuit or an electric circuit based on various information and various programs.

(Agitator)
Next, the stirring device 80 will be described with reference to FIGS. 3 and 4. Since the structures of the two left and right stirring devices 80 of the vehicle body 20 are the same, the stirring device 80 on the left side of the vehicle body 20 will be described.

As shown in FIGS. 3 and 4, the stirring device 80 includes a support base 81, a support rotation shaft 82, a support column (an example of a support member) 83, a blade rotation shaft 84, a plurality of blades 85, and a motor 86. And a shaft 87 and a gear mechanism 88. The stirring device 80 is detachably formed on the side plate 63, and is used in a state of being attached to the side plate 63.

The support base 81 is provided on the outer surface on the upper end side of the side plate 63, and supports the support rotation shaft 82 so as to be rotatable and slidable. The support base 81 is formed so that the support rotation shaft 82 can be fixed at a desired position in the rotation direction and a desired position in the left-right direction of the vehicle body 20 by a lock mechanism (not shown). Further, the support base 81 is formed so as to be slidable in the front-rear direction of the vehicle body 20, and can be fixed to a desired position in the front-rear direction of the vehicle body 20 by a fixing member (not shown) such as a bolt. There is.

The support rotation shaft 82 extends along the left-right direction of the vehicle body 20 to support the support column 83. One end of the support rotation shaft 82 is supported by the support base 81, and the other end is connected to the upper end of the support column 83. The support rotation shaft 82 is fixed and supported by the support base 81 at a desired position in the left-right direction of the vehicle body 20.

The support column 83 is attached to one end of the support rotation shaft 82, and extends in a direction orthogonal to the support rotation shaft 82 (an example of an intersecting direction). The support column 83 is rotatable (rotatable) with the support rotation shaft 82 as the center of rotation, and is tilted and fixed at a predetermined angle. At this time, the rotation of the support rotation shaft 82 is restricted by the lock mechanism of the support base 81. The support column 83 rotatably holds the blade rotation shaft 84 at the other end on the opposite side to the support rotation shaft 82 side.

The blade rotation shaft 84 is rotatably provided at the lower end portion of the support column 83 so as to penetrate the lower end portion of the support column 83 in the left-right direction of the vehicle body 20. The blade rotation shaft 84 is located on the rear side of the spreader 50 and on the front side of the screed 60 (see FIG. 2), and extends in the left-right direction of the vehicle body 20, that is, along the stretching direction of the spreader 50 and the screed 60. ing. The blade rotation shaft 84 extends until the end portion on the side opposite to the side plate 63 side is located directly behind the spreader 50.

Each blade 85 is formed in a rectangular plate shape, and the blade rotation axis is orthogonal to the extension direction of the blade rotation axis 84 in the longitudinal direction and parallel to the extension direction of the blade rotation axis 84 in the lateral direction. It is provided on the outer peripheral surface of 84. These blades 85 are arranged at predetermined intervals (see FIG. 3) in the extending direction of the blade rotation shaft 84, and are arranged so as to have a cross shape (see FIG. 4) when viewed from the side surface. Each blade 85 rotates (rotates) around the blade rotation shaft 84 in accordance with the rotation of the blade rotation shaft 84, and agitates the asphalt mixture in the corner formed by the side screed 62 and the side plate 63.

The motor 86 is provided at the upper end of the support column 83. The motor 86 is a hydraulic motor, and the torque and rotation speed of the motor 86 are adjusted by an adjusting unit (neither is shown) such as an adjusting valve attached to a hydraulic hose. This adjusting unit is controlled by the control device 90 or an operator.

The shaft 87 is rotatably provided inside the support column 83 along the extending direction of the support column 83. The upper end of the shaft 87 is connected to the motor 86 via a coupling (not shown), and the lower end thereof is connected to the gear mechanism 88 via a coupling (not shown). The shaft 87 rotates according to the drive of the motor 86.

The gear mechanism 88 is provided inside the lower end portion of the support column 83, and connects the shaft 87 and the blade rotation shaft 84. The gear mechanism 88 transmits the rotation of the shaft 87, which is the vertical axis, to the blade rotation shaft 84, which is the horizontal axis. As the gear mechanism 88, for example, a bevel gear can be used.

In such a stirring device 80, when the motor 86 is driven and the shaft 87 is rotated, this rotation is transmitted to the blade rotating shaft 84 via the gear mechanism 88, and the blade rotating shaft 84 is rotated in the rotation direction A2 (see FIG. 4). Rotate to. In response to the rotation of the blade rotation shaft 84, each blade 85 rotates around the shaft and agitates the asphalt mixture in the corner (see FIG. 2) formed by the side screed 62 and the side plate 63. Therefore, the asphalt mixture in the above-mentioned corner is mixed with the asphalt mixture (fresh asphalt mixture) in a high temperature state sequentially supplied by the spreader 50. As a result, it is possible to suppress the occurrence of material separation of the asphalt mixture in the above-mentioned corners, and further, it is possible to suppress the temperature of the asphalt mixture in the above-mentioned corners from decreasing with the passage of time. The rotation direction A2 is a rotation direction in which the asphalt mixture is pushed forward by each of the blades 85 located below the blade rotation shaft 84.

Further, the support rotation shaft 82 is formed so as to be slidable in the left-right direction of the vehicle body 20 (see FIG. 3). This makes it possible to adjust the left-right position (position in the left-right direction) of the blade rotation shaft 84 without removing the stirring device 80, so that the asphalt mixture in the above-mentioned corner is surely stirred by each blade 85. can do.

Further, the support column 83 is formed so as to rotate and swing around the support rotation shaft 82 as the rotation center (see FIG. 4). This makes it possible to adjust the height position (position in the height direction) and the front-rear position (position in the front-rear direction) of the blade rotation shaft 84 without removing the stirring device 80. Further, the support base 81 is formed so as to be slidable in the front-rear direction of the vehicle body 20. This makes it possible to adjust the front-rear position of the support rotation shaft 82, that is, the front-rear position of the blade rotation shaft 84. From these facts, it becomes possible to adjust the height position and the front-rear position of each blade 85, so that the asphalt mixture in the above-mentioned corner can be agitated more reliably.

(Laying process)
Next, the flow of the above-mentioned asphalt finisher 10 leveling step will be described.

First, as a preparation for construction, the asphalt finisher 10 is in a state where the asphalt mixture can be conveyed by driving the conveyor 40. In this state, the asphalt mixture is charged into the hopper 30 from the loading platform of the carrier located in front of the asphalt finisher 10. The charged asphalt mixture is conveyed from the front to the rear of the vehicle body 20 by a conveyor 40 in the vehicle body 20 and supplied to a spreader 50 (a pair of screw spreaders 51) located on the rear side of the vehicle body 20. Then, the asphalt mixture is spread on the surface to be constructed on the road (for example, the surface of the base layer or the surface of the roadbed) by the spreader 50.

At this time, the asphalt finisher 10 is slowly moving forward, and the asphalt mixture spread on the surface to be constructed behind the vehicle body 20 is spread by the screed 60 (center screed 61 and two side screed 62). .. The asphalt mixture is sequentially supplied to the work surface behind the vehicle body 20, that is, the work surface in front of the screed 60, and is spread and compacted by the screed 60 as the asphalt finisher 10 advances. ..

During this leveling process, the asphalt mixture spread on the surface to be constructed behind the vehicle body 20 by the spreader 50 is spread by the screed 60, but most of it is dammed by the screed 60. This dammed asphalt mixture spreads to the left and right of the vehicle body 20 along the screed 60 and is finally dammed by the side plate 63. In this situation, the asphalt mixture at the corners formed by the side screed 62 and the side plate 63 that are part of the screed 60 is agitated by each of the blades 85 that rotates in response to the rotation of the blade rotation shaft 84. Further, since the asphalt mixture in the high temperature state (fresh asphalt mixture) moves sequentially from the spreader 50 side to the corners, the asphalt mixture in the above-mentioned corners sequentially mixes with the asphalt mixture in the high temperature state. It will be. That is, at the corners formed by the side screed 62 and the side plate 63, the asphalt mixture in the upper layer and the lower layer are mixed while the asphalt mixture in the high temperature state is sequentially supplied.

Here, when the amount of feed by the screw spreader 51 is small, the coarse particles tend to concentrate in the above-mentioned corners, while when the amount of feed is large, the fine particles separate and float on the surface, and the lower part The grain size tends to be coarse. In addition, the temperature of the upper asphalt mixture tends to decrease due to the influence of the outside air temperature, and its viscosity tends to increase. As the viscosity of the upper layer asphalt mixture increases, it becomes difficult to transfer the upper layer asphalt mixture, and it becomes difficult to transfer both the upper layer and the lower layer asphalt mixture. In order to suppress the material separation and temperature drop of the asphalt mixture, it is more important to stir and mix the upper and lower asphalt mixtures than to transfer the asphalt mixture. In particular, when the outside air temperature is low, such as in winter, even if an attempt is made to transfer the upper layer asphalt mixture, the temperature of the upper layer asphalt mixture drops rapidly before the transfer. Therefore, in order to suppress the material separation and temperature decrease of the asphalt mixture, it is important to constantly mix the asphalt mixture of the upper layer and the lower layer.

As described above, if the amount delivered by the screw spreader 51 is insufficient or excessively large, the coarse and fine particles of the asphalt mixture are easily separated, and the asphalt mixture retained in the above-mentioned corners is on the surface (upper part). The closer it is to), the lower the temperature will be due to the influence of the outside temperature, but in reality, as described above, it is agitated by each blade 85 and sequentially mixed with the asphalt mixture in a high temperature state. It is possible to prevent the material of a certain asphalt mixture from separating and the temperature from becoming low. This makes it possible to prevent the asphalt mixture in the corners from becoming a defective mixture, and thus it is possible to suppress deterioration of construction quality due to material separation and temperature decrease of the asphalt mixture. In particular, even when the temperature of the asphalt mixture drops significantly, such as in winter, it is possible to suppress insufficient compaction and poor finished surface, and it is possible to suppress deterioration of construction quality.

As described above, according to the first embodiment, the blade rotation shaft 84 extending along the stretching direction of the screed 60 is provided on the rear side of the spreader 50 and on the front side of the screed 60, and the blade rotation shaft thereof is provided. A plurality of blades 85 are provided on the 84. As the blades 85 rotate in response to the rotation of the blade rotation shaft 84, the asphalt mixture at the corners formed by the screed 60 and the side plate 63 is agitated by each blade 85. As a result, the asphalt mixture in the corner thereof is mixed with the asphalt mixture in a high temperature state sequentially supplied by the spreader 50, and the separation of the material and the decrease in temperature with the lapse of time are suppressed. Therefore, since it is possible to suppress the asphalt mixture in the above-mentioned corners from becoming a defective mixture, it is possible to suppress the deterioration of the construction quality due to the material separation and the temperature decrease of the asphalt mixture.

Further, due to the sliding movement of the support rotation shaft 82 in the left-right direction of the vehicle body 20 and the rotation (swing) of the support column 83 about the support rotation shaft 82 as the rotation center, for example, the type of asphalt mixture (as an example, the particle size). It is possible to adjust any or all of the height position, the front-rear position, and the left-right position of the blade rotation shaft 84 according to the type in which the amount of asphalt is different from that of the asphalt amount). This makes it possible to reliably suppress the asphalt mixture in the above-mentioned corners from becoming a defective mixture, and thus more reliably suppress the deterioration of construction quality due to the material separation and temperature decrease of the asphalt mixture. be able to.

<Second embodiment>
The second embodiment will be described with reference to FIGS. 5 to 11. 5 to 11, (A) is a front view and (B) is a side view. In the second embodiment, the difference from the first embodiment (blade attachment / detachment mechanism) will be described, and other description will be omitted.

(Blade attachment / detachment mechanism)
As shown in FIG. 5, the blade attachment / detachment mechanism according to the second embodiment includes a blade unit 85A and a blade unit 85B. The blade unit 85A and the blade unit 85B are detachably formed at both ends of the blade rotation shaft 84, respectively. The blade unit 85A is attached to the left side of the blade rotation shaft 84 and is located on the side plate 63 (see FIG. 3) side with respect to the support column 83. The blade unit 85B is attached to the right side of the blade rotation shaft 84, and is located on the side opposite to the side plate 63 side with respect to the support column 83.

(Blade unit)
As shown in FIGS. 5, 6 and 7, the blade unit 85A and the blade unit 85B each have a support tube 85a and a plurality of blades 85b.

The support tube 85a is, for example, a tubular member that supports eight blades 85b and forms a set. The support tube 85a is fitted to the blade rotation shaft 84, and is fixed to the blade rotation shaft 84 by a fixing member (not shown) such as a bolt. At this time, the blade rotation shaft 84 is inserted inside the support tube 85a.

As shown in FIG. 6, in the blade unit 85A, each blade 85b is formed in a rectangular plate shape, the longitudinal direction is orthogonal to the extension direction of the support tube 85a, and the lateral direction is the extension direction of the support tube 85a. It is provided on the outer peripheral surface of the support tube 85a so as to be parallel to the (parallel paddle method).

Here, assuming that the position of the leftmost blade 85b shown in FIG. 6 is 0 degrees in the rotation direction A2 of the support tube 85a, the positions of the blades 85b are 0 degrees, 180 degrees, and 90 degrees in the order from left to right. And the position is 270 degrees. The four blades 85b are combined into one set, and two sets thereof are provided. The individual tips of the blades 85b are bent at right angles so as to extend in the rotational direction A2 of the support tube 85a (to extend forward when the position of the blades 85b is 270 degrees). Each such blade 85b pushes the asphalt mixture at the corner formed by the screed 60 and the side plate 63 forward in response to the rotation of the support tube 85a, that is, the blade rotation shaft 84.

As shown in FIG. 7, in the blade unit 85B, each blade 85b is formed in a rectangular plate shape, the longitudinal direction is orthogonal to the extension direction of the support tube 85a, and the lateral direction is the extension direction of the support tube 85a. It is provided on the outer peripheral surface of the support tube 85a so as to be tilted by, for example, 60 degrees (tilted paddle method). In each of the blades 85b whose installation positions are adjacent to each other, the direction in which they are tilted is different.

Here, assuming that the position of the leftmost blade 85b shown in FIG. 7 is 0 degrees in the rotation direction A2 of the support tube 85a, the positions of the blades 85b are 0 degrees, 180 degrees, and 90 degrees in the order from left to right. And the position is 270 degrees. The four blades 85b are combined into one set, and two sets thereof are provided. The individual tips of the blades 85b are formed so as to be inclined with respect to the extending direction of the support tube 85a. Each of such blades 85b pushes out the asphalt mixture in the above-mentioned corner toward the rear center of the vehicle body 20 in response to the rotation of the support pipe 85a, that is, the blade rotation shaft 84.

(Other examples of blade unit)
Next, the blade units 85C, 85D, 85E and 85F, which are other examples of the blade units 85A and 85B described above, will be described with reference to FIGS. 8 to 11. These blade units 85C, 85D, 85E and 85F can be used in place of the blade units 85A and 85B.

As shown in FIG. 8, the blade unit 85C is a modification of the blade unit 85A (see FIG. 6) described above, and the position of the blade 85b is different from that of the blade unit 85A. Assuming that the position of the leftmost blade 85b shown in FIG. 8 is 0 degrees in the rotation direction A2 of the support tube 85a, the positions of the blades 85b are 0 degrees, 90 degrees, 180 degrees and 270 degrees in order from left to right. It becomes the position of. The four blades 85b are combined into one set, and two sets thereof are provided.

As shown in FIG. 9, the blade unit 85D is a modification of the blade unit 85B (see FIG. 7) described above, and the position of the blade 85b is different from that of the blade unit 85B. Assuming that the position of the leftmost blade 85b shown in FIG. 9 is 0 degrees in the rotation direction A2 of the support tube 85a, the positions of the blades 85b are 0 degrees, 90 degrees, 180 degrees and 270 degrees in order from left to right. It becomes the position of. The four blades 85b are combined into one set, and two sets thereof are provided.

As shown in FIG. 10, in the blade unit 85E, each blade 85b is formed in a rod shape, and is provided on the outer peripheral surface of the support tube 85a so that the longitudinal direction is orthogonal to the extension direction of the support tube 85a. Yes (rod method). Assuming that the position of the leftmost blade shown in FIG. 10 is 0 degrees in the rotation direction A2 of the support tube 85a, the positions of the blades 85b are 0 degrees, 60 degrees, 120 degrees, 180 degrees in order from left to right. The positions are 240 degrees and 300 degrees. The six blades 85b are combined into one set, and two sets thereof are provided.

As shown in FIG. 11, the blade unit 85F is a modification of the blade unit 85E (see FIG. 10) described above, and the number and position of the blades 85b are different from those of the blade unit 85E. Assuming that the position of the leftmost blade shown in FIG. 11 is 0 degrees in the rotation direction A2 of the support tube 85a, the positions of the blades 85b are 0 degrees, 45 degrees, 90 degrees, 135 degrees in order from left to right. The positions are 180 degrees, 225 degrees, 270 degrees and 315 degrees. The eight blades 85b are combined into one set, and two sets thereof are provided. Further, the blades 85b at the positions of 0 degrees, 90 degrees, 180 degrees and 270 degrees are formed shorter than the blades 85b at other positions.

As described above, according to the second embodiment, the same effect as that of the first embodiment can be obtained. Further, a plurality of blades 85b are unitized for each predetermined number and are detachably formed on the blade rotation shaft 84. Thereby, for example, each blade 85b can be replaced according to the type of the asphalt mixture (for example, the type having different particle size and asphalt amount). As a result, it becomes possible to reliably suppress the asphalt mixture in the above-mentioned corners from becoming a defective mixture, and thus it is possible to more reliably suppress the deterioration of the construction quality due to the material separation and the temperature decrease of the asphalt mixture. be able to.

Further, each of the blades 85b of the blade units 85A and 85C is formed so as to push out the asphalt mixture in the above-mentioned corner toward the front (traveling direction A1 of the vehicle body 20) in response to the rotation of the blade rotation shaft 84. .. As a result, when each blade 85b rotates in response to the rotation of the blade rotation shaft 84, the asphalt mixture in the corner is agitated while being pushed forward, so that the amount of the asphalt mixture in the corner is reduced. The stirring efficiency can be improved. As a result, it becomes possible to reliably suppress the asphalt mixture in the above-mentioned corners from becoming a defective mixture, and thus it is possible to more reliably suppress the deterioration of the construction quality due to the material separation and the temperature decrease of the asphalt mixture. be able to. Since the temperature decrease of the asphalt mixture, that is, the increase in viscosity is suppressed by stirring, it is easy to push the asphalt mixture in the corners forward. Further, each blade 85b constantly agitates the asphalt mixture according to the rotation of the blade rotation shaft 84 so that material separation does not occur.

Further, each of the blades 85b of the blade units 85B and 85D causes the asphalt mixture in the above-mentioned corners to be placed in the center behind the vehicle body 20 (direction horizontally orthogonal to the traveling direction A1 of the vehicle body 20) in response to the rotation of the blade rotation shaft 84. ) Is formed to be pushed out. As a result, when each of the blades 85b rotates in response to the rotation of the blade rotation shaft 84, the asphalt mixture in the corner is pushed out toward the center of the rear of the vehicle body 20 and stirred, so that the asphalt mixture in the corner is agitated. The amount of stirring can be reduced and the stirring efficiency can be improved. As a result, it becomes possible to reliably suppress the asphalt mixture in the above-mentioned corners from becoming a defective mixture, and thus it is possible to more reliably suppress the deterioration of the construction quality due to the material separation and the temperature decrease of the asphalt mixture. be able to. Since the temperature decrease of the asphalt mixture, that is, the increase in viscosity is suppressed by stirring, it is easy to push the asphalt mixture in the above-mentioned corner toward the rear center of the vehicle body 20. Further, each blade 85b constantly agitates the asphalt mixture according to the rotation of the blade rotation shaft 84 so that material separation does not occur.

Further, since various blade units 85A, 85B, 85C, 85D, 85E, and 85F can be individually combined and used, the asphalt mixture in the above-mentioned corner is mixed to suppress material separation and temperature decrease. Optimal agitation (eg, mixing and flowing conditions of the asphalt mixture) can be adjusted. As a result, it becomes possible to reliably suppress the asphalt mixture in the above-mentioned corners from becoming a defective mixture, and thus it is possible to more reliably suppress the deterioration of the construction quality due to the material separation and the temperature decrease of the asphalt mixture. be able to.

<Other embodiments>
In the above-described embodiment, the number, shape, and mounting position of the blades 85 and 85b are exemplified, but the number, shape, and mounting position of the blades 85 and 85b are not particularly limited. For example, it is also possible to use blades 85, 85b such as a propeller system. However, in order to reliably stir the asphalt mixture, it is desirable to use blades 85 and 85b such as the parallel paddle method, the inclined paddle method, and the rod method as described above.

Further, in the above-described embodiment, it is exemplified that the support column 83 is formed in a straight line, but the present invention is not limited to this, and for example, it may be formed so as to be curved. It is also possible to use support members having other shapes and configurations.

Further, in the above-described embodiment, it is exemplified that the center of the blade rotation shaft 84 is supported by the support column 83, but the present invention is not limited to this, and for example, one end of the blade rotation shaft 84 or one end and the center thereof. You may try to support between.

Further, in the above-described embodiment, it is exemplified that the blade rotation shaft 84 is provided with the extension direction of the blade rotation shaft 84 parallel to the left-right direction of the vehicle body 20 (the extension direction of the screed 60), but the blade rotation shaft 84 is completely parallel. It is not necessary to do so, and the extending direction of the blade rotation shaft 84 and the left-right direction of the vehicle body 20 may be substantially parallel.

Further, in the above-described embodiment, the torque and rotation speed of the motor 86 are adjusted by an adjustment unit such as an adjustment valve, but for example, the rotation direction of the blade rotation shaft 84 is repeatedly changed at a predetermined timing. Alternatively, the torque and rotation speed of the motor of the stirring device 80 may be adjusted according to the traveling speed of the vehicle body 20. As an example, it is possible to increase the torque and rotation speed of the motor as the traveling speed increases, and decrease the torque and rotation speed of the motor as the traveling speed decreases.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof. For example, some components may be deleted from all the components shown in the above-described embodiment. Furthermore, components over different embodiments may be combined as appropriate.

10 Asphalt finisher 20 Body 21 Front wheel 22 Rear wheel 30 Hopper 40 Conveyor 50 Spreader 51 Screw spreader 60 Screed 61 Center screed 62 Side screed 63 Side plate 70 Screed lifting device 71 Leveling arm 72 Leveling cylinder 73 Asphalt Stirrer)
81 Support base 82 Support rotation shaft 83 Support column 84 Blade rotation shaft 85 Blade 85A Blade unit 85B Blade unit 85C Blade unit 85D Blade unit 85E Blade unit 85F Blade unit 85a Support tube 85b Blade 86 Motor 87 Shaft 88 Gear mechanism 90 Control device A1 Direction A2 Rotation direction

Claims (6)

Asphalt that stirs the asphalt mixture in the corners formed by the screed that spreads the asphalt mixture on the surface to be constructed behind the car body by the spreader of the asphalt finisher and the side plate that dams the asphalt mixture that spreads along the screed. It is a mixture stirrer
A blade rotation axis located on the rear side of the spreader and on the front side of the screed and extending along the stretching direction of the screed.
A plurality of blades provided on the blade rotation shaft and agitating the asphalt mixture in the corners according to the rotation of the blade rotation shaft.
An asphalt mixture agitator comprising. A support rotation shaft that extends along the extension direction of the blade rotation shaft, and a support rotation shaft.
A support member provided at the end of the support rotation shaft and extending in a direction intersecting the support rotation shaft to support the blade rotation shaft.
The asphalt mixture agitator according to claim 1, wherein the asphalt mixture agitator is provided. The asphalt mixture agitator according to claim 1 or 2, wherein the asphalt mixture stirring device is provided with a support tube that is detachably fitted to the blade rotation shaft and supports the plurality of blades. Among the plurality of blades, the plurality of blades on the side plate side are formed so as to push the asphalt mixture in the corner portion forward in response to the rotation of the blade rotation shaft. The asphalt mixture agitator according to any one of items 1 to 3. Of the plurality of blades, the plurality of blades on the side opposite to the side plate side are formed so as to push the asphalt mixture in the corner portion toward the rear center of the vehicle body in response to the rotation of the blade rotation axis. The asphalt mixture agitator according to any one of claims 1 to 4, wherein the asphalt mixture stirrer is characterized by the above. An asphalt finisher comprising the asphalt mixture agitator according to any one of claims 1 to 5.

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