JP2019143397A - Pavement material feed mechanism for asphalt finisher - Google Patents

Abstract

To provide a pavement material feed mechanism for asphalt finisher which can be spread evenly on a roadbed in the vehicle width direction even with lightweight materials.SOLUTION: A pavement material feed mechanism M1 comprises a pair of left and right fin conveyors extending from the rear center of a tractor toward the vehicle width direction via a support member at the rear of the tractor. Each belt is rotated such that underside belts of each belt move in the vehicle width direction from the rear center of the tractor. Pavement material dropped from a hopper to the rear of the tractor is fed in the vehicle width direction by each fin 55 moving with the underside belt. The surface of the pavement material is scraped off by the tip of each fin 55. Thus, the pavement material is spread at a uniform height.SELECTED DRAWING: Figure 8

Description

  The present invention is one of construction machines used at a construction site, and is installed at the rear of a tractor in an asphalt finisher that spreads a paving material such as asphalt mixture on a leveled roadbed with a predetermined thickness. The present invention relates to a pavement material feeding mechanism used to spread and spread a pavement material in the vehicle width direction.

  The asphalt finisher is a construction heavy machine that spreads asphalt composites and other pavement materials on the leveled roadbed, and the pavement material loaded on the hopper on the tractor and dropped on the roadbed behind the tractor by the screw unit It's rolled up and roughly shaped with a screed. This type of asphalt finisher is disclosed in, for example, Patent Document 1.

As described in Patent Document 1, an asphalt finisher is a vehicle for paving work, and has a pair of wheels on the front and rear, a tractor mounted with a drive unit that drives the rear wheels, and a tractor A hopper that is provided at the front and loads the asphalt mixture, and a feeder conveyor that is provided at the bottom of the hopper and that transfers the asphalt mixture to the hopper to the rear of the tractor and drops it onto the roadbed from the rear opening of the tractor. A screw spreader that is installed behind the tractor and that spreads the asphalt mixture dropped on the roadbed in the vehicle width direction (left-right direction) on the roadbed, and installed behind the screw spreader behind the tractor, Equipped with a screed that flattens and leveles the surface of the asphalt mixture that can be spread to match the pavement width on the roadbed .
In the pavement construction of the roadbed by this asphalt finisher, first, the hopper is opened, a dump truck loaded with asphalt mixture is attached in front of the asphalt finisher, and the asphalt mixture is transferred from the dump truck into the hopper. When the asphalt mixture is loaded into the hopper, the dump truck moves away from the asphalt finisher, and the asphalt finisher is started by the operation of the operator's driver's seat. In this case, first, the asphalt mixture in the hopper is transferred to the rear of the tractor by the feeder conveyor, and dropped onto the roadbed from the opening at the rear center of the tractor. Subsequently, this asphalt mixture is spread and spread on the roadbed in the vehicle width direction by a screw spreader. Then, asphalt finisher is advanced by driving the rear wheels by driving operation at the driver's seat, and the asphalt mixture spread on the roadbed is spread by screed.
In this way, the asphalt finish is spread on the roadbed to a predetermined thickness by the asphalt finisher. In addition, a road roller stands by behind the asphalt finisher, and the asphalt mixed material spread and leveled by the asphalt finisher is pressed by the road roller to form asphalt pavement.

JP 2011-140784 A

By the way, this type of asphalt finisher generally uses a screw unit as a paving material feeding mechanism for feeding and spreading paving material in the vehicle width direction. This screw unit is composed of a pair of left and right screws, and the screw unit is arranged along the width of the tractor with a predetermined distance from the rear frame of the tractor and to the rear frame of the tractor by a support member, and from the roadbed. Installed at intervals, asphalt mixture is dropped from the center of the tractor between the left and right screws by a feeder from the hopper, and the asphalt mixture is sent to the left and right sides of the tractor by the rotation of each screw. It is designed to spread on the floor.
However, this screw unit can be spread evenly on both the left and right sides of the tractor if the pavement material is a normal asphalt mixture, but when it becomes a light powdery material such as bentonite, the material is removed from the screw unit. There is a problem that they cannot escape and spread on the roadbed uniformly and stably.
In the pavement construction of the roadbed by the asphalt finisher, as described above, the material spread uniformly over the roadbed by the screw unit to some extent is pressed flat from above, but if the material is light, The material loses the weight of the screed and is difficult to be shaped into a uniform plane, and the lighter the material is, the more important it is to spread evenly on the roadbed (before shaping with the screed). Therefore, in place of the screw unit, a new material feeding mechanism that can spread evenly a light weight material on the roadbed is required.

  The present invention solves such a conventional problem. In this type of asphalt finisher, instead of the conventional screw unit, even a light weight material can be uniformly spread on the roadbed in the vehicle width direction. An object of the present invention is to provide a pavement material feeding mechanism used for a possible asphalt finisher.

In order to achieve the above object, the present invention provides:
An asphalt finisher that spreads pavement material on the roadbed with a predetermined thickness and is installed behind the tractor, and spreads the pavement material dropped from the hopper at the front of the tractor to the rear of the tractor in the vehicle width direction. A pavement material feeding mechanism used for
It consists of a pair of finned conveyors extending in the vehicle width direction from the rear center of the tractor via the support member behind the tractor,
Each finned conveyor is
A conveyor frame extending in the vehicle width direction from the rear center of the tractor;
A conveyor roller supported at both ends of the conveyor frame so as to be rotatable in a vertical direction via a shaft disposed in a horizontal direction;
An endless belt that is rotatably wound between the conveyor rollers in a vertical direction;
A driving device for rotationally driving the belt;
A plurality of fins composed of plate-like members attached to the outer surface of the belt so as to extend in a direction substantially perpendicular to the outer surface at a predetermined interval in the direction in which the belt extends;
With
The belt is rotated so that the lower belt of the belt moves in the vehicle width direction from the rear center of the tractor, and the pavement material dropped from the hopper at the front of the tractor to the rear of the tractor together with the lower belt. Sending in the vehicle width direction by the fins of the lower belt moving in the same direction and scraping the surface of the pavement material at the tip of each fin, spread the pavement material at a uniform height,
This is the gist.

Moreover, it is preferable that each part of this pavement feed mechanism is configured as follows.
(1) Each fin has a substantially L-shaped cross section or a substantially T-shaped cross section, and includes a substantially horizontal fixing portion attached to the belt and a fin portion extending substantially vertically from the fixing portion.
(2) Each fin is formed in a substantially Z-shaped cross section as a whole, and has a substantially horizontal fixing portion attached to the belt, and a cross section substantially in a direction perpendicular to the fixing portion and in a direction opposite to the direction in which the pavement is fed. It consists of a fin portion extending in an L shape.
(3) One frame of the conveyor frame is supported so that one end thereof is pivotable upward from a substantially horizontal position via a shaft disposed in the horizontal direction near the rear center of the tractor, and one end is the one of the one frame The other end of the frame is composed of the other frame supported so as to be pivotable downward from a substantially horizontal position via a shaft disposed in the horizontal direction, and each frame projects upward from the substantially horizontal state. A movable frame that is bent into a substantially U-shape to adjust the length of the conveyor frame and guides the upper belt through a conveyor roller, one end of the one frame, and the other end of the other frame And a guide for guiding the lower belt to run substantially horizontally.
In this case, the guide is composed of an extendable frame that can be expanded and contracted in the length direction.
In this case, the guide includes a slide frame having one end fixed to one end of one frame and extending to the other end of the other frame, and the other end of the other frame is slidably engaged in the horizontal direction.
In this case, the guide is composed of one or a plurality of rollers.

  In the pavement material feed mechanism used for the asphalt finisher of the present invention, as described above, the pavement material feeding mechanism includes a pair of finned conveyors extending from the rear center of the tractor toward the vehicle width direction via the support member behind the tractor. The lower belt is rotated so that it moves in the vehicle width direction from the rear center of the tractor, and the pavement material dropped from the hopper at the front of the tractor to the rear of the tractor moves in the same direction along with the lower belt. As the asphalt finisher is used, the conventional screw unit is used to spread the pavement material at a uniform height by feeding it in the vehicle width direction with each fin of the side belt and scraping the surface of the pavement material at the tip of each fin. Instead, it is possible to send light weight material on the roadbed in the vehicle width direction and spread it evenly. Achieve the effect.

Diagram showing the structure of a general asphalt finisher (schematic side view) Diagram showing the configuration of the asphalt finisher (schematic plan view) Diagram showing an example of using the same asphalt finisher (schematic side view) The figure (schematic side view) which shows the structure of the pavement material feed mechanism used for the asphalt finisher by the 1st Embodiment of this invention The figure which shows the usage example of the pavement material feeding mechanism (schematic side view) The figure which shows the usage example of the pavement material feed mechanism (schematic plan view) The figure which shows the usage example of the pavement material feeding mechanism (schematic side view) The figure (schematic side view) which shows the image that the pavement material feed mechanism spreads the pavement material on the roadbed in the vehicle width direction (left and right direction) The figure which shows the example of a change of fin especially of the pavement material feeding mechanism (schematic side view) The figure (schematic side view) which shows the structure of the pavement material feed mechanism used for the asphalt finisher by the 2nd Embodiment of this invention The figure which shows the example of a change of the guide of the paving material feeding mechanism in particular (schematic side view)

Next, embodiments for carrying out the present invention will be described with reference to the drawings.
1 and 2 show a general asphalt finisher exemplified in Patent Document 1, and FIG. 3 shows an example of its use. FIG. 4 shows a pavement material feeding mechanism used in the asphalt finisher according to the first embodiment, FIGS. 5 and 6 show examples of using this pavement material feeding mechanism, and FIG. 7 shows pavement materials by this pavement material feeding mechanism. It shows an image of spreading on the roadbed in the vehicle width direction (left-right direction).

  As shown in FIGS. 1 and 2, the asphalt finisher F is a vehicle for paving work, and as described above, has a pair of wheels 101 and 102 on the front and rear sides, and drives to drive the rear wheels 102. Tractor 1 constituting a vehicle equipped with a portion (not shown), a hopper 11 provided at the front of the tractor 1 for loading asphalt mixture, and an asphalt combination provided at the bottom of the hopper 11 and loaded on the hopper 11 A feeder 2 that transports the material to the rear of the tractor 1 and drops it onto the roadbed from the opening at the rear center of the tractor 1 and an asphalt mixture that is placed behind the tractor 1 and dropped onto the roadbed is placed on the roadbed. Screw unit 3 that spreads and spreads in the vehicle width direction (left and right direction), and is installed behind the tractor 1 and behind the screw unit 3, and spreads on the roadbed. Configured with a flat laying leveled screed 4 the surface of that asphalt mixture.

  The tractor 1 is a vehicle for running an asphalt finisher. In this case, the tractor 1 is configured as a wheeled vehicle having a front wheel 101 and a rear wheel 102 on the vehicle body. The tractor 1 may be a crawler type vehicle having a crawler on the vehicle body. The tractor 1 is equipped with an engine, an exhaust gas processing device, a fuel tank, a hopper, a feeder, and the like.

  The hopper 11 is an apparatus for storing a pavement material, and is a basket mounted on the front portion of the tractor 1, and an upper portion is a hopper wing 111 that can be opened and closed by a hydraulic cylinder 112 to the left and right.

  The feeder 2 is a device that conveys the paving material in the hopper 11 to the rear of the tractor 1, and is mounted at the center in the left-right direction at the bottom of the hopper 11.

  The screw unit 3 includes a pair of left and right screws 3R and 3L. Each of the screws 3R and 3L is provided with a spiral screw blade 32 attached to the rotating shaft 31, and the tractor 1 is supported on the rear surface of the tractor 1 by a support member. The rear surface of the tractor 1 is installed along the width direction of the tractor 1 with a predetermined interval and with a predetermined interval from the roadbed. The asphalt mixture is dropped between the screws 3R and 3L, and spread on the roadbed while being sent to the left and right sides of the tractor 1 by the rotation of the screws 3R and 3L.

  The screed 4 is a device for laying and leveling the paving material. In this case, the screed 4 is composed of a center screed 4C, a right screed 4R slidable in the left and right direction (width direction), and a left screed 4L. The width to be paved can be set by adjusting the right screed 4R and the left screed 4L in accordance with the paving width.

  Thus, first, the hopper 11 (hopper wing 111) is opened, the dump truck loaded with the asphalt mixture is attached in front of the asphalt finisher F, and the asphalt mixture is transferred from the dump truck into the hopper 11. When the asphalt mixture is loaded in the hopper 11, the dump truck is separated from the asphalt finisher F, and the asphalt finisher F is started by an operation at the operator's driver's seat. In this case, as shown in FIG. 3, first, the asphalt mixture A in the hopper 11 is transferred to the rear of the tractor 1 by the feeder 2 and dropped onto the roadbed from the opening at the rear center of the tractor 1. Subsequently, the asphalt mixture A is sent and spread in the vehicle width direction on the roadbed by the screw unit 3 (screws 3R, 3L). Then, the asphalt finisher F is advanced by driving the rear wheel 102 by driving operation at the driver's seat, and the asphalt mixture spread on the roadbed is spread to a predetermined thickness by the screed 4, Roughly shape.

  As shown in FIG. 4, a pavement material feeding mechanism M1 used for an asphalt finisher (hereinafter simply referred to as a pavement material feeding mechanism M1) is an asphalt finisher F described above that spreads a pavement material on a roadbed with a predetermined thickness. In place of the screw unit 3, the pavement material is installed behind the tractor 1, and the pavement material dropped from the hopper 11 at the front of the tractor 1 to the rear of the tractor 1 is spread in the vehicle width direction. M1 includes a pair of left and right finned conveyors 5R and 5L extending in the vehicle width direction from the rear center of the tractor 1 via a support member at the rear portion of the tractor 1. Since the left and right fin conveyors 5R and 5L have the same structure, only the left fin conveyor 5L is shown in FIG. For the pair of left and right finned conveyors 5R and 5L, see FIG.

  Each of the pair of finned conveyors 5R and 5L has a conveyor frame 51 extending in the vehicle width direction (left and right direction) from the rear center of the tractor 1, and a shaft 521 disposed horizontally at both ends of the conveyor frame 51 and at the center between both ends. A conveyor roller 52 supported so as to be rotatable in the vertical direction via the belt, an endless belt 53 wound around the conveyor roller 52 so as to be rotatable in the vertical direction, and a driving device 54 for driving the belt 53 to rotate. The outer surface of the belt 53 includes a plurality of fins 55 made of a plate-like member that is attached to the outer surface of the belt 53 so as to extend in a direction substantially perpendicular to the outer surface at a predetermined interval.

  The conveyor frame 51 is substantially the same as the conventional screw unit 3 (screws 3R, 3L) made of a plurality of frames made of a round steel pipe, C-shaped steel, L-shaped steel, etc., for example, like a belt conveyor used for transporting earth and sand. It is assembled into a long frame of the same length, and bearings (not shown) are provided at both ends and the center of the conveyor frame 51.

  Each of the conveyor rollers 52 is similar to a roller employed in a belt conveyor used for transporting, for example, earth and sand, and can be rotated in the vertical direction via shafts 521 at both ends of the conveyor frame 51 and at the center between both ends. Supported. In this case, the conveyor roller 52 supported at one end of the conveyor frame 51 is disposed as a driving roller, the conveyor roller 52 supported at the other end is disposed as a driven roller, and the central conveyor roller 52 is disposed as a carrier roller.

  The belt 53 is made of an elastic material such as rubber like a belt conveyor used for transporting earth and sand, for example, and is wound around the conveyor rollers 52 so as to be rotatable in the vertical direction. In this case, the belt 53 is rotated along the respective conveyor rollers 52 and travels in the opposite direction between the upper and lower sides between the respective conveyor rollers 52. Therefore, the belt 53 traveling on the upper side is replaced with the upper belt 53. The belt 53 traveling on the lower side is referred to as the lower belt 53.

  The driving device 54 is operatively connected to one end of the conveyor frame 51 or the central conveyor roller 52 in the same manner as a driving motor with a speed reduction adopted for a belt conveyor used for transporting, for example, earth and sand. In this case, since the conveyor roller 52 at one end of the conveyor frame 51 is used as a drive roller, a drive motor with speed reduction is operatively connected to the conveyor roller 52 at one end (hereinafter referred to as drive motor 54).

  As described above, the conveyor equipment including the conveyor frame 51, the conveyor roller 52, the belt 53, and the drive motor 54 has a structure that is almost the same as that of a general belt conveyor used for transporting, for example, earth and sand. A general belt conveyor itself may be directly used for the conveyor facility, and each part of the belt conveyor is appropriately changed to the best state so that the general belt conveyor is suitable for the finned conveyors 5R and 5L. Also good.

  Each of the plurality of fins 55 is formed of a metal material, rubber, plastic, or the like so that the whole is substantially L-shaped in cross section or substantially T-shaped in cross section. It consists of a fin portion 552 extending vertically. In this case, a metal angle member is used for each of the plurality of fins 55, and each fin 55 is formed on the outer surface of the belt 53 with both sides of the fin portion 552 at a predetermined interval in the length direction of the belt 53. The fixing portion 551 is fixed to the outer surface of the belt 53 in the vertical direction, and the fin portion 552 is attached so that both surfaces thereof are directed in the length direction of the belt 53 and extend from the outer surface of the belt 53 in a substantially vertical direction. .

The pavement material feeding mechanism M1 has such a configuration, and as shown in FIGS. 5 and 6, in a general asphalt finisher F, a pair of finned conveyors 5R and 5L are originally disposed at positions where the pair of screws 3R and 3L are installed. Are installed horizontally symmetrically. In this case, the finned conveyors 5R and 5L are arranged on the rear frame of the tractor 1 along the width direction of the tractor 1 with a predetermined distance from the rear frame by the support member and from the roadbed. Installed at a predetermined height. In this manner, as shown in FIG. 7, the belts 53 of the finned conveyors 5R, 5L are rotated so that the lower belt 53 moves in the vehicle width direction from the rear center of the tractor 1, and the tractor 1 The pavement material dropped from the front hopper 11 to the rear of the tractor 1 is sent in the vehicle width direction by the fins 55 of the lower belt 53 that moves in the same direction together with the lower belt 53 and at the tip of each fin 55. By scraping the surface of the pavement material, the pavement material can be spread and spread to a uniform height.
That is, each of the finned conveyors 5R and 5L does not carry the material on the belt as in the belt conveyor, but is used by inverting the top and bottom when viewed as a belt conveyor. The pavement material discharged and deposited on the pavement material is scraped to the width of the tractor 1 in the width direction of the tractor 1 (left and right direction) to the pave width end, and the pavement material is scraped by each fin 55. Each time it is sent, the tip of each fin 55 is used to scrape off the excess of the surface of the paving material above a certain height. The surplus is spilled from the edge of the paving, and the surface of the paving material is pulled from the center of the tractor 1 to the tractor. In the width direction of 1 (left-right direction), it is spread out evenly to a fixed height to the pavement width end.

In FIG. 8, a powdery light material such as bentonite is loaded as a paving material in the hopper 11, this powdery material is transferred to the rear side of the tractor 1 by the feeder 2, and dropped onto the roadbed from the opening at the rear center of the tractor 1. In this case, the image shows that the material is spread and spread in the vehicle width direction (left and right direction) on the roadbed by a pair of finned conveyors 5R and 5L (the right finned conveyor 5R is not shown).
As shown in FIG. 8, since each fin 55 of the belt 53 on the lower side of the conveyor 5L with fins runs horizontally, the powdery material discharged and deposited at the rear center of the tractor 1 Each fin 55 of the belt 53 is scraped to the pave width end in the width direction (left direction) of the tractor 1 and each time the powdery material is scraped by each fin 55 traveling horizontally, the tip of each fin 55 The surplus of the surface of the material over a certain height is scraped off (scraped), the surplus of material is spilled from the end of the pavement width, and the surface of the powdery material is removed from the center of the tractor 1 in the width direction of the tractor 1 (left In the direction), spread the material evenly at a certain height up to the paving width end.

  As described above, the pavement material feeding mechanism M1 includes the pair of left and right finned conveyors 5R extending in the vehicle width direction from the rear center of the tractor 1 via the support member at the rear portion of the tractor 1 as described above. 5L, the belt 53 is rotated so that the belt 53 below the belt 53 moves from the rear center of the tractor 1 in the vehicle width direction, and dropped from the hopper 11 at the front of the tractor 1 to the rear of the tractor 1. The pavement material is sent in the vehicle width direction by each fin 55 of the lower belt 53 moving in the same direction together with the lower belt 53 and the surface of the pavement is scraped off at the tip of each fin 55 to make the pavement material uniform. In the asphalt finisher F, instead of the conventional screw unit 3, even a light weight material is sent on the roadbed in the vehicle width direction, and evenly distributed. It can be expanded come.

Further, the pavement material feeding mechanism M1 has the following advantages.
(1) Since each of the finned conveyors 5R and 5L has a flat and long structure, it can be installed in a general asphalt finisher F instead of the originally installed screw unit 3 in its arrangement space. .
(2) Powdery material is scraped from the rear center of the tractor 1 in the vehicle width direction by the fins 55 of the lower belt 53 that runs horizontally on the finned conveyors 5R and 5L, and this material is also applied to the roadbed. Therefore, it is possible to spread the powdery material difficult to be shaped into a uniform flat surface by the conventional screw unit 3 on the roadbed. It can be shaped into a uniform plane without any increase or decrease (high or low) in some places.
(3) The powdery material is scraped from the rear center of the tractor 1 in the vehicle width direction by each fin 55 of the lower belt 53 that runs horizontally on each fin conveyor 5R, 5L, and this material is finally sent Since the material is spilled from the pave width end, it is immediately known whether or not the material has reached the pave width end. By looking at the amount of material spilled from the pave width end, the hopper 1 from the front of the tractor 1 It is only necessary to control the amount of the material supplied to the rear, and the adjustment of the material supply amount is facilitated.
(4) Since each fin conveyor 5R, 5L receives a load only for the material scraped by each fin 55, the power for rotationally driving each fin 55 may be small.

In this embodiment, each fin 55 is formed in a substantially L-shaped cross section or a substantially T-shaped cross section, and has a substantially horizontal fixing portion 551 attached to the belt 53 and a fin extending substantially vertically from the fixing portion 551. 9, each fin 55 has a substantially Z-shaped cross section as a whole, and has a substantially horizontal fixing portion 551 attached to the belt 53 and a substantially horizontal fixing portion 551. It is good also as what consists of the fin part 552 extended in a cross-sectional substantially L shape toward the direction opposite to the direction which sends a pavement material vertically.
By doing in this way, the effect similar to the said embodiment can be show | played, Furthermore, thickness can be made at the front-end | tip of the fin part 552, and the paving material (a powdery material is included) is scraped off, In addition to scraping, the pavement material (including powdered material) can be pressed from above, that is, the pavement material can be squeezed. The pavement is spread to a certain height by each fin 55. The material can be further leveled by the thickness of the tip of each fin 55.
Further, in this embodiment, the conveyor frame 51 of the conveyor facility is assembled into a long frame by a plurality of frames made of round steel pipe, C-shaped steel, L-shaped steel, etc., and the conveyor roller 52, belt 53, drive Although the motor 54 and the belt conveyor have substantially the same structure, the conveyor frame 51 may be constituted by a boom instead of the frame material, and the boom is provided with a conveyor roller in substantially the same manner as in the above embodiment. 52, belt 53, and drive motor 54 may be combined.
Even if it does in this way, there can exist an effect similar to the said embodiment.

FIG. 10 shows a pavement feed mechanism (hereinafter referred to as a pavement feed mechanism M2) used for the asphalt finisher according to the second embodiment.
As shown in FIG. 10, the pavement material feeding mechanism M2 is similar to the first embodiment in the asphalt finisher F described above that spreads the pavement material on the roadbed with a predetermined thickness, Instead, the pavement material that is installed behind the tractor 1 and dropped from the hopper at the front of the tractor 1 to the rear of the tractor 1 is spread in the vehicle width direction. It consists of a pair of left and right finned conveyors 6R and 6L extending in the vehicle width direction from the rear center of the tractor via a support member at the rear. In FIG. 10, only the left-side finned conveyor 6R is shown. Each of these finned conveyors 6R and 6L includes a conveyor frame 61 extending in the vehicle width direction (left-right direction) from the rear center of the tractor 1, and a shaft 621 disposed horizontally at both ends of the conveyor frame 61 and the center between both ends. A conveyor roller 62 that is rotatably supported in the vertical direction, an endless belt 63 that is rotatably wound between the conveyor rollers 62, and a driving device 64 that rotationally drives the belt 63. The outer surface of the belt 63 is configured to include a plurality of fins 65 made of a plate-like member attached so as to extend in a direction substantially perpendicular to the outer surface at a predetermined interval in the direction in which the belt 63 extends.
In the pavement material feeding mechanism M2, unlike the first embodiment, the conveyor frame 61 is lifted from a substantially horizontal position via a shaft 621 having one end disposed in the horizontal direction near the center of the rear portion of the tractor 1. One frame 611 supported so as to be rotatable in the direction, and one end thereof is supported so as to be rotatable downward from a substantially horizontal position via a shaft 621 disposed in the horizontal direction at the other end of the one frame 611. The other frame 612, each frame 611, 612 is bent upward from a substantially horizontal state into a convex substantially square shape, the length of the conveyor frame 61 is adjusted, and the upper side via the conveyor roller 62 The movable frame 61A that travels and guides the belt 63 is disposed substantially horizontally between one end of one frame 611 and the other end of the other frame 612, and the lower belt 63 is disposed substantially horizontally. Comprising a guide 61B which travel guidance.

Each of the frames 611 and 612 constituting the movable frame 61A of the conveyor frame 61 is conventionally made of a plurality of frames made of a round steel pipe, C-shaped steel, L-shaped steel, etc., like a belt conveyor used for transporting earth and sand, for example. Is assembled into a long frame having a length approximately one-half of the screw unit 3 (screws 3R, 3L), and the other frame 612 is pivotally supported at the other end of the one frame 611. Bearings (not shown) are provided at both ends, and bearings (not shown) are provided at the other end of the other frame 612.
Further, the guide 61B of the conveyor frame 61 is composed of an extendable frame that can be extended and contracted in the length direction (hereinafter referred to as an extendable frame 61B). In this case, the telescopic frame 61B is formed by a pair of pipes, and each pipe has a central inner pipe and an outer pipe that can be fitted into both ends of the inner pipe in a nested manner. The length of the entire pipe can be adjusted by sliding. In addition, a plurality of lock holes are formed in the axial direction at both ends of the inner pipe and each outer pipe, and after adjusting the length between the inner pipe and each outer pipe, each lock of the inner pipe and each outer pipe The holes are aligned and a lock pin is passed between the lock holes and fixed. In addition, each pipe is good also as what consists of an inner pipe which can be fitted in the both ends of a center outer pipe, and an outer pipe at both ends by making an inner pipe and an outer pipe opposite. Further, the outer pipe and each inner pipe may be fixed by screws instead of the lock pins.

  Each conveyor roller 62 is the same as that of the first embodiment, and rotates in the vertical direction through the shaft 621 to the bearings at both ends of one frame 611 of the conveyor frame 61 and the other end of the other frame 612, respectively. Supported as possible. In this case, the conveyor roller 62 supported at one end of one frame 611 is a drive roller, the conveyor roller 62 supported at the other end is a carrier roller, and the conveyor roller 62 at the other end of the other frame 612 is driven. Arranged as a roller.

  As in the first embodiment, the belt 63 is wound around the conveyor rollers 62 and is rotatable in the vertical direction. In this case as well, the belt 63 is rotated along each conveyor roller 62 and travels in the opposite direction between the upper and lower sides between the conveyor rollers 62. Therefore, the belt 63 traveling on the upper side is used as the upper belt. 63 and the belt 63 traveling on the lower side are referred to as the lower belt 63.

  Similarly to the first embodiment, the driving device 64 is a drive motor with a speed reduction, and is operatively connected to one end of the conveyor frame 61 or the central conveyor roller 62. In this case, since the conveyor roller 62 at one end of one frame 61 is used as a drive roller, a drive motor with speed reduction is operatively connected to the conveyor roller 61 at one end (hereinafter referred to as a drive motor 64).

  As described above, a general belt conveyor itself may be directly used for the conveyor equipment including the conveyor frame 61, the conveyor roller 62, the belt 63, and the drive motor 64. Each part of the belt conveyor may be appropriately changed to the best state so as to be suitable for the finned conveyors 6R and 6L.

The plurality of fins 65 are the same as those in the first embodiment, and are each formed in a substantially L-shaped cross section or a substantially T-shaped cross section, and a substantially horizontal fixing portion 651 attached to the belt 63 and a fixing portion 651. And a fin portion 652 extending substantially vertically. In this case, a metal angle member is used for the plurality of fins 65, and each fin 65 has the length of the belt 63 on both sides of the fin portion 652 on the outer surface of the belt 63 at predetermined equal intervals in the length direction of the belt 63. The fixing portion 651 is fixed to the outer surface of the belt 63 toward the direction, and the fin portion 652 is attached so that both surfaces thereof are directed in the length direction of the belt 63 and extend from the outer surface of the belt 63 in a substantially vertical direction.
Further, as described above, each fin 65 is formed in a substantially Z-shaped cross section as a whole, and has a substantially horizontal fixing portion 651 attached to the belt 63, and a direction in which the pavement material is fed substantially vertically from the fixing portion 651. May comprise a fin portion 652 extending in a substantially L-shaped cross section in the opposite direction.

  The pavement material feed mechanism M2 has such a configuration. Referring to FIGS. 5 and 6, in a general asphalt finisher F, a pair of fin conveyors 6R and 6L are originally provided at positions where a pair of screws 3R and 3L are installed. It is installed horizontally symmetrically. In this case, the left and right finned conveyors 6R and 6L are arranged on the rear frame of the tractor 1 along the width direction of the tractor with a predetermined distance from the rear frame by a support member and from the roadbed. Installed at a height of In this way, the belts 63 of the finned conveyors 6R and 6L are rotated so that the lower belt 63 moves in the vehicle width direction from the rear center of the tractor 1, and from the hopper 11 at the front of the tractor 1 to the tractor 1. The pavement material dropped behind is sent in the vehicle width direction by the fins 65 of the lower belt 63 moving in the same direction together with the lower belt 63 and the surface of the pavement material is scraped off at the tip of each fin 65. It is designed to spread paving material at a uniform height.

Even if it does in this way, there can exist the same effect as 1st Embodiment.
Further, in the pavement material feeding mechanism M2, the conveyor frame 61 is supported so that one end thereof can be rotated upward from a substantially horizontal position via a shaft 621 disposed in the horizontal direction near the rear center of the tractor 1. One frame 611 and the other frame 612, one end of which is supported to be pivotable downward from a substantially horizontal position via a shaft 621 disposed in the horizontal direction at the other end of the one frame 611, The frames 611 and 612 are bent upwards from a substantially horizontal state into a convex substantially square shape so that the length of the conveyor frame 61 can be adjusted, and the upper belt 63 can be run and guided via the conveyor roller 62. An elastic frame which is disposed substantially horizontally between the frame 61A and one end of one frame 611 and the other end of the other frame 612 and guides the lower belt 63 to run substantially horizontally. 61B, the frames 611 and 612 of the movable frame 61A are bent upwards into a convex substantially square shape, and the length of the conveyor frame 61 is reduced by contracting the telescopic frame 61B. On the other hand, by increasing the angle between the frames 611 and 612 of the movable frame 61A and extending the telescopic frame 61B, the length of the conveyor frame 61 can be increased. The length of the conveyor frame 61 can be adjusted according to the paving width. Therefore, the pavement material containing the powdery material can be spread out on the roadbed with high accuracy.
In this paving material feed mechanism M2, the length of each conveyor frame 61 may be adjusted manually using a construction machine such as a crane, and each conveyor frame 61 is driven by a hydraulic cylinder or winch. This may be automated.

In this embodiment, the guide 61B is made of an extendable frame that can extend and contract in the length direction. However, the guide 61B has one end fixed to one end of one frame 611 as shown in FIG. The other frame 612 may extend to the other end, and the other frame 612 may be formed of a slide frame that is slidably engaged in the horizontal direction (hereinafter referred to as a slide frame 61B). In this case, the slide frame 61B is composed of a pair of pipes, and the shaft or bearing of the conveyor roller 62 at the other end of the other frame 612 is fitted on the slide frame 61B so as to be slidable on the slide frame 61B. Further, the guide 61B is not particularly illustrated, but may be composed of one or a plurality of rollers.
Even if it does in this way, there can exist an effect similar to the said embodiment.
In this embodiment, the conveyor frame 61 is configured such that the movable frame 61A of the conveyor frame 61 is assembled into a long frame by a plurality of frames made of round steel pipe, C-shaped steel, L-shaped steel, etc. The belt 63 and the drive motor 64 have substantially the same structure as that of the belt conveyor. However, the conveyor frame 61 may be configured by a boom instead of the frame material, and the boom is substantially the same as the above embodiment. In addition, a conveyor roller, a belt, and a drive motor may be combined.
Even if it does in this way, there can exist an effect similar to the said embodiment.

F Asphalt finisher 1 Tractor 101, 102 Wheel 11 Hopper 111 Hopper wing 112 Hydraulic cylinder 2 Feeder 3 Screw unit 3R (Right) Screw 3L (Left) Screw 31 Rotating shaft 32 Screw blade 4 Screed 4C Center screed 4R Right screed 4L Left Screed M1 Paving material feed mechanism used for asphalt finisher 5R (right) finned conveyor 5L (left) finned conveyor 51 conveyor frame 52 conveyor roller 521 shaft 53 belt 54 drive device (drive motor)
55 Fin 551 Fixed portion 552 Fin portion M2 Pavement material feed mechanism used for asphalt finisher 6R Conveyor with fin 6R (Right) Conveyor with fin 61 Conveyor frame 61A Movable frame 611 One frame 612 Other frame 61B Guide 62 Conveyor roller 621 Axis 63 Belt 64 Drive device (drive motor)
65 Fin 651 Fixed part 652 Fin part

Claims (7)

An asphalt finisher that spreads pavement material on the roadbed with a predetermined thickness and is installed behind the tractor, and spreads the pavement material dropped from the hopper at the front of the tractor to the rear of the tractor in the vehicle width direction. A pavement material feeding mechanism used for
It consists of a pair of finned conveyors extending in the vehicle width direction from the rear center of the tractor via the support member behind the tractor,
Each finned conveyor is
A conveyor frame extending in the vehicle width direction from the rear center of the tractor;
A conveyor roller supported at both ends of the conveyor frame so as to be rotatable in a vertical direction via a shaft disposed in a horizontal direction;
An endless belt that is rotatably wound between the conveyor rollers in a vertical direction;
A driving device for rotationally driving the belt;
A plurality of fins composed of plate-like members attached to the outer surface of the belt so as to extend in a direction substantially perpendicular to the outer surface at a predetermined interval in the direction in which the belt extends;
With
The belt is rotated so that the lower belt of the belt moves in the vehicle width direction from the rear center of the tractor, and the pavement material dropped from the hopper at the front of the tractor to the rear of the tractor together with the lower belt. Sending in the vehicle width direction by the fins of the lower belt moving in the same direction and scraping the surface of the pavement material at the tip of each fin, spread the pavement material at a uniform height,
A pavement material feed mechanism used for asphalt finishers.   2. The asphalt according to claim 1, wherein each fin is formed in a substantially L-shaped cross section or a substantially T-shaped cross section, and includes a substantially horizontal fixing portion attached to the belt and a fin portion extending substantially vertically from the fixing portion. Pavement feed mechanism used for finishers.   Each fin has a substantially Z-shaped cross section as a whole, and has a substantially horizontal fixing portion attached to the belt, and a substantially L-shaped cross section in a direction substantially perpendicular to the fixing portion and opposite to the direction in which the pavement is fed. The pavement material feeding mechanism used for the asphalt finisher according to claim 1, comprising a fin portion extending.   The conveyor frame has one end supported so as to be pivotable upward from a substantially horizontal position via a shaft disposed in the horizontal direction near the rear center of the tractor, and the other end of the one frame. It consists of the other frame supported so as to be pivotable downward from a substantially horizontal position via a shaft disposed in the horizontal direction at the end, and each of the frames is generally convex upward from a substantially horizontal state. Between the one end of the one frame and the other end of the other frame. The pavement material feeding mechanism used for the asphalt finisher according to any one of claims 1 to 3, further comprising a guide that is disposed substantially horizontally and guides the lower belt to travel substantially horizontally.   The pavement material feeding mechanism used for the asphalt finisher according to claim 4, wherein the guide is formed of an extendable frame that can extend and contract in the length direction.   The guide is composed of a slide frame, one end of which is fixed to one end of one frame and extends to the other end of the other frame, and the other end of the other frame is slidably engaged in the horizontal direction. Pavement feed mechanism used for asphalt finishers.   The pavement material feeding mechanism used for the asphalt finisher according to claim 4, wherein the guide includes one or a plurality of rollers.

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