JP2014080741A - Asphalt finisher and side screw device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To spread a mixture uniformly over the whole width of an execution object surface to ensure an excellent quality of a pavement complete body in an asphalt finisher without leaving the mixture in a corner part of an end plate and without depending on man-powered work.SOLUTION: A side screw device (1) is attached to end plates (25) respectively extending forward from tip positions of side screeds (24b) protruding in a longitudinal direction from a vehicle body side walls (26) of an asphalt finisher (20). The side screw device (1) is provided with screw blades (6a, 6b) extending in a longitudinal direction in the vicinity of inner surfaces (25a) of the end plates (25) respectively and rotationally driven to transfer a mixture forward.

Description

  The present invention relates to an asphalt finisher that is a construction machine for paving and a side screw device attached to the asphalt finisher.

  The asphalt finisher is a construction machine for paving for spreading and leveling an asphalt mixed material (hereinafter referred to as “compound”) with a predetermined thickness and width for asphalt paving such as roads.

  FIG. 6 is a plan view schematically showing a conventional general form of asphalt finisher 100. Arrows indicate the front-rear direction of the asphalt finisher 100. The asphalt finisher 100 includes a prime mover and traveling means (not shown) such as wheels or crawlers. When constructing asphalt pavement, it will self-propelled in the forward direction. The asphalt finisher 100 is generally composed of a hopper 21 and a conveyor 22 at the front part, a driver's cab 27 and a drive mechanism (not shown) at the center part, and a screed body 24 at the rear part. Since the structure of the main part of the asphalt finisher 100 is basically symmetrical, the same components are denoted by the same reference numerals.

  At the time of construction, the drive mechanism is driven by the operation of the worker at the driving operation seat on the cab 27. The composite material dropped onto the hopper 21 from a dump truck or the like is transferred rearward under the floor surface of the cab 27 by the conveyor 22 (see white arrow) and dropped onto the construction target surface before the screed body 24. . Part of the composite material dropped on the construction target surface is transferred in the left-right direction by the left and right transfer screw blades 23 (see white arrows), and the composite material is spread over the entire width of the construction target surface. . The screed body 24 is composed of a central screed 24a and side screeds 24b protruding from the vehicle body side wall 26 of the asphalt finisher 100 in the left-right direction. The transfer of the mixed material in the left-right direction is limited by end plates 25 provided at the left and right ends of the side screed 24b.

The composite material is a mixture of straight asphalt and aggregate (sand, gravel, crushed stone, etc.) at about 160 ° C. The quality of the finished pavement by mixing and leveling depends on the temperature, particle size and density of the mixing material when leveling. It is required to eliminate unevenness in the temperature, particle size, and density of the mixture during leveling and to construct a uniform leveling surface.
Patent Documents 1 and 2 are examples of conventional asphalt finishers.

JP-A-9-217314 2004-84345 gazette

The conventional asphalt finisher has the following problems.
In the conventional asphalt finisher shown in FIG. 6, the mixed material transferred by the left and right transfer screw blades 23 moves along the front surface of the side screed 24b, and the end plate 25 prevents further movement in the left and right directions. Is done. For this reason, a certain amount of surplus composite material M always remains in the corner formed by the end plate 25 and the side screed 24b. The surplus composite material M remaining in the corner is lifted by the fresh composite material that is sequentially fed, causing a temperature drop with time, and becomes a defective composite material.

  As a means to deal with the defective composite material, the worker breaks the surplus composite material M staying at the corner of the end plate 25 and replaces it with a fresh composite material, or removes the defective composite material. It was. However, in the method that relies on manual work, temperature unevenness of the mixture and deviation of the particle size are unavoidable, and these cause density unevenness. As a result, it was difficult to ensure the quality of the finished pavement.

  In Patent Documents 1 and 2 as countermeasures other than manual work, heating means for heating the end plate with a gas burner or the like is provided to prevent a temperature drop. However, even if the temperature can be maintained, the problem that the composite material stays in the corners has not been solved, and density unevenness still occurs. Moreover, installation of a heating means is required.

  The purpose of the present invention is to spread the uniform material uniformly over the entire width of the construction target surface without retaining the composite material at the corner of the end plate in order to ensure good quality of the paved finished body in the asphalt finisher. The goal is to achieve this without relying on manual work.

  In order to achieve the above object, the present invention provides the following configurations. The numbers in parentheses are reference numerals in the drawings showing examples of embodiments to be described later, and are given for reference.

  One aspect of the present invention is a side screw device that is attached to an end plate (25) that extends forward from a tip position of a side screed (24b) that protrudes in the left-right direction from a vehicle body side wall (26) of an asphalt finisher (20). 1) provided with screw blades (6a, 6b) extending in the front-rear direction in the vicinity of the inner surface (25a) of the end plate (25) and rotated to transfer the mixture forward It is characterized by that.

  In the above aspect, it is preferable that the screw blades (6a, 6b) are installed at predetermined positions by being supported by a support member attached to the end plate (25).

  In the above aspect, it is preferable that the support member has means for adjusting the vertical position of the screw blade (6a, 6b).

  In the above aspect, it is preferable that the support member has means for adjusting the position of the screw blades (6a, 6b) in the front-rear direction.

  In the above aspect, the support member includes a rail receiving member (2) that extends in the front-rear direction on the inner surface (25a) of the end plate (25) and is fixed to the end plate (25); A rail member (3) extending along the receiving member (2) and fixed to the rail receiving member (2); a suspension member (4a, 4b) having an upper end fixed to the rail member (3); A screw bearing member (5a, 5b) fixed to the lower end of the suspension member (4a, 4b) and rotatably supporting the screw shaft (7) which is the shaft of the screw blade (6a, 6b); Is preferred.

  In the above aspect, it is preferable that the position at which the rail receiving member (2) is fixed to the end plate (25) can be adjusted in the vertical direction.

  In the above aspect, it is preferable that the position for fixing the rail member (3) to the rail receiving member (2) can be adjusted in the front-rear direction.

  Another aspect of the present invention is an asphalt finisher including the side screw device.

  By the side screw device according to the present invention, the mixed material that has been transferred in the left-right direction along the side screed of the screed body of the asphalt finisher and reached the end plate is pressed against the end plate by the rotation of screw blades extending in the front-rear direction. While being transported forward. As a result, fresh compound material is always supplied at the corners of the end plate, and old compound material does not stay. Therefore, it is possible to spread the composite material uniformly over the entire width of the construction target surface. Further, even when the composite material is stirred and consolidated by the rotating screw blades, unevenness in temperature, particle size and density can be eliminated, and uniform spread of the composite material can be realized. By this invention, it is implement | achieved to ensure the favorable quality of a paved finished body, without resorting to a manual work.

FIG. 1 is a plan view schematically showing an asphalt finisher to which the present invention is applied. FIG. 2 is a schematic side view showing the side screw device shown in FIG. 1 together with an end plate. FIG. 3 is a schematic plan view corresponding to FIG. 4 (a), 4 (b), and 4 (c) are respectively an X arrow view, a Y arrow view, and a Z arrow view in FIG. FIG. 5 is a schematic view of the attachment process. FIG. 6 is a plan view schematically showing a conventional general form of asphalt finisher.

  Hereinafter, embodiments of an asphalt finisher to which the present invention is applied and a side screw device attached thereto will be described with reference to the drawings. The illustrated embodiment of the asphalt finisher and the side screw device is an example, and the specific shape and number of each component of the present invention are not limited to the illustrated example as long as the principle of the present invention is followed. .

  FIG. 1 is a plan view schematically showing an asphalt finisher 20 to which the present invention is applied. In addition, the same code | symbol is shown about the component which is common in the general asphalt finisher 100 shown in FIG. In addition, about the general component part among the structures of the asphalt finisher 20, you may replace with a well-known various form, and you may add a well-known various component. The arrows indicate the front-rear direction of the asphalt finisher 20. A direction perpendicular to the front-rear direction is referred to as a left-right direction.

  The asphalt finisher 20 includes a prime mover and traveling means (not shown) such as wheels or crawlers. When constructing asphalt pavement, it will self-propelled in the forward direction. The asphalt finisher 20 is generally composed of a hopper 21 and a conveyor 22 at the front part, a driving cab 27 and a drive mechanism (not shown) at the center part, and a screed body 24 at the rear part. Since the configuration of the main part of the asphalt finisher 20 is basically symmetrical, the same components are denoted by the same reference numerals.

  At the time of construction, the drive mechanism is driven by the operation of the worker at the driving operation seat on the cab 27. Although not shown in the drawings, the drive mechanism includes a travel drive unit for traveling the asphalt finisher and a hydraulic drive unit for transferring, leveling and compacting the composite material. The composite material dropped onto the hopper 21 from a dump truck or the like is transferred rearward under the floor surface of the cab 27 by the conveyor 22 (see white arrow) and dropped onto the construction target surface before the screed body 24. . Part of the composite material dropped on the construction target surface is transferred in the left-right direction by the left and right transfer screw blades 23 (see white arrows), and the composite material is spread over the entire width of the construction target surface. .

  The screed body 24 includes, for example, a central portion (hereinafter referred to as “central screed” and denoted by reference numeral 24 a) having substantially the same width as the vehicle body of the asphalt finisher 20, and protruding portions (hereinafter referred to as “side” It is called “screed” and indicated by reference numeral 24b). The central screed 24a and the side screed 24b serve to spread and level the composite material.

  The movement of the mixed material in the left-right direction is limited by the end plate 25. The end plate 25 extends with a predetermined length from the front end position of the side screed 24b toward the front. The end plate 25 has a predetermined height from directly above the construction target surface, and is attached to the side screed 24b so as to be perpendicular to the construction target surface. Here, in the end plate 25, the surface facing the vehicle body side wall 26 is referred to as an inner surface, and the opposite surface is referred to as an outer surface. When the mixed material hits the inner surface of the end plate 25, further movement in the left-right direction is prevented.

  The position of the end plate 25 in the left-right direction is set according to the width of the construction target surface. By changing the protruding length of the side screed 24b from the vehicle body side wall 26, the position of the end plate 25 can be changed. The means for changing the protruding length of the side screed 24b is well known and will not be described here.

  The composite material is a mixture of straight asphalt and aggregate (sand, gravel, crushed stone, etc.) at about 160 ° C.

  The asphalt finisher 20 to which the present invention is applied is characterized by including the side screw device 1. The side screw device 1 includes screw blades installed so as to extend in the front-rear direction near the inner surface of the end plate 25. This screw blade is rotationally driven so as to transfer the mixture forward. Accordingly, the composite material that has reached the end plate 25 by the left and right screw blades 23 changes its direction forward and is transferred, as indicated by the white arrow.

  A hydraulic hose 10 extending from the hydraulic controller 11 shown in FIG. 1 is connected to the side screw device 1 and rotationally drives the screw blades of the side screw device 1 by hydraulic pressure. The hydraulic controller 11 is connected to a hydraulic drive unit (not shown) in the drive mechanism of the asphalt finisher 20 and is supplied with hydraulic oil. In addition, in FIG. 1, although the hydraulic hose 10 is shown with one line, it is actually comprised from two hoses of an oil supply path and an oil discharge path.

  FIG. 2 is a schematic side view showing the side screw device 1 shown in FIG. 1 together with the end plate 25, as viewed from the inner surface 25 a side of the end plate 25. FIG. 3 is a schematic plan view corresponding to FIG. 4 (a), 4 (b), and 4 (c) are respectively an X arrow view, a Y arrow view, and a Z arrow view in FIG. The side screw device 1 will be described with reference to these drawings.

  The screw blade 6a is formed of a blade provided in a spiral shape around the screw shaft 7 which is a rotational drive shaft. The screw blade 6 a is installed in the vicinity of the inner surface 25 a of the end plate 25 by an appropriate support member attached to the end plate 25. The screw shaft 7 is disposed along the front-rear direction. The screw blades 6a are spaced apart from each other so as not to collide with the inner surface 25a of the end plate 25 in the left-right direction, and are installed at predetermined positions in the front-rear direction. Further, the screw blade 6a is installed at a position having a predetermined height from the plane of symmetry in the vertical direction.

  The screw shaft 7 is rotatably supported by screw bearing members 5a and 5b at both end positions of the screw blade 6a. The screw shaft 7 extends further rearward than the screw bearing member 5a on the rear side, and an auxiliary screw blade 6b is provided in this portion. The position of the auxiliary screw blade 6b substantially corresponds to the position of the right-angled corner formed by the end plate 25 and the side screed 24b in the plan view of FIG. As the screw shaft 7 rotates, the auxiliary screw blade 6b transfers the composite material positioned at the corner forward, and the screw blade 6a transfers the composite material further forward. The screw blade 6a and the auxiliary screw blade 6b have the same diameter and pitch, and may be collectively referred to as “screw blade”. The positions of the screw blades including the screw blades 6a and the auxiliary screw blades 6b in the left, right, front, back, and top and bottom directions are determined so that the forward transfer of the composite material can be efficiently performed. Similarly, the diameter and pitch of the screw blades are appropriately selected.

  The screw shaft 7 extends further forward than the screw bearing member 5b on the front side, and a hydraulic motor 9 is attached to the tip on the shaft. The screw shaft 7 is rotationally driven by the hydraulic motor 9. A coupling 8 is interposed between the shaft of the hydraulic motor 9 and the screw shaft 7. The coupling 8 is a well-known member generally used for connecting a motor shaft and a driven shaft. Although not shown in FIG. 2, one end of a hydraulic hose 10 (comprising two oil supply passages and an oil discharge passage) shown in FIG. 1 is connected to the hydraulic motor 9.

  In the winding direction of the screw blade shown in the drawing, the screw shaft 7 is rotated counterclockwise (see the arrow) as viewed from the rear side, whereby the mixture is transferred forward. When the winding direction of the screw blades is reversed, the connection of the hydraulic hose to the hydraulic motor 9 may be reversed so as to rotate rightward when viewed from the rear side. Further, it is possible to start and stop the rotation of the screw blades and change the rotation speed under the control of the hydraulic controller 11 shown in FIG.

  The support members for supporting the screw blades composed of the screw blades 6a and the auxiliary screw blades 6b are screw bearing members 5a and 5b, and rod-like suspensions that fix the screw bearing members 5a and 5b to their lower ends and extend in the vertical direction. Members 4a and 4b. The figure which looked at the suspension member 4b from the front side is shown by Fig.4 (a). The support member further includes a rail member 3 to which the upper ends of the suspension members 4a and 4b are fixed, and a rail receiving member 2 to which the rail member 3 is fixed.

  The upper end of a coupling support plate 4 c that is attached between the screw bearing member 5 b on the front side and the coupling 8 and supports and fixes the coupling 8 is also fixed to the rail member 3. A view of the coupling support plate 4c as viewed from the front is shown in FIG.

  Further, an upper end of a motor support plate 4 d that is attached between the coupling member 8 and the hydraulic motor 9 and supports and fixes the motor 9 is also fixed to the rail member 3. A view of the motor support plate 4d as viewed from the front is shown in FIG.

  The constituent members in the present invention are typically made of steel, and the constituent members are fixed using appropriate means such as bolt-nut tightening or welding. For example, the component members that are permanently fixed are fixed by welding or bolt-nut tightening, and the component members that are detachable from each other and can be relatively positioned are fixed by bolt-nut tightening. Note that illustration of some fixing means is omitted.

  The rail receiving member 2 is fixed to the inner surface 25a of the end plate 25. The rail receiving member 2 has a U-shaped cross section as illustrated in FIG. 4, and extends in the front-rear direction as illustrated in FIGS. 2 and 3. The outer surface of the closed side of the U-shaped cross section of the rail receiving member 2 contacts the inner surface 25 a of the end plate 25. Further, the rail member 3 is attached from the side surface of the rail receiving member 2 where the U-shaped cross section is open.

  The rail receiving member 2 is fixed to the end plate 25 by a pair of adjusting bolts 12a and 12b extending in the vertical direction. On the upper surface of the rail receiving member 2, the lower ends of the adjusting bolts 12a and 12b are fixed. The adjusting bolts 12a and 12b are screwed and penetrated to the fixing nuts 12c and 12d at appropriate intermediate positions in the axial direction. The fixing nuts 12 c and 12 d are fixed to the inner surface 25 a of the end plate 25. Adjustment nuts 12e and 12f are screwed onto the adjusting bolts 12a and 12b above the fixing nuts 12c and 12d. The adjustment bolts 12a and 12b can be moved in the vertical direction by rotating the adjustment nuts 12e and 12f. Thereby, the vertical position of the rail receiving member 2 can be adjusted. The vertical position of the screw blade 6a and the auxiliary screw blade 6b is determined by the position of the rail receiving member 2 in the vertical direction.

  Further, a pair of guide bars 13 a and 13 b are fixed to the upper surface of the rail receiving member 2 in a direction perpendicular to the front-rear direction. These guide rods 13a and 13b are inserted into a pair of guide holes 25c and 25d formed in the end plate 25, respectively. The guide holes 25c and 25d are formed as slits extending in the vertical direction. When the guide rods 13a and 13b move along the guide holes 25c and 25d, the rail receiving member 2 accurately moves in the vertical direction.

  The rail member 3 has an H-shaped cross section as illustrated in FIG. 4, and extends in the front-rear direction as illustrated in FIGS. 2 and 3. One flat surface of the H-shaped cross section of the rail member 3 and the inner surface of the closed side surface of the U-shaped cross section of the rail receiving member 2 have substantially the same width, and are in contact with each other and fixed. The position of the rail member 3 in the front-rear direction with respect to the rail receiving member 2 can be adjusted. For this purpose, the rail receiving member 2 is provided with rail guides 2a and 2b composed of a pair of upper and lower protrusions (see FIGS. 2 and 4A). The rail member 3 is movable in the front-rear direction along a groove formed by the rail guides 2a and 2b. After appropriately determining the position of the rail member 3 in the front-rear direction, the rail member 3 is fixed to the rail receiving member 2 and the end plate 25. This fixing is performed by rail fixing bolts 3a and 3b and a rail fixing nut 3c (see FIGS. 2 and 4A). The position of the screw blade 6a and the auxiliary screw blade 6b in the front-rear direction is determined by the position of the rail member 3 in the front-rear direction.

  As described above, the positions of the screw blade 6a and the auxiliary screw blade 6b in the front-rear direction and the up-down direction can be adjusted so that the mixture can be efficiently transferred.

  The configuration of the support member that supports the screw blades is not limited to the illustrated example, and various forms are conceivable. Further, the configuration for adjusting the position of the screw blades in the vertical direction and the front-rear direction may be any configuration as long as the position of the screw shaft 7 can be adjusted.

  FIG. 5 is a schematic view of an attaching process when attaching the side screw device 1 to the end plate 25, and is a view seen from the front side.

  The side screw device 1 is attached before the end plate 25 is attached to the side screed. First, the rail receiving member 2 is attached to the end plate 25. The adjustment bolt 12b of the rail receiving member 2 is screwed into the fixing nut 12d of the end plate 25. Next, the adjustment nut 12f is rotated (the other adjustment nut is also rotated uniformly) to appropriately adjust the vertical position of the adjustment bolt 12b. Thereby, the vertical position of the rail receiving member 2 is determined.

  On the other hand, components (screw blade, auxiliary screw blade, coupling, hydraulic motor, screw shaft, screw bearing member, suspension member, coupling support plate, and motor support plate) other than the rail receiving member 2 are assembled into the rail member 3. Install and fix.

  The rail member 3 is inserted from one end so as to be fitted into a groove formed by the rail guides 2a and 2b of the rail receiving member 2. Next, after appropriately adjusting the position of the rail member 3 in the front-rear direction with respect to the rail receiving member 2, the rail member 3 is attached to the rail receiving member 2 and the end plate 25 using the rail fixing bolt 3 b and the rail fixing nut 3 c. Fix it.

  Thereafter, the end plate 25 is attached to the side screed. Further, a hydraulic hose is connected to the hydraulic motor 9.

DESCRIPTION OF SYMBOLS 1 Side screw apparatus 2 Rail receiving member 2a, 2b Rail guide 3 Rail member 3a, 3b Rail fixing bolt 3c Rail fixing nut 4a, 4b Suspension member 4c Coupling support plate 4d Motor support plate 5a, 5b Screw bearing member 6a Screw blade 6b Auxiliary screw blade 7 Screw shaft 8 Coupling 9 Hydraulic motor 10 Hydraulic hose 11 Hydraulic controller 12a, 12b Adjustment bolt 12c, 12d Fixing nut 12e, 12f Adjustment nut 13a, 13b Guide rod 20 Asphalt finisher 21 Hopper 22 Conveyor 23 Left and right transfer screw Blade 24 Screed body 24a Central screed 24b Side screed 25 End plate 25a End plate inner surface 25b End plate outer surface 25c, 25d Guide 26 vehicle-body side wall 27 cab 100 asphalt pavers

Claims (8)

A side screw device (1) attached to an end plate (25) extending forward from a tip position of a side screed (24b) protruding in a lateral direction from a vehicle body side wall (26) of an asphalt finisher (20),
It is provided with screw blades (6a, 6b) that extend in the front-rear direction in the vicinity of the inner surface (25a) of the end plate (25) and are rotationally driven to transfer the mixture forward. Screw device. The side screw device according to claim 1, wherein the screw blade (6a, 6b) is installed at a predetermined position by being supported by a support member attached to the end plate (25).   The side screw device according to claim 2, wherein the support member has means for adjusting a position of the screw blade (6a, 6b) in the vertical direction.   The side screw device according to claim 2 or 3, wherein the support member has means for adjusting a position of the screw blade (6a, 6b) in the front-rear direction. The support member is
A rail receiving member (2) extending in the front-rear direction on the inner surface (25a) of the end plate (25) and fixed to the end plate (25);
A rail member (3) extending along the rail receiving member (2) and fixed to the rail receiving member (2);
Suspension members (4a, 4b) whose upper ends are fixed to the rail member (3);
A screw bearing member (5a, 5b) fixed to the lower end of the suspension member (4a, 4b) and rotatably supporting the screw shaft (7) which is the shaft of the screw blade (6a, 6b); The side screw device according to claim 2.   The side screw device according to claim 5, wherein a position for fixing the rail receiving member (2) to the end plate (25) can be adjusted in a vertical direction.   The side screw device according to claim 5 or 6, wherein a position for fixing the rail member (3) to the rail receiving member (2) can be adjusted in the front-rear direction. An asphalt finisher comprising the side screw device (1) according to any one of claims 1 to 7.

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