JP2011157749A - Screed unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screed unit which structurally shortens a distance from a main auger to an expansion screed to the utmost. <P>SOLUTION: The screed unit 10 is provided in the rear of a vehicle in a traveling direction; a screed comprises a main screed 20 and the expansion screeds 21R and 21L which are provided on the rear side of the main screed 20 to make an expansion/contraction motion in a horizontal direction; and a screw auger comprises the main auger 30 which is provided on the front side of the main screed 20, and expansion augers 31R and 31L which are housed in the main screed 20 to make an expansion/contraction motion in a horizontal direction through end surfaces 20R and 20L of the main screed 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  A technique relating to a screed device in a paving material leveling machine such as an asphalt finisher is disclosed below.

  For example, an asphalt finisher is well known as a machine for spreading and leveling an asphalt mixture that is a paving material in asphalt pavement construction. The asphalt finisher is a self-propelled leveling machine that includes a hopper in the forward direction of the vehicle and a screed device at the rear, and spreads the pavement material from the hopper to the rear while leveling with the screed device. The screed device is provided with a screw auger on the front side of the screed that spreads the pavement material fed from the hopper left and right with respect to the traveling direction (direction intersecting the traveling direction). Screed spreads the paving material that is spread evenly on the left and right.

  Many screed devices equipped with asphalt finishers have specifications that can change the leveling width (left-right width) of the screed. That is, it is a screed device including a main screed and a telescoping screed provided on the rear side of the main screed as disclosed in Patent Document 1. The main screed lies in the left-right direction behind the vehicle, and the total width of the screed is changed by the telescoping screed on the rear side of the main screed extending / contracting in the left-right direction (sliding in the left-right direction). In the screed device having a variable spread width, the screw auger has one main auger having an axial length substantially corresponding to the vehicle width, and has a telescopic auger on the left and right sides of the main auger. The telescopic screed can be expanded and contracted in the left-right direction. Therefore, the axial length (laying width) of the entire auger can be changed in accordance with the change in the spread width of the screed by the expansion and contraction operation of the extendable auger.

Japanese Utility Model Publication No. 04-092007

  In the screed device having the main screed and the left and right telescoping screeds as in the conventional screed device described above, when the telescoping screed is extended and installed, the amount of pavement material held in front of the screed is excessive. While being held, the temperature of the pavement will unnecessarily drop, affecting the finish.

  In the case of the conventional screed device, since the telescopic auger is installed in front of the main screed, the distance from the telescopic auger to the telescoping screed is increased by at least the distance between the main screed. That is, the space between the telescopic auger and the telescopic screed, that is, the front of the telescopic screed is widely open, and the amount of pavement material held here increases. As a result, the time from when the pavement material is spread with the extendable auger until the pavement material is spread with the extendable screed becomes longer, and the temperature of the pavement material tends to decrease. Furthermore, in the conventional screed device, since the telescopic auger is located on the rear side of the main auger, the distance between the main auger and the main screed is increased by the distance between the telescopic auger and the portion of the telescoping screed. If not, it can be said that there are many pavement materials held in front of the main screed.

  In view of the above background, a screed device having a structure in which the distance from the main auger to the telescoping screed is shortened as much as possible is required.

The screed device proposed for the above problem is a screed device that is provided at the rear of the vehicle in the traveling direction and spreads the pavement material with a screw auger and spreads with a screed,
The screed is configured to include a main screed and an extendable screed that is provided on the rear side of the main screed and expands and contracts in the left-right direction.
The screw auger includes a main auger provided on the front side of the main screed, and a telescopic auger housed inside the main screed and extending and contracting in the left-right direction through the end surface of the main screed.

  In the screed device according to the above proposal, since the telescopic auger is accommodated in the main screed, the position of the telescopic auger approaches the telescoping screed, and the space between the telescopic auger and the telescoping screed becomes narrow. Then, the total length of the screed device in the vehicle traveling direction is shortened by the amount of main auger-main screed-expandable screed. That is, the main auger and the main screed can be brought closer to each other because the telescopic auger is not positioned therebetween, and the distance from the main auger to the telescopic screed can be shortened.

  Therefore, the distance between the main auger and the main screed and between the telescopic auger and the telescoping screed is shortened, the amount of paving material held in front of the main screed and in front of the telescoping screed is reduced, and the spread of the paving material is unnecessary. It is possible to suppress a significant temperature drop.

The top view which shows embodiment of the screed apparatus with which the back of the asphalt finisher was equipped. The side view which shows embodiment of a screed apparatus. The front view which shows embodiment of a screed apparatus. The rear view which shows embodiment of a screed apparatus.

An embodiment of a screed device will be described with reference to FIGS.
A hopper 2 is provided in front of the traveling direction of the vehicle 1, and a paving material such as a goose asphalt mixture is supplied from the truck to the hopper 2. The pavement material supplied to the hopper 2 is fed backward from the lower part of the hopper 2 through the lower part of the vehicle 1 by the transport auger 3.

  The screed device 10 is provided at the rear of the vehicle 1 in the traveling direction, and spreads the pavement material sent out by the transport auger 3 with a screw auger and spreads out with a screed. The screed includes a main screed 20 and two left and right extendable screeds 21R and 21L, and the screw auger includes a main auger 30 and two left and right extendable augers 31R and 31L. In addition, although the example which is provided with two expansion-contraction screeds 21R and 21L and expansion-contraction augers 31R and 31L is shown in both right and left, it may be provided only in either one of left or right. In addition, hydraulic and mechanical actuators for driving each part of the screed device 10 are well-known techniques and can be appropriately implemented by those skilled in the art, and therefore are not shown.

  The main screed 20 has a prismatic shape lying in the left-right direction (direction intersecting the traveling direction) and has substantially the same width (length in the left-right direction) as the vehicle 1. The main screed 20 has a rectangular shape that is long in the left-right direction when viewed from above, and functions as a casing that can accommodate an object like a planter. In addition, the upper surface of the main screed 20 can cover a necessary portion with a step plate for an operator to get on during construction. In order to smoothly feed the paving material to the lower side of the main screed 20, a side plate 20 a whose lower part is inclined rearward is welded to the front side surface of the main screed 20 so as to cover the entire side surface. Further, the corners of the front and rear edge portions on the lower surface of the main screed 20 are rounded. Similarly, the corners of the front and rear edge portions on the lower surfaces of the expandable screeds 21R and 21L are also rounded.

  The main screed 20 is installed between a pair of support arms 1R and 1L extending rearward from the left and right sides of the vehicle 1 by a main frame 11 that is pivotally supported so as to swing in the vertical direction. The main frame 11 is suspended via hinges 13R and 13L between connecting arms 12R and 12L that are pivotally supported in the vertical direction with their front ends pivotally supported by the support arms 1R and 1L. The main frame 11 attached so as to be swingable by the hinges 13R and 13L is configured such that an attack angle with respect to the construction surface is turned by turning a height adjusting screw (not shown) provided between the connecting arms 12R and 12L and the main frame 11. (Inclination of the main frame 11) can be adjusted. Further, the clearance between the screed device 10 and the construction surface is adjusted according to the vertical movement of the connecting arms 12R and 12L. The main frame 11 includes end support plates 15R and 15L that are suspended from the left and right ends of the top plate 14 (shown by dotted lines), and two center support plates 16R and 16L that are disposed at the center of the top plate 14 and are arranged on the left and right. And having. The upper end portions of the left and right end face walls 20R, 20L of the main screed 20 are bolted to the front half portions of the end support plates 15R, 15L. The top plate 14 also has the purpose of covering the telescopic operation mechanism part, and the rear part is bent downward along the shape of the end support plates 15R and 15L to cover the back of the telescopic operation mechanism part (FIG. 4 is indicated by a dotted line).

  The telescoping screeds 21 </ b> R and 21 </ b> L are provided in parallel to the main screed 20 on the rear side of the main screed 20. The telescoping screeds 21 </ b> R and 21 </ b> L are rectangular pillars lying horizontally in the same manner as the main screed 20 and are rectangular in the left-right direction when viewed from above, and each has a width about half that of the main screed 20. The telescoping screeds 21R and 21L are respectively supported by two slide frames 22R and 22L that support the outer sides of the telescoping screeds 21R and 21L, and slide frames 23R and 23L that support the inner sides, and can extend and contract in the left-right direction ( (Elongation operation and contraction operation). The slide frames 22R, 22L, 23R, and 23L all suspend the telescoping screeds 21R and 21L via the height adjusting bolts 24, and the height adjusting bolts 24 are rotated to rotate the telescoping screeds 21R and 21L. The height can be finely adjusted. The height adjusting bolt 24 is screwed into bolt holes formed in the top plate portions 21Ra and 21La having an L-shaped cross section in the expandable screeds 21R and 21L.

  The slide frames 22R, 22L, 23R, and 23L are supported by the main frame 11 so as to be slidable in the left-right direction by two pipe frames 25R and 25L on each side. A total of four pipe frames 25R and 25L extending in the left-right direction are arranged in the front-rear direction alternately in parallel with each other. The right pipe frame 25R is supported by slide bearings provided on the end support plate 15R and the center support plate 16R of the main frame 11, and slides in the left-right direction through the end support plate 15R and the center support plate 16R. To do. The left pipe frame 25L is supported by slide bearings provided on the end support plate 15L and the center support plate 16L of the main frame 11, and penetrates the end support plate 15L and the center support plate 16L in the left-right direction. Slide to. The central support plates 16R and 16L are also provided with through holes for inserting the mating pipe frames 25R and 25L.

  The outer slide frames 22R and 22L located outside the main frame 11 are fixed to the outer ends of the pipe frames 25R and 25L, and the inner slide frames 23R and 23L located inside the main frame 11 are pipes. It is fixed to the middle part of the frames 25R and 25L. Therefore, the expandable screeds 21R, 21L supported by the slide frames 22R, 22L, 23R, 23L are slid in the left-right direction by the slide frames 22R, 22L, 23R, 23L fixed to the pipe frames 25R, 25L. Telescopic operation. The inner slide frames 23R, 23L are also provided with through holes for inserting the mating pipe frames 25R, 25L.

  End plates 26R, 26L are bolted to the end faces of the extendable screeds 21R, 21L. The side view of FIG. 2 is viewed with the end plate 26L removed, and in FIGS. 3 and 4, the end plates 26R and 26L are indicated by dotted lines.

  The main auger 30 is installed on the front side of the main screed 20 with the shaft end pivotally supported by bearing mechanisms 32R and 32L mounted on the partition plate 1a at the rear of the vehicle 1. A drive unit such as a motor is provided in either or both of the bearing mechanisms 32R and 32L, and the main auger 30 is rotated. The axis of the main auger 30 extends in the left-right direction and has an axial length that is substantially the same width as the vehicle 1. The blades around the axis of the main auger 30 have spiral directions opposite to each other at the center, and the paving material squeezed out from the transport auger 3 is spread evenly in the left-right direction.

  The telescopic augers 31R and 31L are housed and installed in the main screed 20 whose upper surface is open as described above. The main screed 20 extends and contracts in the left-right direction through the left and right end face walls 20R, 20L. For this purpose, U-shaped openings having a size corresponding to the diameter of the telescopic augers 31R and 31L are formed in the end face walls 20R and 20L of the main screed 20.

  The telescopic augers 31R, 31L are mounted on slide frames 22R, 22L, 23R, 23L to which the telescoping screeds 21R, 21L are mounted. That is, the slide frames 22R, 22L, 23R, and 23L connect the telescoping screeds 21R and 21L and the telescopic augers 31R and 31L, and extend and contract the telescopic augers 31R and 31L together with the telescoping screeds 21R and 21L. Specifically, the front end portions of the slide frames 22R, 22L, 23R, and 23L are extended to the position of the main screed 30, and the bearings are attached to the front end portions of the outer slide frames 22R and 22L located outside the main screed 20. The mechanisms 33R and 33L are suspended, and the bearing mechanisms 34R and 34L are suspended at the front end portions of the inner slide frames 23R and 23L located inside the main screed 20. The shaft ends of the telescopic augers 31R and 31L are pivotally supported by these bearing mechanisms 33R, 33L, 34R, and 34L. The inner bearing mechanisms 34R and 34L are provided with drive portions 35R and 35L such as motors, and the telescopic augers 31R and 31L are rotationally driven. The inner bearing mechanisms 34 </ b> R and 34 </ b> L and the drive units 35 </ b> R and 35 </ b> L are accommodated inside the main screed 20.

  The telescopic augers 31R and 31L extend together with the telescoping screeds 21R and 21L and project outward from the main screed 20 (widening), and contract with the telescoping screeds 21R and 21L to be accommodated in the main screed 20. (Reduced width). When the telescopic augers 31R and 31L are contracted, the contractive augers 31R and 31L rotate in the normal direction (rotation for sending the paving material outward). By accommodating the contracting augers 31R and 31L while rotating in the forward direction, the paving material does not need to enter the main screed 20.

  According to the screed device 10 having the above-described structure, the pavement material delivered from the front hopper 2 through the transport auger 3 is spread by the main auger 30 in the left-right direction, and is spread by the main screed 20 immediately after. Further, the pavement material spread by the main auger 30 and sent to the telescopic augers 31R and 31L is spread by the telescopic screeds 21R and 21L while being spread by the telescopic augers 31R and 31L.

  In this screed device 10, the telescopic augers 31R and 31L are accommodated in the main screed 20, and the telescoping screeds 21R and 21L are located immediately after the main screed 20, so that the positions of the telescopic augers 31R and 31L are larger than the conventional ones. The telescoping screed 21R, 21L is approaching. As a result, the space between the telescopic augers 31R and 31L and the telescopic screeds 21R and 21L is reduced, and the amount of paving material held in front of the telescopic screeds 21R and 21L can be reduced. Unnecessary temperature drop of the generated pavement material is suppressed.

  Further, since there is no need for a space for disposing the telescopic augers 31R and 31L between the main auger 30 and the main screed 20, the main auger 30 and the main screed 20 can be brought closer to each other. Accordingly, it is possible to reduce the amount of pavement material held in front of the main screed 20, and also in this portion, it is possible to suppress an unnecessary temperature drop of the spread pavement material.

  That is, the distance from the main auger 30 to the telescoping screeds 21R and 21L is as much as the space for disposing the telescopic augers 31R and 31L becomes unnecessary because the main screed 20 is configured to accommodate the telescopic augers 31R and 31L. And the overall length of the screed device 10 in the traveling direction is shortened. Therefore, the amount of pavement material to be held can be reduced both in front of the main screed 20 and in front of the telescoping screeds 21R and 21L, and unnecessary temperature reduction of the spread pavement material is suppressed. Further, since the screed device 10 is reduced in size, it is possible to obtain an advantage that the counterweight disposed at the front portion of the vehicle 1 is reduced. Furthermore, even when there is a machine width limitation during asphalt finisher transportation or a construction width change place during paving, it can be handled by expanding and contracting the extendable augers 31R and 31L, so there is no need to remove and extend the screw auger extension. It does not take.

DESCRIPTION OF SYMBOLS 1 Vehicle 1R, L Support arm 2 Hopper 3 Conveyor auger 10 Screed device 11 Main frame 12R, L Connection arm 13R, L Hinge 14 Top plate 15R, L End support plate 16R, L Center support plate 20 Main screed 21R, L Telescoping screed 21Ra, La Top plate 22R, L Slide frame (outside)
23R, L Slide frame (inside)
24 Height adjustment bolt 25R, L Pipe frame 26R, L End plate 30 Main auger 31R, L Extendable auger 32R, L Bearing mechanism (main auger)
33R, L Bearing mechanism (outside)
34R, L Bearing mechanism (inside)
35R, L drive unit

Claims (3)

A screed device that is provided at the rear of the vehicle in the traveling direction, spreads the pavement material with a screw auger and spreads with a screed,
The screed is
The main screed,
A telescoping screed that is provided on the rear side of the main screed and that expands and contracts in the left-right direction;
Comprising
The screw auger
A main auger provided on the front side of the main screed;
A telescopic auger housed inside the main screed and extending and contracting in the left-right direction through an end surface of the main screed;
A screed device comprising:   The screed device according to claim 1, further comprising a frame that connects the telescoping screed and the telescopic auger, wherein the telescoping screed and the telescopic auger operate to extend and contract together.   The screed device according to claim 1, wherein the telescopic auger rotates forward when the contraction operation is performed.

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