JPS6340496Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to end plates that are attached to both ends of a screed device in an asphalt finisher and that regulate the casting width of asphalt mixture to form a paving end surface.

Prior Art As shown in FIGS. 5 and 6, recent asphalt finishers have a main screed 9 at the rear of the vehicle body 1 that corresponds to the standard pavement width. It is equipped with a telescopic screed device in which an extension screed 10 for expanding according to the width can be moved in the lateral direction (vehicle width direction) by a hydraulic cylinder 13 under the guidance of a guide bar 12. End plates 14 are disposed at both ends of the device for regulating the asphalt mixture spread by the screw conveyor 4 to a predetermined casting width to form pavement width end surfaces.

The conventional end plate 14 consists of a single plate,
The extension screed 10 is disposed between the end face of the extension screed 10 and a support frame 23 bolted to the screed 10 so as to be movable up and down with lateral movement restricted, and is attached to the support frame 23. It is suspended from a pair of front and rear height adjustment handles 24 via a chain 25 so that the height can be adjusted. Therefore, when changing the pavement width during paving work, especially when reducing the width, when the end plate 14 is moved inward together with the extension screed 10, the end plate 14 is moved inward as the asphalt mixture is drawn inward. However, if the amount of reduction to change the width is large, there will be no place for the asphalt mixture to escape.
There is a drawback that the resistance increases and the end plate 14 and its support frame 23 are deformed or damaged.

Purpose of the invention The purpose of the present invention is to provide a flexible end plate for an asphalt finisher that can solve the above-mentioned conventional problems and prevent deformation and damage of the end plate and its supporting member.

Structure of the invention The present invention consists of an end plate consisting of a front plate and a rear plate, and by connecting both plates with an elastic member, the front plate is always held at a specified position aligned with the rear plate. When an excessive load due to the asphalt mixture is applied to the front plate, the front plate can be displaced outward.

Embodiments Hereinafter, embodiments of the present invention will be specifically described with reference to FIGS. 1 to 4. As shown in Fig. 1, the asphalt finisher consists of a vehicle body 1 equipped with central driving functions such as a prime mover and a hydrostatic drive system, and a hopper 2 located at the front of the vehicle body 1 that temporarily stores asphalt mixture. , located at the bottom of the hopper 2,
A transport conveyor 3 for asphalt mixture extends to the rear of the vehicle body 1, a screw conveyor 4 rotatably attached to the rear of the vehicle body 1 and spreads the asphalt mixture in the width direction, and a screw conveyor 4 towed by the vehicle body 1. , and a screed device 5 that presses the asphalt mixture sent by the screw conveyor 4 onto the road, and one end of the screed device 5 is rotatably connected to both sides of the vehicle body 1 via pins 6. It is attached to the rear ends of a pair of left and right leveling arms 7 extending rearward, and its vertical position can be adjusted by a thickness control screw 8. In addition, the screed device 5
As shown in FIGS. 2 and 3, it consists of a main screed 9 and left and right extension screeds 10 disposed behind the main screed 9. It is attached to a bracket 11 protruding from the top so that it can slide laterally via a pair of upper and lower guide bars 12, and is moved by a pair of left and right hydraulic cylinders 13 (however, only one side is shown in the figure). ).

Next, the end plate 14, which is the main part of the present invention, will be explained with reference to FIGS. 2 to 4. Left and right (only one side is shown in the figure) end plates 14 for regulating the casting width of the asphalt mixture spread by the screed conveyor 4 are arranged at both ends of the extension screed 10, And it is divided into two in the front and back direction. That is, the end plate 14 is connected to the main screed 9 and the extension screed 10.
It is composed of a front plate 15 and a rear plate 16, each of which has a dividing surface at a portion corresponding to the boundary between the front plate 15 and the rear plate 16. Both plates 15 and 16 are hinged at 17
In addition to being rotatably connected around the vertical axis by the bolt 19 with a block 18 interposed so as not to interfere with the hinge 17 on the outer surface side.
They are connected by a pair of upper and lower leaf springs 20, which serve as elastic members, and are held so that they are always aligned on the same plane. Note that the bolt holes of the leaf springs 20 attached to the front plate 15 side are desirably elongated holes in order to facilitate elastic deformation of the leaf springs 20.

The end plate 14 configured as described above has a rear end portion of the rear plate 16 connected to the frame 21 of the extension screed 10, and
It is supported to be vertically movable with lateral movement restricted between it and a vertical portion 23a of a substantially hook-shaped support frame 23 which is secured by bolts 22 at appropriate intervals on the outside of the frame 21. , and the upper end of the front plate 10 is connected to the support frame 2.
It is suspended via a chain 25 by two height adjustment handles 24, front and rear, attached to the horizontal portion 23b of No. 3.

The asphalt finisher of this embodiment is configured as described above, and therefore, the left and right hydraulic cylinders 13 are operated to expand and contract depending on the width of the road to move the extension screed 10 outward or inward. By end plate 1
Asphalt paving work is carried out in a specified width regulated by 4, but when the screed equipment is reduced,
That is, when the end plate 14 is moved inward together with the extension screed 10,
Resistance from the asphalt mixture acts on the end plate 14. And end plate 1
4 and the end face of the main screed 9 is sufficiently wide, the outward load acting as resistance is not so large, and therefore, at this time, the front plate 15 of the end plate 14 resists the resistance of the leaf spring 20. By rear plate 1
6 is held in a specified position aligned with 6. However,
As the end plate 14 approaches the main screed 9 and the distance between them gradually narrows, and there is no place for the asphalt mixture to escape, the load increases and overcomes the leaf spring 20, and the front plate 15 moves as shown in FIGS. 2 and 4. As shown by the imaginary line, it is displaced outward with the hinge 17 as the center of rotation. That is, when the front plate 15 receives an excessive load that exceeds the resistance of the leaf spring 20 when the width of the screed device 5 is reduced, it escapes outward, thereby widening the escape area for the asphalt mixture.
In this state, if the paving work is continued with the dispersion of the asphalt mixture by the screw conveyor 4 temporarily stopped, the asphalt mixture between the front plate 15 and the main screed 9 will spread along the front plate 15. The front plate 15 is paved while being pushed forward, and when the load is reduced, the front plate 15 is returned to the specified position and held by the leaf spring 20.

In addition, when the front plate 15 escapes and is displaced, a tensile force is applied particularly to the front chain 25, so in reality, the entire end plate 14 tends to be displaced with its front side slightly floating.
In order to remove this, the horizontal portion 2 of the support frame 23
3b can be configured to be rotatable around the substantially same vertical axis as the front plate 15. In addition, a leaf spring 20 for holding the front plate
may be replaced with rubber.

Effects of the invention As detailed above, according to the invention, when an excessive outward load is applied to the front plate of the end plate when the width of the screed device is reduced, the front frame is moved outward and the asphalt mixture is By giving them a place to escape,
It is possible to protect the end plate and the frame supporting it by preventing the end plate from being deformed or damaged due to the excessive load.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of an asphalt finisher, Fig. 2 is a plan view showing an embodiment of the present invention, and Fig. 3 is a schematic side view of an asphalt finisher.
4 is a plan sectional view showing a connecting portion of the end plate, FIG. 5 is a plan view showing a conventional example, and FIG. 6 is a side view. 1...Vehicle body, 5...Screed device, 9...
...Main screed, 10...Extension screed, 14...End plate, 15...
Front plate, 16...Rear plate, 17
... Hinge, 20 ... Leaf spring, 23 ... Support frame.

Claims (1)

[Scope of utility model registration request] An extension screed is disposed behind the main screed so that it can move in the vehicle width direction, and an end plate at the outer end of the extension screed that regulates the width of the asphalt mixture is movable up and down. In the asphalt finisher equipped with the above-mentioned asphalt finisher, the end plate is composed of a front plate and a rear plate, and both plates are always held in a specified position where the front plate is aligned with the rear plate, and the asphalt composite material is used to A flexible end plate for an asphalt finisher, characterized in that the front plate is connected via an elastic member so as to allow the front plate to escape outward when an excessive load is applied.