JP3234504B2 - Prevention device for leveling material penetration in screed device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screed device for leveling a leveling material such as asphalt mixture in a road pavement / repair machine such as an asphalt finisher or a repeaver / remixer. The present invention relates to a leveling material intrusion prevention device.

[0002]

2. Description of the Related Art FIGS. 5 to 9 show a conventional example. FIGS. 5 and 6 show a hydraulic telescopic screed device (hereinafter referred to as an elastic screed) capable of arbitrarily changing the width of a pavement by using a hydraulic cylinder. 1 shows an asphalt finisher (hereinafter, referred to as a finisher) equipped with a telescopic unit widener device (hereinafter, referred to as a widener) which can arbitrarily change the width.

As an example, a description will be given of a work pattern until leveling of an asphalt mixture (hereinafter, referred to as a mixture) as a leveling material in the finisher. The work pattern is transported by a dump truck 1 and dropped onto a hopper 2 of the finisher. The mixed material 3 is sent to the rear of the finisher by the bar conveyor 4 and diffused in the left and right working width directions by the conveyor screw 5.

The mixture diffused in the width direction includes a main screed 6 mounted on the rear of the finisher, left and right expansion and contraction parts screeds 7 which expand and contract by a hydraulic cylinder in the left and right directions of the main screed 6, and A wide road width 8 and a pavement thickness 10 are formed by a widener 8 which is provided on the elastic portion screed 7 and extends and contracts with a hydraulic cylinder in the left-right direction to a wider member than the elastic portion screed 7.

As shown in FIGS. 6 and 7 (A), the front and rear of the main screed 6 are so arranged as to prevent a difference in the finished density in the transverse direction between the main screed side and the screed side. A telescopic part mixture gate 11 which expands and contracts in conjunction with the screed 7 is mounted, and furthermore, a telescopic part screed deflector located in front of the telescopic part screed 7
As shown in FIGS. 8 (A) and (B), a widener mixture gate 13 which expands and contracts in the left-right direction in conjunction with the widener 8 is slidably disposed on the front surface of the screed 7 and the expander screed 7 and the widener 8. Has the function of averaging a proper amount of the pool of the mixture material on the front surface of the.

As shown in FIGS. 7 (A) and 7 (B), in the current widener mounting machine, a shielding plate (thin plate) 16 is provided at the rear end of the main screed side cover 14 provided on the left and right sides of the main screed 6. The shield plate 16 allows the gap between the main screed side cover 14 and the widen
I try to get rid of 22.

[0007]

In the apparatus using the conventional shielding plate (thin plate) 16, as shown in FIGS. 8 (A) and 8 (B), a widener along the front surface of the screed deflector 12 is provided. Due to the arrangement of the composite material gate 13, particularly in the case of a screed device in which the maximum pave width is twice or more as large as the minimum pave width, the widener composite material gate 13 expands and contracts in conjunction with the widener 8 or the expansion / contraction screed 7 as the pavement width changes. to reason, when the elongation of the stretchable portion screed 7 and Waidona 8, a gap as shown in FIG. 7 (B) and FIG. 8 (B)
15 is generated, and there is a possibility that the mixture may enter the inside through the gap 15.

When the mixture enters through the gap 15, the mixture rolled on the flat paved surface paved by the main screed 6 is spread by the elastic screed 7 to roughen the paved surface. Will be impaired.

In order to prevent this, the shielding plate made of the thin plate is used.
As shown in FIG. 9 , a shield plate 17 such as an elastic rubber plate may be used instead of the rubber plate 16, but the rubber deteriorates due to the heat of the asphalt mixture, the pressing force is insufficient, and the wear due to frequent expansion and contraction operations. In addition, the gap 15 cannot be eliminated due to the damage and damage, and the invasion of the mixture cannot be prevented.

[0010] The present invention has been made in view of the above points, and effectively prevents the intrusion of the mixture into gaps that change with the extension operation of the screed device, and ensures the flatness of the pavement surface. The purpose is to do so.

[0011]

Means for Solving the Problems The invention described in 請 Motomeko 1 gap that varies with elongation operation of the screed unit
In the screed device to prevent the leveling material from entering the floor
This is a device for preventing entry of material to be laid,
The movable fixed leveling material intrusion prevention member
Comprising a gap adjusting mechanism to follow the variation between, to be laying leveling material intrusion prevention member, provided rotatably by a hinge disk
This is a leveling material intrusion prevention device in the lead device .

The gap adjusting mechanism prevents the leveling material from entering.
By moving the stop member to follow the change in the gap,
Is always closed to prevent the leveling material from entering the gap.
At this time, the gap is always closed by the rotation of the leveling member intrusion prevention member about the hinge.

[0013] The invention described in claim 2, to be laying leveling material intrusion preventing member of the insole leveling material intrusion preventing device in the screed apparatus of claim 1 Symbol <br/> mounting, the change in the gap by the spring Is to follow.

[0014] The biasing force of the spring causes the leveling member intrusion prevention member to follow the change in the gap.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, while an embodiment of the present invention with reference to FIGS. 1 and 2, also other embodiments of the present invention will be described with reference to FIGS. In addition,
The same parts as those in the conventional example shown in FIGS. 5 to 9 are denoted by the same reference numerals, and the parts are used and the description is omitted.

As shown in FIG. 1, between the main screed side cover 14 and the screed deflector 12
A gap adjusting mechanism 21 is provided.

The gap adjusting mechanism 21 is connected to the main screed side cover 14 which changes with the movement of the widener mix gate 13 during the extension operation of the screed device, that is, the extension operation of the widener 8 which is a part of the screed device. It is provided to prevent intrusion of asphalt mixture (hereinafter, referred to as mixture) as a leveling material from the gap 22 between the material gate 13 and the inside. It is formed in a hinge (hinge) structure.

That is, as shown in FIG.
A cover plate 24 as a fixed leveling material intrusion prevention member is rotatably attached to a support plate 23 fixed to the main screed side cover 14 by a shaft (long bolt) 25. A pair of upper and lower torsion coil springs (hereinafter, referred to as springs) 26, 27 fitted in the cylinder are urged clockwise in FIG.
It is in contact with the widener mixture gate 13.

The support plate 23 has a plurality of screw holes 32 corresponding to a plurality of screw insertion holes 31 formed in the rear end portion 14a of the main screed side cover 14, and passes through the washer 33 and the screw insertion hole 31. Screw 34 screwed into screw hole 32
As a result, the main screed side cover 14 is fixed to the rear end 14a. A pipe 35 is welded to the opposite end face of the support plate 23.

The cover plate 24 has a contact portion 36 formed by bending a rear end portion into an L-shape, and a pipe 35 at a front end side facing the support plate 23.
A pair of pipes 37 and 38 located on the upper side and the lower side are welded.

The arms 26 and 43 of the springs 26 and 27 project from the upper and lower ends of the coil 41, and the engaging portions 44 and 45 project from the tips of the arms 42 and 43, respectively. One of the engaging portions 44 is engaged with the inner surface of the cover plate 24, and the other engaging portion 45 is engaged with the inner surface of the support plate 23.

As shown in FIG. 2, the cover plate 24
The upper pipe 37, the upper spring 26, the pipe 35 of the support plate 23, the lower spring 27, and the lower pipe 38 of the cover plate 24 are arranged in series, and the shaft (long bolt) 25 is attached to these. Insert this shaft 25
A nut (46) is screwed into the threaded portion of (1), and a split pin (47) is inserted into a lateral hole of the shaft (25) to securely prevent the shaft (25) from being removed, thereby completing a hinge (hinge).

Then, as shown in FIG. 1B, the support plate 23 is fixed to the rear end portion 14a of the main screed side cover 14 by screws 34, and the cover plate 24 is engaged with the widener mixture gate 13. . At this time, since the cover plate 24 is rotated counterclockwise about the shaft 25, the springs 26 and 27 store a torsional restoring force in the clockwise direction.

Therefore, as shown by the two-dot chain line in FIG. 1B, when the widener mixture gate 13 extends outward and moves to a position where the gate 13 is pulled out from the cover plate 24,
Since the gap 22 between the main screed side cover 14 and the widener composite material gate 13 is enlarged and changed by the thickness of the widener composite material gate 13, so as to follow the change of the gap 22,
The cover plate 24 is rotated clockwise about the shaft 25 by the restoring force of the springs 26 and 27 and abuts on the screed deflector 12 at the expansion / contraction portion, and automatically responds to the expansion change of the gap 22.

In this way, the cover plate 24 is
22 is always closed to prevent the intrusion of the mixture 3 into the inside from the gap 22, which changes with the extension operation of the screed device.

A contact portion 36 formed by bending the cover plate 24 into an L-shape has a function of making the sliding of the widener mixture gate 13 smooth. That is, as shown in FIG. 1 (B), the contact portion 36 of the cover plate 24 makes line contact with the widener material mixture gate 13, and the one side portion 24a and the other side portion 24b via the contact portion 36 are connected to the widener composite material gate. Since both are inclined with respect to the material gate 13, smooth sliding in the forward and backward movements of the widener composite material gate 13 can be ensured.

Further, the gap adjusting mechanism 21 of this embodiment
Is composed of a support plate 23, a cover plate 24, a shaft 25, and the like made of metal such as iron, so that there is no problem of heat resistance as compared with the conventional rubber shielding plate 17 and the like. Because of the biasing force of the screed device and the expansion of the gap 22 due to the elongation operation of the gates, there is no problem of intrusion of the mixture due to insufficient pressing force as compared with the conventional rubber shielding plate 17, etc. Furthermore, there is no need to replace parts for wear or sagging due to frequent expansion and contraction of the screed device.

Next, other embodiments of the present invention will be described with various examples.

First , the clearance adjusting mechanism for causing the member for preventing leveling material intrusion to follow the change in clearance is not limited to a spring.

For example, by detecting the advance / retreat of the widener composite material gate 13 by a sensor and driving an electric or fluid pressure actuator, the mechanism for operating the member for preventing the spread of the material to be laid or the sliding shield plate is also adjusted. Included in the mechanism.

[0031] In addition, the hinge is spring to the shaft 25
It is not limited to those incorporating 26 and 27.

For example, as shown in FIG. 3, a spring mounting plate 51 is integrally protruded inward from the support plate 23, and a spring fitting rod 52 is attached to the spring mounting plate 51.
The compression coil spring 53 is fitted to the spring fitting rod 52, and the compression coil spring
At the end of 53, the receiving plate pivotally supported by the end of the cover plate 24
Engage 54. That is, the cover plate 24 may be biased clockwise by the compression coil spring 53 mounted inside the shaft 25.

Further, as shown in FIG. 4, a spring mounting plate 55 is integrally protruded from the support plate 23 to the outside, and the spring mounting plate 55 is protruded from the cover plate 24 to the outside.
56 are integrally formed, and a tension coil spring 57 is stretched between the two spring mounting plates 55 and 56. That is, the cover plate 24 may be biased clockwise by the tension coil spring 57 mounted on the outside of the shaft 25.

[0034] Also, the scan pulling the torsion coil springs 26 and 27, in addition to such as compression coil spring 53 or the tension coil spring 57, and an air spring formed by sealing the sealing body of telescopic air, the material itself Bellows-shaped ones that can use the restoring force are also included.

[0035]

Effects of the Invention] According to the invention 請 Motomeko 1, wherein variations of the gap
Prevention of penetration of fixed leveling material movably provided in the direction of formation
Make the member follow the change of the gap by the gap adjustment mechanism
Changes with the extension operation of the screed device.
Gap is automatically closed by the material entry prevention member
Effect that the leveling material may enter the inside from the gap
In particular, the hinge that closes the gap by the rotation of the leveling member intrusion prevention member can simplify the structure and installation, and prevent the leveling material from entering. The member can operate smoothly.

According to the second aspect of the present invention, the flattening member intrusion prevention member can reliably and automatically follow the change in the gap by the urging force of the spring having a simple structure.

[Brief description of the drawings]

FIG. 1A is an exploded perspective view showing a first embodiment of a spread material intrusion prevention device in a screed device according to the present invention, and FIG. 1B is a plan view showing its operation.

FIG. 2 is a front view showing a hinge structure of the intrusion prevention device.

FIG. 3 is a plan view showing a second embodiment of the intrusion prevention device;

FIG. 4 is a plan view showing a third embodiment of the intrusion prevention device.

5 is a side view of an asphalt finisher attached to the rear end of the dump truck.

FIG. 6 is a plan view of the same finisher.

FIG. 7A is a front view of a main screed side cover provided with a conventional shielding plate (thin plate) for preventing intrusion of a mixture,
(B) is a plan view of a gap formed in the shielding plate.

FIGS. 8A and 8B are explanatory diagrams showing expansion and contraction actions of a screed device and a widener mixture gate in an asphalt finisher, wherein FIG. 8A shows a contracted state, and FIG.

FIG. 9 is a plan view showing a conventional shielding plate (rubber plate) for preventing intrusion of a mixture.

[Explanation of symbols]

 3 Mixing material as a leveling material 21 Gap adjusting mechanism 22 Gap 24 Cover plate as a leveling material intrusion prevention member 26, 27 Spring 48 Hinge

Claims (2)

(57) [Claims] 1. Changes in accordance with extension of a screed device
Screed to prevent penetration of leveling material into gaps
A device for preventing the penetration of a material to be laid in a placement, wherein the material is a fixed-form material to be laid movably provided in a direction in which a gap changes.
A gap adjustment mechanism that allows the intrusion prevention member to follow changes in the gap
Provided by, the laying leveling material intrusion prevention member, the laying leveling material intrusion preventing device in the feature and be away Creed device that is provided rotatably by a hinge. 2. The flattening member intrusion prevention member is made to follow a change in a gap by a spring.
1 Symbol placing the insole leveling material intrusion preventing device in the screed apparatus.