JP6411226B2 - Paving machine - Google Patents

Description

  The present invention relates to a paving machine having an extension step.

  When pavement work is performed using an asphalt finisher that is a paving machine, extension screeds (hereinafter sometimes referred to as EXT screeds) are attached to both ends of the vehicle body screed in the left-right direction of the vehicle so as to accommodate different work widths. The paving width is extended.

  A main body step is provided at the rear of the main body screed with respect to the vehicle traveling direction. Further, an extension step (hereinafter also referred to as an EXT step) is provided at the rear of the EXT screed in the vehicle traveling direction. The main body step and the EXT step are configured such that an operator can go back and forth between the steps. Therefore, the operator can perform work while viewing the pavement state by riding the main body step and the EXT step.

  Conventionally, the EXT step is separated from the main body step, and the EXT step is fixed to the EXT screed.

JP 2010-090599 A

  In order to attach the EXT step to the asphalt finisher, first, the EXT screed is attached to the main body screed, and then the EXT step is attached to the EXT screed using a bracket.

  When the EXT step is attached to the EXT screed, the EXT step and the main body step are separated and independent from each other, so that there is a possibility that a deviation occurs between the main body step and the EXT step.

  When the main body step and the EXT step are shifted and a step is generated, the operator needs to move while paying attention to the step when moving between the two steps, and the workability is deteriorated. In addition, when a deviation occurs between the main body step and the EXT step, it is disadvantageous in terms of design.

  One exemplary object of an aspect of the present invention is to provide a paving machine that prevents a deviation from occurring between the main body step and the extension step.

According to one aspect of the invention,
The main body screed,
An extension screed attached to the main body screed to extend the paving width;
A main body step for work provided behind the main body screed;
A paving machine having a working extension step provided behind the extension screed,
The extension step is fixed to the main body step and is configured to be displaceable with respect to the extension screed .

  According to an aspect of the present invention, it is possible to prevent a deviation from occurring between the main body step and the extension step.

FIG. 1 is a side view of a paving machine according to an embodiment. FIG. 2 is an enlarged perspective view showing an extension step of a paving machine according to an embodiment. FIG. 3 is an enlarged plan view showing an extension step of a paving machine according to an embodiment. FIG. 4 is an enlarged side view showing an extension step of a paving machine according to an embodiment. FIG. 5 is a cross-sectional view showing the internal structure of the extension step. FIG. 6 is a diagram for explaining the operation of the bracket and the extension step during the paving work.

  Reference will now be made to non-limiting exemplary embodiments of the invention with reference to the accompanying drawings.

  In the description of all attached drawings, the same or corresponding members or parts are denoted by the same or corresponding reference numerals, and redundant description is omitted. Also, the drawings are not intended to show relative ratios between members or parts unless otherwise specified. Accordingly, specific dimensions can be determined by one skilled in the art in light of the following non-limiting embodiments.

  In addition, the embodiments described below are examples, not limiting the invention, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 shows a paving machine that is an embodiment of the present invention. In the following description, the asphalt finisher 1 will be described as an example of a paving machine.

  The asphalt finisher includes a body frame 3, a vehicle body 5, a leveling arm 8, a screed 9, and a work step 16.

  The vehicle body frame 3 is supported by the front wheels 2A and the drive wheels 2B. The vehicle body frame 3 is provided with a vehicle main body 5, a hopper 6, a leveling arm 8, and the like.

  The vehicle main body 5 includes a power unit 4 that drives the drive wheels 2B. The drive wheel 2B is driven by the power unit 4, and the asphalt finisher 1 is configured to be able to run on its own. In addition, it is good also as a structure which makes the asphalt finisher 1 self-propelled by using a crawler instead of the front wheel 2A and the drive wheel 2B, and driving the crawler by the power unit 4.

  A driver's seat 11 having an operation device 10 is provided on the upper portion of the vehicle body 5. In addition, a hopper 6 is provided at a position in front of the vehicle body 5 above the body frame 3. The hopper 6 contains an asphalt mixture (see FIG. 6, sometimes referred to as a mixture 37 in the following description).

  Although not shown, the vehicle body 5 is provided with a conveyor for transporting the composite material 37 of the hopper 6 to the screed 9 side, and at the rear part of the vehicle body 5 the composite material 37 transported by the conveyor. Is provided in front of the screed 9 in the width direction of the vehicle body 5.

  The leveling arms 8 are respectively provided on both sides of the vehicle body 5. A front end portion of each leveling arm 8 is rotatably supported by the vehicle body 5. A screed 9 is connected to the rear end of the leveling arm 8. The leveling arm 8 can be moved up and down by a cylinder 18.

  The screed 9 spreads the composite material 37 and is provided with a heating device for heating the composite material 37. This heating device may be an electric heater or a gas burner. The screed 9 may be provided with a paving device such as a vibration device.

  By the way, the working width of the road on which paving is performed by the asphalt finisher 1 is various and not uniform. Therefore, the screed 9 may include a telescopic mechanism, and by changing the width of the screed 9 (the length in the left-right direction of the vehicle) by this telescopic mechanism, the screed 9 is configured to be able to cope with various work widths.

However, even if the screed 9 is extended to the longest by the telescopic mechanism, if the working width is longer than that, the extension screed 21 (hereinafter referred to as EXT) is attached to both ends of the screed 9 (both ends in the vehicle left-right direction). The screed 21 is sometimes attached.

  In the following description, the screed 9 attached to the vehicle main body 5 is referred to as a main body screed 20 (including the above-described expansion and contraction mechanism), and the main body screed 20 and the EXT screed 21 are collectively referred to. Sometimes referred to as screed 9.

  The asphalt finisher 1 performs a pavement operation on the pavement surface 12 while traveling forward (in the direction indicated by the arrow F in the figure). When performing this paving work, the mixed material 37 is thrown into the hopper 6, and this charged mixed material 37 is sent to the rear of the vehicle body 5 by a conveyor and is uniformly distributed in the width direction of the road by a screw auger. . The distributed mixture 37 is spread by the screed 9 and subjected to leveling work and compaction work, so that the paved surface 12 is finished smoothly.

  A work step 16 is provided at the rear of the screed 9 with respect to the vehicle traveling direction using a support bracket 17. The worker rides on the work step 16 during the pavement work and performs the pavement work while watching the pavement state.

  The work step 16 includes a main body step 22 and an extension step 23 (hereinafter sometimes referred to as an EXT step 23). The main body step 22 is fixed to the main body screed 20 using the main body side support bracket 27. Further, the main body step 22 includes an expansion / contraction step section that expands and contracts in conjunction with the expansion / contraction mechanism when the main body screed 20 includes the expansion / contraction mechanism. The EXT step 23 is fixed to the EXT screed 21 by using an extension side support bracket 28 (hereinafter sometimes referred to as an EXT side support bracket 28).

  In the following description, the main body step 22 and the EXT step 23 are collectively referred to as a work step 16, and the main body side support bracket 27 and the EXT side support bracket 28 are collectively referred to as a support bracket 17.

  2 and 3 show the screed 9 and the work step 16. FIG. 2 is an enlarged perspective view showing the screed 9 and the work step 16, and FIG. 3 is a plan view of the screed 9 and the work step 16.

  One end of the EXT screed 21 is attached to the main body screed 20 using a bolt 25 or the like. As a result, the working width can be increased by the length of the EXT screed 21. When the main body screed 20 is provided with an expansion / contraction mechanism, the EXT screed 21 is attached to the end of the expansion / contraction part (expandable screed) of the main body screed 20.

  The main body side support bracket 27 has a cantilever structure in which one end is fixed to the main body screed 20. When the main body screed 20 is provided with an expansion / contraction mechanism, the main body side support bracket 27 is fixed to an end portion of the expansion / contraction part (expandable screed) of the main body screed 20. Although only one main body side support bracket 27 is shown in FIGS. 2 and 3, a plurality of main body side support brackets 27 are provided so that the main body step 22 has a predetermined strength.

  A main body step 22 is supported on the other end of the main body side support bracket 27 via a vibration isolating rubber 26. In the case where the main body screed 20 includes an expansion / contraction mechanism, the expansion / contraction step portion of the main body step 22 is supported.

  The main body step 22 is formed by forming a metal flat plate member into a rectangular parallelepiped shape, and is disposed along the main body screed 20. When the main body screed 20 is provided with an expansion / contraction mechanism, an expansion / contraction step portion of the main body step 22 is further arranged along the expansion / contraction portion (expansion screed) of the main body screed 20. The main body step 22 is configured to be parallel to the main body screed 20 in a plan view (viewed from above), and to be substantially parallel to the pavement surface 12 in a side view (viewed from the side). ing. The relationship between the expansion / contraction step part of the main body step 22, the expansion / contraction part (expansion screed) of the main body screed 20, and the pavement surface 12 is also the same.

  The EXT-side support bracket 28 is provided in the vicinity of the other end of the EXT screed 21 (the outer end with respect to the vehicle left-right direction). Specifically, as shown in FIG. 4 in addition to FIGS. 2 and 3, an auxiliary bracket 41 is provided on the frame 40 of the EXT screed 21, and the EXT-side support bracket 28 uses bolts 42 on the auxiliary bracket 41. Fixed. In the present embodiment, the EXT screed 21 is provided with one EXT-side support bracket 28.

  The EXT step 23 is attached to the other end of the EXT side support bracket 28 (the end opposite to the side fixed to the EXT screed 21).

  In the EXT step 23, a metal flat plate member is formed in a rectangular parallelepiped shape, and a space portion is formed therein. The length of the EXT step 23 in the left-right direction of the vehicle (the length in the direction indicated by the arrow W in FIG. 2) is set to a length that reaches the main body side support bracket 27.

  The outer end of the main body step 22 in the left-right direction of the vehicle can be inserted into the inner end of the EXT step 23 in the left-right direction of the vehicle. Hereinafter, the portion where the main body step 22 is inserted into the EXT step 23 may be referred to as an insertion portion 22a.

  The insertion portion 22a and the EXT step 23 are fastened by a step fixing bolt 29. Thereby, the main body step 22 and the EXT step 23 are fixed, and the main body step 22 and the EXT step 23 are integrally connected.

  In a state in which the main body step 22 and the EXT step 23 are fixed, a small level difference of about the plate thickness of the EXT step 23 (about several millimeters) is formed at the connecting position of the main body step 22 and the EXT step 23. Only. Further, the linearity as a whole of the work step 16 (main body step 22 and EXT step 23) is improved.

  Therefore, when the worker moves between the main body step 22 and the EXT step 23, this minute step does not hinder the movement of the worker, and safety during work can be improved. Further, since a large step is not formed between the main body step 22 and the EXT step 23, the appearance of the work step 16 can be improved.

  The outer end portion of the main body step 22 is supported by the main body side support bracket 27, and the insertion portion 22 a at the outer end portion of the main body step 22 is connected to the EXT step 23. Therefore, the connection position with the main body step 22 is supported by the main body side support bracket 27.

  Thus, the main body side support bracket 27 functions as a bracket for supporting not only the main body step 22 but also the EXT step 23. For this reason, the total number of the support brackets 17 that support the work step 16 can be reduced, and the number of parts can be reduced.

  4 and 5 show an enlargement of the attachment position of the EXT step 23 to the EXT-side support bracket 28. FIG.

  The EXT step 23 is attached to the EXT-side support bracket 28 via a pair of vibration-proof rubbers 30. The anti-vibration rubber 30 is provided with a shaft 31 penetrating vertically in the center.

  Further, the shaft 31 is formed with a screw at a portion protruding upward from the anti-vibration rubber 30. A portion of the shaft 31 protruding above the vibration isolating rubber 30 is inserted into a hole formed in the bottom plate 23 a of the EXT step 23 and fixed to the bottom plate 23 a by a bolt 32. As a result, the vibration isolating rubber 30 is integrated with the EXT step 23.

  The lower portion of the shaft 31 is configured to protrude downward from the vibration isolating rubber 30. A spacer 33 is disposed on a portion of the shaft 31 that protrudes below the antivibration rubber 30.

  An insertion hole 35 is formed in the upper plate of the EXT-side support bracket 28 at a position corresponding to the position where the anti-vibration rubber 30 is disposed. The size of the insertion hole 35 is set to be larger than the diameter of the spacer 33.

  In a state where the EXT step 23 is attached to the EXT-side support bracket 28, the spacer 33 is located inside the insertion hole 35. Therefore, the spacer 33 is configured to be displaceable inside the insertion hole 35.

  When the spacer 33 is displaced in the insertion hole 35, the EXT step 23 is configured to be displaceable with respect to the EXT-side support bracket 28. That is, the EXT step 23 is configured to be displaceable in both the vehicle front-rear direction and the vehicle left-right direction (plane direction) with respect to the EXT-side support bracket 28.

  The reason why the EXT step 23 is configured to be displaceable with respect to the EXT side support bracket 28 will be described with reference to FIG.

  FIG. 6A shows the state of the screed 9 and the work step 16 before the pavement work is started (hereinafter referred to as a pre-work start state). In the state before the work is started, the asphalt finisher 1 is not running, and the composite material 37 is not sent to the work step 16. Therefore, as shown in FIG. 5 (A), the EXT screed 21 is not bent and is in a state of extending linearly in the vehicle left-right direction.

  On the other hand, FIG. 6B shows the state of the screed 9 performing the pavement work and the work step 16 (hereinafter referred to as work state). In the working state, the mixture 37 accommodated in the hopper 6 is conveyed to the front position of the main body screed 20 and the EXT screed 21 with respect to the vehicle traveling direction by a conveyor, a screw auger, or the like.

  The mixed material 37 thus conveyed is spread by the main body screed 20 and the EXT screed 21 as the vehicle main body 5 travels forward F. At this time, an external force is applied to the EXT screed 21 attached to the main body screed 20 to cause bending. A direction indicated by an arrow A in FIG. 6B indicates a direction of bending that occurs in the EXT screed 21.

  When the EXT screed 21 is bent, the EXT-side support bracket 28 fixed to the EXT screed 21 is also displaced from the position before the work is started.

  On the other hand, in this embodiment, the EXT step 23 is fixed to the main body step 22. For this reason, if the EXT step 23 and the EXT side support bracket 28 are fixed, stress may concentrate on the vibration isolating rubber 30.

  However, in this embodiment, since the spacer 33 fixed to the EXT step 23 is configured to be displaceable inside the insertion hole 35 formed in the EXT side support bracket 28, the EXT step 23 is supported by the EXT side support. The bracket 28 can be displaced with respect to the bracket 28.

  For this reason, even if the EXT screed 21 bends and the EXT side support bracket 28 is displaced from the pre-work start position, this displacement is absorbed by the spacer 33 being displaced inside the insertion hole 35. Therefore, even if the EXT screed 21 is bent in the working state, it is possible to prevent damage or the like from occurring at the fixed position between the EXT step 23 and the EXT side support bracket 28.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments described above, and various modifications are possible within the scope of the gist of the present invention described in the claims. It can be modified and changed.

  For example, in the above-described embodiment, the insertion portion 22a of the main body step 22 is inserted into the EXT step 23. However, a predetermined range on the inner side with respect to the vehicle left-right direction of the EXT step 23 may be inserted into the main body step 22.

DESCRIPTION OF SYMBOLS 1 Asphalt finisher 2A Front wheel 2B Drive wheel 3 Car body frame 4 Power unit 5 Vehicle main body 6 Hopper 8 Leveling arm 9 Screed 10 Operating device 11 Driver's seat 12 Pavement surface 16 Working step 17 Support bracket 20 Main body screed 21 Extension screed (EXT screed)
22 Main body step 22a Insert part 23 Extension step (EXT step)
24 Body fixing bracket 25 Bolt 27 Body side support bracket 28 Extension side support bracket (EXT side support bracket)
29 Step fixing bolt 30 Anti-vibration rubber 31 Shaft 32 Bolt 33 Spacer 35 Insertion hole 37 Compound material

Claims (4)

The main body screed,
An extension screed attached to the main body screed to extend the paving width;
A main body step for work provided behind the main body screed;
A paving machine having a working extension step provided behind the extension screed,
The paving machine , wherein the extension step is fixed to the main body step and is configured to be displaceable with respect to the extension screed . The pavement machine according to claim 1, wherein either the extension step or the main body step can be inserted into either the extension step or the main body step. The extension step is attached to a bracket provided on the extension screed,
The paving machine according to claim 1, wherein the extension step is configured to be displaceable with respect to the bracket. The main body screed has an expansion / contraction mechanism and the main body step has an expansion / contraction step part that expands and contracts in conjunction with the expansion / contraction mechanism of the main body screed,
The paving machine according to any one of claims 1 to 3, wherein the extension step is fixed to the expansion / contraction step part.

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