Asphalt finisher

Abstract

To provide an asphalt finisher capable of sufficiently securing compaction density of a paving material in the vicinity of a structure, a form or the like.SOLUTION: An asphalt finisher 1 is provided with a second tamper mechanism 50 protruding forward with a predetermined width at both ends in the vehicle width direction of a first tamper edge 38 included in a first tamper mechanism 35, and a second tamper edge 53 of the second tamper mechanism 50 is formed such that the lower surface rises forward, and a paving material can be tamped by the second tamper edge 53 before the paving material is tamped by the first tamper edge 38.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an asphalt finisher. [Background technology]

[0002] An asphalt finisher comprises a screed plate that vibrates slightly up and down to spread the paving material evenly, and a compaction device (tamper mechanism) that is positioned in front of the screed plate and vibrates up and down to compact the paving material. At the road surface construction site, one side edge in the width direction is surrounded by a structure, and the other side edge is surrounded by a wooden formwork or the like, and the paving material is poured between the structure and the formwork, the mixture is compacted with a tamper mechanism, and then spread evenly with a screed plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-090551 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with conventional asphalt finishers, there was a risk that the compaction density of the paving material near structures, formwork, etc. would be insufficient. Therefore, an object of the present invention is to provide an asphalt finisher that solves the above-mentioned conventional problems and can ensure sufficient compaction density of paving material near structures, formwork, etc. [Means for solving the problem]

[0005] The asphalt finisher of the present invention is an asphalt finisher equipped with a screed mechanism consisting of a screed plate that vibrates slightly up and down to spread the paving material, and a tamper mechanism that is arranged in front of the screed plate and vibrates up and down to compact the paving material, and is equipped with a second tamper mechanism that protrudes forward with a predetermined width at both ends of the vehicle width direction of a first tamper edge equipped in the tamper mechanism, and the second tamper edge of the second tamper mechanism has a lower surface that is formed upward toward the front, allowing the second tamper edge to compact the paving material before it is compacted by the first tamper edge. [Effects of the Invention]

[0006] The present invention can tamper with the paving material near structures, formwork, etc. with the second tamper edge in addition to the first tamper edge, thereby ensuring sufficient compaction density of the paving material near structures, formwork, etc. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a side view of an asphalt finisher. [Figure 2] FIG. 2 is a schematic diagram of the asphalt finisher as seen from above. [Figure 3] FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a schematic cross-sectional view seen from the VV direction in FIG. [Figure 6] FIG. 6 is a diagram showing a second tamper mechanism according to the first modification. [Figure 7] FIG. 7 is a diagram showing a protrusion according to the first modification. DETAILED DESCRIPTION OF THE INVENTION

[0008] Fig. 1 is a side view of an asphalt finisher 1 according to an embodiment of the present invention. Fig. 2 is a schematic view of the asphalt finisher 1 as seen from above. Fig. 3 is a schematic cross-sectional view as seen from the direction III-III in Fig. 2. The symbols FR, LH, and UP used in each drawing indicate the front, left, and upper sides, respectively. The asphalt finisher 1 includes a vehicle body 2, a hopper 3, and a screed mechanism 4.

[0009] The vehicle body 2 includes rear wheels 5 and front wheels 6. The motors (not shown) that drive the rear wheels 5 and the front wheels 6 are hydraulic motors that rotate when supplied with hydraulic oil from a hydraulic pump. The vehicle body 2 may include crawlers instead of the rear wheels 5 and the front wheels 6. The hopper 3 receives the paving material. The paving material is, for example, an asphalt mixture. The hopper 3 is installed at the front of the vehicle body 2 and is configured to be openable and closable in the vehicle width direction by a hopper cylinder 10. The asphalt finisher 1 receives the paving material from the bed of a dump truck (not shown) with the hopper 3 fully open.

[0010] The paving material fed to the rear side of the vehicle body 2 is spread in the vehicle width direction at the rear side of the vehicle body 2 and in front of the screed mechanism 4 by a screw spreader 15 provided to extend in the vehicle width direction of the vehicle body 2. In Figure 2, the paving material P spread by the screw spreader 15 is shown with a dotted pattern.

[0011] The leveling arm 7 is connected to the vehicle body 2 by a leveling cylinder 8 so as to move the screed mechanism 4 up and down. One end of the leveling arm 7 is connected to the screed mechanism 4, and the other end is connected to the vehicle body 2 so as to be rotatable. The leveling cylinder 8 is a hydraulic cylinder that moves the front end of the leveling arm 7 up and down to adjust the thickness of the paving material. When the thickness of the paving material is to be increased, the leveling cylinder 8 is contracted to raise the leveling arm 7. On the other hand, when the thickness of the paving material is to be decreased, the leveling cylinder 8 is extended to lower the leveling arm 7.

[0012] The screed mechanism 4 spreads and levels the paving material. The screed mechanism 4 is a floating screed towed by the vehicle body 2 and is connected to the vehicle body 2 via leveling arms 7. The screed mechanism 4 is moved up and down together with the leveling arms 7 by the extension and retraction of screed lift cylinders 9. A step 17 is provided on the rear side of the screed mechanism 4. The step 17 is a member that forms a foothold for a worker when working behind the screed mechanism 4.

[0013] As shown in FIG. 2, the screed mechanism 4 includes a central main screed 11 and telescopic screeds 12 provided on each side. The main screed 11 and the telescopic screed 12 each include a vibrator 13. The vibrator 13 is a vibration device for compacting the pavement surface. The vibrator 13 is an eccentric vibrator driven by a hydraulic motor. The vibrator 13 may be driven by an electric motor or may be a linear vibrator such as a piston vibrator. The left telescopic screed 12 is positioned forward of the right telescopic screed 12, but is not limited to this.

[0014] An extendable moldboard 14 is provided between the screw spreader 15 and the screed mechanism 4. The ends of the screed mechanism 4 and the extendable moldboard 14 in the vehicle width direction are attached to side plates 16. The extendable moldboard 14 is configured to be able to move up and down on the extendable screed 12 and the side plate 16. The extendable moldboard 14 is a member that adjusts the amount of paving material that remains in front of the extendable screed 12 out of the paving material spread by the screw spreader 15, and is configured to be able to extend and retract in the vehicle width direction together with the extendable screed 12.

[0015] Next, the configuration of the extendable screed 12 will be described in detail. Fig. 4 is a schematic cross-sectional view taken along the line IV-IV in Fig. 2. Fig. 5 is a schematic cross-sectional view taken along the line VV in Fig. 4.

[0016] Hereinafter, the internal configuration of the left telescopic screed 12 will be described, and since the interior of the right telescopic screed 12 is configured symmetrically to the left telescopic screed 12, the description of the right telescopic screed 12 will be omitted. As shown in Figure 3, the telescopic screed 12 includes a screed telescopic cylinder 18 and a pair of guide shafts 19 above and below the telescopic cylinder. By extending and retracting the screed telescopic cylinder 18, the telescopic screed 12 can be extended and retracted in the vehicle width direction.

[0017] The telescopic screed 12 has at its bottom a strike-off plate 30, a screed plate 31, and a first tamper mechanism 35 between the strike-off plate 30 and the screed plate 31. The strike-off plate 30, the screed plate 31, and the first tamper mechanism 35 are arranged across the entire width of the inside of the telescopic screed 12.

[0018] The telescopic screed 12 is provided at its front end with a deflector plate 32. The deflector plate 32 forms the front wall of the telescopic screed 12. The deflector plate 32 is connected to an internal plate 43 of the telescopic screed 12 by a fixing member (not shown). Fastening the fixing member tightens the strike-off plate 30, first tamper mechanism 35, and screed plate 31, respectively, reducing the gaps between the components.

[0019] The strike-off plate 30 adjusts the amount of paving material supplied to the first tamping mechanism 35, which is located behind the strike-off plate 30. The underside of the strike-off plate 30 has a slope that rises diagonally forward. The strike-off plate 30 is configured to allow adjustment of the angle at which it swallows the spread paving material and the distance between the bottom end of the strike-off plate 30 and the roadbed.

[0020] The screed plate 31 is supported by bolts 34 at the bottom of the screed body 33. A vibrator 13 is connected to the screed body 33. The screed plate 31 is vibrated slightly up and down by the vibrator 13 to spread and compact the paving material.

[0021] The first tamper mechanism 35 includes a tamper rotation shaft portion 36 , a first tamper rod portion 37 , a first tamper edge 38 , and a first tamper drive portion 39 .

[0022] The first tamper rod portion 37 is provided inside the extendable screed 12 and is fastened to an internal plate 43 extending in the vertical direction by a support portion (not shown) using a fastener. A tamper rotation shaft 36 that is rotationally driven by a first tamper drive unit 39 is inserted into the first tamper rod unit 37. The first tamper drive unit 39 is a hydraulic motor that rotates upon receiving a supply of hydraulic oil from a hydraulic pump (not shown). The first tamper drive unit 39 is located inside the extendable screed 12, at one end near the center of the vehicle body.

[0023] The tamper rotating shaft 36 is provided in a first eccentric hole 40 of the first tamper rod 37. As a result, the rotational motion of the tamper rotating shaft 36 is converted into the up and down reciprocating motion of the first tamper edge 38 via the first tamper rod 37. The first tamper mechanism 35 tampers the paving material that has been swallowed by the strike-off plate 30.

[0024] The first tamper edge 38 is formed at the lower end of the first arm portion 41 that extends downward from the first tamper rod portion 37. Like the strike-off plate 30, the first tamper edge 38 is formed across the entire width of the vehicle. The underside of the first tamper edge 38 has a first flat portion 38A on the rear side and a first inclined portion 38B on the front side. The underside of the first tamper edge 38 is formed to slope upward toward the front.

[0025] The first tamper mechanism 35 is configured so that when the first tamper edge 38 is in the highest position, the height of the front edge of the first inclined portion 38B is higher than the height of the rear edge of the strike-off plate 30. The first tamper mechanism 35 is configured so that when the first tamper edge 38 is in the lowest position, the height of the first flat portion 38A is higher than the height of the bottom surface of the screed plate 31.

[0026] 3 and 4, the screed mechanism 4 further includes a second tamper mechanism 50. The second tamper mechanism 50 includes a second tamper rod portion 52 and a second tamper edge 53.

[0027] The second tamper rod portion 52 is supported inside the telescoping screed 12 by a support portion 57 fastened to the inner plate 43 by a support portion bolt 58 . The tamper rotation shaft portion 36 is inserted into the second tamper rod portion 52. The second tamper rod portion 52 is provided on the tamper rotation shaft portion 36. That is, the first tamper mechanism 35 and the second tamper mechanism 50 share the tamper rotation shaft portion 36 as a rotation shaft.

[0028] A second eccentric hole 55 is formed in second tamper rod portion 52. Tamper rotation shaft portion 36 is inserted into second eccentric hole 55. Tamper rotation shaft portion 36 can be provided with respect to second eccentric hole 55 at a different phase from first eccentric hole 40 of first tamper rod portion 37.

[0029] When first eccentric hole 40 and second eccentric hole 55 are connected in the same phase with respect to tamper rotating shaft portion 36, first tamper edge 38 and second tamper edge 53 move up and down in the same manner. In other words, when first eccentric hole 40 and second eccentric hole 55 are in the same phase, second tamper edge 53 moves up and down so that when first tamper edge 38 is at its lowest position, second tamper edge 53 is at its lowest position, and when first tamper edge 38 is at its highest position, second tamper edge 53 is at its highest position.

[0030] When the first eccentric hole 40 and the second eccentric hole 55 are connected with respect to the tamper rotating shaft portion 36 in a phase difference of 180 degrees, the first tamper edge 38 and the second tamper edge 53 move up and down alternately. In other words, when the first eccentric hole 40 and the second eccentric hole 55 are in a phase difference of 180 degrees, the second tamper edge 53 moves up and down so that when the first tamper edge 38 is in the highest position, the second tamper edge 53 is in the lowest position, and when the first tamper edge 38 is in the lowest position, the second tamper edge 53 is in the highest position.

[0031] In this embodiment, the first eccentric hole 40 and the second eccentric hole 55 are connected in the same phase to the tamper rotating shaft 36. In other words, the first tamper mechanism 35 and the second tamper mechanism 50 move up and down in the same manner to tamp down the paving material.

[0032] The second tamper edge 53 is formed at the lower end of a second arm portion 56 that extends downward from the second tamper rod portion 52. The second arm portion 56 is formed so that the second tamper edge 53 is located in front of the first tamper edge 38.

[0033] The second tamper edge 53 is formed over a predetermined width from the inner surface of the side plate 16. The predetermined width is, for example, 200 mm. The lower surface of the second tamper edge 53 is formed with a second flat portion 53A on the rear side and a second inclined portion 53B on the front side. The lower surface of the second tamper edge 53 is formed to slope upward toward the front.

[0034] 4 and 5, a space portion 60 is formed in the strike-off plate 30 so that the position of the second tamper edge 53 of the second tamper rod portion 52 matches the shape of the underside of the second tamper edge 53. The space portion 60 is formed by cutting a part of the strike-off plate 30 into an L-shape to match the dimensions of the second tamper edge 53, which is formed in a rectangular shape. The dimension of the second tamper edge 53 in the front-rear direction is formed to be smaller than the dimension of the strike-off plate 30 in the front-rear direction. As a result, the strike-off plate 30 is also disposed in front of the second tamper edge 53.

[0035] Second tamper mechanism 50 is configured so that when second tamper edge 53 is in the highest position, the height of the front edge of second inclined portion 53B is higher than the height of the front edge of space portion 60 of strike-off plate 30. Second tamper mechanism 50 is configured so that when second tamper edge 53 is in the lowest position, the height of first flat portion 38A is higher than the height of the front edge of first inclined portion 38B when first tamper mechanism 35 is in the highest position.

[0036] [Effect, etc.] The asphalt finisher 1 equipped with the second tamper mechanism 50 is suitable for cases where there is a formwork or structure at the edge of the road surface to be paved. The structure may be, for example, a drainage ditch or the base of a curb. As shown in Figure 5, when a formwork 61 is installed at the edge of the road surface to be paved, the paving material near the side plate 16 may not be sufficiently compacted.

[0037] The paving material in a section R1, which is paved away from the formwork 61 at the road surface paving location, has accumulated paving material outside the section R1. Therefore, the paving material is sufficiently compacted by the first tamper mechanism 35 and screed plate 31. On the other hand, the paving material in the edge section R2, which is paved along the formwork 61, does not have much accumulated outside the edge section R2. Generally, the compaction density of the paving material, especially the shoulder portion, is likely to be low. In this embodiment, a second tamper edge 53 is provided at the right end of the right-side extendable screed 12 and the left end of the left-side extendable screed 12. The second tamper edge 53 is positioned forward of the first tamper edge 38 and adjacent to the side plate 16. As a result, the paving material in the edge section R2 is compacted not only by the first tamper edge 38 but also by the second tamper edge 53, thereby further compacting the paving material in a position along the formwork 61.

[0038] Additionally, the second tamper edge 53 is positioned higher than the first tamper edge 38. This allows the paving material that has been compacted by the second tamper edge 53 and reduced in thickness to be further compacted by the first tamper edge 38.

[0039] [Effects, etc.] As described above, the asphalt finisher 1 in this embodiment is equipped with a screed mechanism 4 consisting of a screed plate 31 that vibrates slightly up and down to spread the paving material, and a first tamper mechanism 35 that is arranged in front of the screed plate 31 and vibrates up and down to compact the paving material, and is equipped with second tamper mechanisms 50 that protrude forward with a predetermined width at both ends of the vehicle width direction of the first tamper edge 38 equipped on the first tamper mechanism 35, and the second tamper edge 53 of the second tamper mechanism 50 has a lower surface that is formed upward at the front, allowing the second tamper edge 53 to compact the paving material before it is compacted by the first tamper edge 38. With this configuration, paving material near structures, formwork, etc. can be poked with the second tamper edge 53 in addition to the first tamper edge 38. This ensures a sufficient compaction density of the paving material near structures, formwork, etc.

[0040] Furthermore, the height of the rear end edge of the second tamper edge 53 is greater than the height of the front end of the first tamper edge 38 . With this configuration, the paving material compacted by the second tamper edge 53 can be further compacted by the first tamper edge 38. This ensures a sufficient compaction density of the paving material near structures, formwork, etc.

[0041] The screed mechanism 4 is provided with a strike-off plate 30 in front of the first tamper mechanism 35 that adjusts the amount of paving material supplied, and the strike-off plate 30 has a space portion 60 formed in which the second tamper edge 53 fits. According to this configuration, the strike-off plate 30 is also disposed in front of the second tamper edge 53, thereby enabling adjustment of the supply amount of paving material to be compacted by the second tamper mechanism 50.

[0042] (Variation 1) FIG. 6 is a diagram showing a second tamper mechanism 150 according to the first modification. The second tamper mechanism 150 includes a second tamper rotation shaft portion 151, a second tamper rod portion 152, a second tamper edge 53, and a second tamper drive portion (not shown). A second tamper rotating shaft 151 that is rotationally driven by a second tamper drive unit is inserted into the second tamper rod unit 152. The second tamper drive unit is a hydraulic motor that rotates when supplied with hydraulic oil from a hydraulic pump (not shown).

[0043] The second tamper edge 53 is formed at the lower end of the second arm portion 156 that extends downward from the second tamper rod portion 152. The second arm portion 156 extends in a curved manner rearward from the second tamper rotation shaft portion 151, and the second tamper edge 53 is formed so as to be adjacent to the first tamper edge 38.

[0044] Second tamper rod portion 152 is positioned so that a portion of it protrudes from cutout portion 32A formed in deflector plate 32. Cutout portion 32A is formed to match the position of second tamper rod portion 152. Because paving material that has passed through extendable moldboard 14 accumulates in front of deflector plate 32, second tamper rod portion 152 is desirably positioned at a position higher than the height of the paving material.

[0045] Second tamper rotating shaft portion 151 is provided in second eccentric hole 55 of second tamper rod portion 152. As a result, the rotational motion of second tamper rotating shaft portion 151 is converted into up and down reciprocating motion of second tamper edge 53 via second tamper rod portion 152.

[0046] As described above, the first tamper mechanism 35 in variant example 1 comprises a tamper rotating shaft 36 and a first tamper rod 37 through which the tamper rotating shaft 36 is inserted and which vibrates together with the first tamper edge 38, the second tamper mechanism 150 comprises a second tamper rotating shaft 151 and a second tamper rod 152 through which the second tamper rotating shaft 151 is inserted and which vibrates together with the second tamper edge 53, and the screed mechanism 4 comprises a deflector plate 32 that forms the front wall, and a cutout portion 32A is formed in the deflector plate 32 so that the second tamper rod 152 is visible from the deflector plate 32. According to this configuration, the second tamper mechanism 150 can be added to an existing asphalt finisher that does not have the second tamper mechanism 150, and the asphalt finisher 1 can be configured simply. Furthermore, the cutout portion 32A is formed above the height of the paving material that is spread evenly on the extendable moldboard 14 and piles up in front of the deflector plate 32. This prevents the paving material from accumulating above the strike-off plate 30, the first tamper mechanism 35, the second tamper mechanism 150, and the screed plate 31.

[0047] (Variation 2) 7 is a diagram showing a protrusion according to Modification 2. First tamper edge 38 according to Modification 2 has protrusion 253 welded to its end in the vehicle width direction. The configuration of the underside of protrusion 253 is similar to the configuration of second tamper edge 53. Protrusion 253 corresponds to second tamper edge 53 located at the tip of second tamper mechanism 50 in embodiment 1 and Modification 1. In this modified example, the second tamper mechanism is made up solely of the protrusion 253. The protrusion 253 vibrates up and down together with the first tamper edge 38, and compacts the paving material with the protrusion 253 before the first tamper edge 38 compacts the paving material.

[0048] As described above, the second tamper mechanism is configured as a protrusion 253 provided on the front side of both ends of the first tamper edge 38 in the vehicle width direction, and the rear edge of the second flat portion 53A on the underside of the protrusion 253 is formed continuously with the front edge of the first inclined portion 38B on the underside of the first tamper edge 38. With this configuration, paving material near structures, formwork, etc. can be poked with the protrusion 253 in addition to the first tamper edge 38. This makes it possible to ensure a sufficient compaction density of the paving material near structures, formwork, etc. Furthermore, a second tamper mechanism can be configured for an existing asphalt finisher that does not have a second tamper mechanism simply by welding the protrusion 253 to the first tamper edge 38 of the first tamper mechanism 35 that the existing asphalt finisher is equipped with, making it possible to easily configure the asphalt finisher 1. [Explanation of symbols]

[0049] 1 Asphalt finisher 2. Body 3 Hopper 4 Screed mechanism 11 Main screed 12 Extendable screed 13 Vibrator 30 Strike-off Plate 31 Screed plate 32 Deflector plate 32A Notch 35 First Tamper Mechanism (Tamper Mechanism) 36 Tamper rotating shaft 37 First tamper rod part 38 First Tamper Edge (Tamper Edge) 38A 1st flat section 38B 1st slope part 50 Second Tamper Mechanism 52 Second tamper rod part 53 Second Tampa Edge 53A 2nd flat part 53B 2nd slope part 60 Space Section 61 Formwork R1 section R2 End Section 150 Second tamper mechanism according to modification 1 151 Second tamper rotating shaft 253 Protrusion

Claims

1. In an asphalt finisher equipped with a screed mechanism consisting of a screed plate that vibrates slightly up and down to spread the paving material, and a tamper mechanism that is arranged in front of the screed plate and vibrates up and down to compact the paving material, The tamper mechanism includes a first tamper edge, and a second tamper mechanism protruding forward with a predetermined width is provided at each end of the first tamper edge in the vehicle width direction. The second tamper edge of the second tamper mechanism has a lower surface that is formed upwardly toward the front, The second tamper edge can compact the paving material prior to compacting the paving material with the first tamper edge. Asphalt finisher.

2. a height of a rear end edge of the second tamper edge is greater than a height of a front end edge of the first tamper edge; The asphalt finisher according to claim 1 .

3. the tamper mechanism includes a tamper rotation shaft portion and a first tamper rod portion through which the tamper rotation shaft portion is inserted and which vibrates together with the first tamper edge, the second tamper mechanism includes a second tamper rod portion through which the tamper rotation shaft portion is inserted and which vibrates together with the second tamper edge, The asphalt finisher according to claim 1 .

4. the tamper mechanism includes a tamper rotation shaft portion and a first tamper rod portion through which the tamper rotation shaft portion is inserted and which vibrates together with the first tamper edge, the second tamper mechanism includes a second tamper rotation shaft portion and a second tamper rod portion through which the second tamper rotation shaft portion is inserted and which vibrates together with the second tamper edge, The screed mechanism includes a deflector plate that forms a front wall portion, a cutout portion is formed in the deflector plate so as to face the second tamper rod portion from the deflector plate; The asphalt finisher according to claim 1 .

5. The second tamper mechanism is configured as a protrusion provided on a front side of each end of the first tamper edge in a vehicle width direction, a rear end edge of a lower surface of the protrusion is formed continuously with a front end edge of a lower surface of the first tamper edge; The asphalt finisher according to claim 1 .

6. The screed mechanism includes a strike-off plate in front of the tamper mechanism for adjusting the amount of paving material supplied, The strike-off plate is formed with a space portion into which the second tamper edge fits. An asphalt finisher according to any one of claims 1 to 5.

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