Plate Compactor

Abstract

To provide a plate compactor that makes an asphalt mixture hardly adhere to a rolling part and that can neatly finish a rolling object.SOLUTION: A plate compactor includes: a rolling part 2 that assumes a plate-like shape and that is brought into contact with a rolling object; a base part 3 that is provided in the rear of the rolling part 2 and in which a motor 4 is arranged; an excitation part 5 that is provided in the front part of the rolling part 2 and that can vibrate; a connection part 6 for rotatably connecting an output shaft 4a of the motor 4 and an excitation shaft 13 of the excitation part 5; and a handle 7 for being gripped by an operator. The rolling part 2 has a base plate part, and a heat storage part that is thickly formed on the base plate part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a plate compactor.

Background Art

[0002] For example, Patent Document 1 describes a plate compactor for compacting the edge of a pavement. The plate compactor includes a rolling part (rolling plate) that is plate-shaped and contacts the pavement, a base part where the prime mover is disposed, an oscillation part that can oscillate, a connecting part (belt) that rotatably connects the output shaft of the prime mover and the oscillation shaft of the oscillation part, and a handle that an operator grips. By traveling while vibrating the rolling part by the oscillation part, it is possible to compact a pavement formed of an asphalt mixture or the like. Since the plate compactor is highly maneuverable, it is often used in narrow places or places where appearance is important.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, the temperature of the uncompacted asphalt mixture is about 130°C. If the temperature difference between the rolling part of the plate compactor and the asphalt mixture is large, there is a problem that the asphalt mixture adheres to the lower surface of the rolling part and the surface of the pavement cannot be finished neatly. In order to solve such a problem, light oil or an anti-adhesion agent is applied to the lower surface of the rolling part, but the work becomes complicated and the construction cost also increases. In addition, when light oil or an anti-adhesion agent is applied, there is also a risk that the asphalt mixture will be denatured.

[0005] Therefore, an object of the present invention is to provide a plate compactor in which an asphalt mixture hardly adheres to the rolling part and the object to be rolled can be finished neatly.

Means for Solving the Problems

[0006] The plate compactor of the present invention has a plate shape, and includes a rolling part that contacts the object to be rolled, a base part provided at the rear part of the rolling part where a prime mover is arranged, an oscillating part that can oscillate provided at the front part of the rolling part, a connecting part that rotatably connects the output shaft of the prime mover and the oscillating shaft of the oscillating part, and a handle that an operator grips. The rolling part has a substrate part and a heat storage part formed thick with the same member as the substrate part on the substrate part. The heat storage part extends in the front-rear direction to approximately the center and in the width direction entirely and is characterized in that it is formed across.

[0007] According to the present invention, since the rolling part is provided with a heat storage part, the temperature of the rolling part is less likely to drop. As a result, the temperature difference between the asphalt mixture and the rolling part can be reduced, so that the asphalt mixture hardly adheres to the rolling part, and the object to be rolled can be finished neatly. In addition, by making a part of the rolling part thick, the strength of the rolling part can be increased and the service life can be extended. Also, a predetermined range in the front-rear direction from the rear part of the substrate portion is a location where the asphalt composite material particularly easily adheres to the lower surface of the rolling portion. According to the present invention, by providing a heat storage portion at this site, it is possible to further prevent the asphalt composite material from adhering to the lower surface of the rolling portion.

[0008] Further, it is preferable that the rolling part includes an edge part that inclines upward from the periphery of the substrate part. is This is preferable.

[0010] Further, the substrate part extends in a plate shape in the front-rear direction and rises with respect to the substrate part, and includes a pair of rising parts to which the base part is connected. The lower surface of the substrate part includes a tapered surface that inclines upward from the center side toward the left and right ends. It is preferable that the substrate part includes convex parts extending in the width direction at positions corresponding to the tapered surface, and the convex parts constitute a part of the heat storage part.

[0011] According to the present invention, by providing a tapered surface on the lower surface of the substrate portion, only the left and right ends become thin, but the thickness can be compensated by providing a convex portion on the substrate portion. Thereby, the balance of the heat storage portion can be adjusted.

Effects of the Invention

[0012] According to the plate compactor of the present invention, it is difficult for the asphalt mixture to adhere to the rolling portion, and the object to be rolled can be finished neatly.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Modes for Carrying Out the Invention

[0014] The plate compactor 1 according to an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, the plate compactor 1 of the present embodiment is a device that travels while vibrating on an object to be compacted to compact the object to be compacted. Examples of the object to be compacted include sand, gravel, crushed stone, soil, various paving materials, etc. Here, a case where the asphalt mixture forming the paving material is compacted will be exemplified. In the description, "up and down", "front and back", and "left and right" are based on the traveling direction of the plate compactor 1 and follow the arrows in FIG. 1 and the like. Further, the "width direction" is synonymous with the "left and right direction".

[0015] As shown in FIG. 1, the plate compactor 1 includes a compaction part 2, a base part 3, a prime mover 4, a vibration generating part 5, a connecting part 6, and a handle 7. The compaction part 2 is a plate-shaped part made of metal that contacts the asphalt mixture. The manufacturing method of the compaction part 2 is not particularly limited, but in the present embodiment, it is integrally formed by casting. The detailed structure of the compaction part 2 will be described later.

[0016] The base part 3 is a member that is connected above the rear part of the compaction part 2 and on which the prime mover 4 is arranged. As shown in FIGS. 1 and 2, the base part 3 includes an arrangement part 3a and side plate parts 3b, 3b. The arrangement part 3a is a flat plate-shaped part that extends substantially horizontally and on which the prime mover 4 is arranged. The side plate parts 3b, 3b are plate-shaped parts that extend downward from the left and right ends of the arrangement part 3a. The side plate parts 3b, 3b extend along the front-rear direction. The lower end parts of the side plate parts 3b, 3b are inclined so as to spread outward from each other as they go downward. The lower end part of the side plate part 3b is fastened to a rising part 33 (to be described later) of the compaction part 2 via an anti-vibration rubber (buffer member) 21.

[0017] The prime mover 4 is, for example, an engine or the like and is a drive source that generates power. The output shaft 4a of the prime mover 4 is arranged parallel to the left-right direction axis. A drive pulley 11 is attached to the end of the output shaft 4a of the prime mover 4.

[0018] As shown in FIGS. 1 and 3, the oscillation unit 5 includes an oscillation case 12, an oscillation shaft 13, and a driven pulley 14. As shown in FIG. 3, the oscillation case 12 is provided on the front portion of the substrate portion 31 and has a substantially cylindrical shape. The axis of the oscillation case 12 is arranged to be parallel to the left-right direction. The oscillation shaft 13 is arranged inside the oscillation case 12 to be parallel to the left-right direction as shown in FIG. 1. An eccentric weight is provided on the outer periphery of the oscillation shaft 13. Further, a driven pulley 14 is attached to the end of the oscillation shaft 13.

[0019] The connecting portion 6 is a member that rotatably connects the driving pulley 11 and the driven pulley 14. In this embodiment, the connecting portion 6 is an endless belt that is wound around the driving pulley 11 and the driven pulley 14. By the connecting portion 6, the rotational drive of the output shaft 4a is transmitted to the oscillation shaft 13, and the oscillation unit 5 can vibrate. A cover 18 for protecting the connecting portion 6 is provided outside the connecting portion 6. Note that although the belt is used for the connecting portion 6 in this embodiment, other forms may be used as long as it is a member or mechanism that rotatably connects the output shaft 4a of the prime mover 4 and the oscillation shaft 13 of the oscillation unit 5.

[0020] The handle 7 is a part that an operator grips and operates the traveling direction of the plate compactor 1. The base end portion of the handle 7 is connected to the rear portion of the base portion 3. The handle 7 can be tilted in the front-rear direction as shown by the virtual line in FIG. 1. Although the handle 7 is connected to the base portion 3 in this embodiment, it may be connected to the prime mover 4.

[0021] Further, a hook 8 that extends annularly from the front portion to the rear portion in the center in the left-right direction is provided on the base portion 3. The hook 8 has a rod shape. The hook 8 is a part that is hooked when lifting or suspending the plate compactor 1.

[0022] Next, the structure of the rolling part 2 will be described in detail. As shown in FIG. 3, the rolling part 2 includes a substrate part 31, an edge part 32, rising parts 33, 33, and a heat storage part (thick part 42 and convex parts 43). The substrate part 31 is plate-shaped, and its lower surface contacts the object to be rolled. The substrate part 31 is rectangular in this embodiment, but may have other shapes. The plate thickness of the substrate part 31 is 8 mm in this embodiment, but may be appropriately set in the range of 6 to 20 mm, for example.

[0023] The edge part 32 is a plate-shaped part that slopes outward upward from the peripheral edge of the substrate part 31. The edge part 32 includes a front edge part 32A formed on the front side, a rear edge part 32B formed on the rear side, a left edge part 32C formed on the left side, and a right edge part 32D formed on the right side.

[0024] The rising part 33 is a part that extends in a plate shape in the front-rear direction and rises from the substrate part 31. The rising parts 33, 33 extend from the oscillation case 12 formed on the front side toward the rear at equal intervals from each other. As shown in FIG. 2, the rising parts 33, 33 are inclined so as to approach each other upward. The side plate part 3b of the base part 3 and the rising part 33 are fastened with a bolt B1 and a nut N1 that sandwich and penetrate the vibration-proof rubber 21. In this embodiment, there are two fastening points on one side, but there may be one or three or more.

[0025] The heat storage part is a part formed thick on the substrate part 31. As shown in FIGS. 5 to 7, the heat storage part is composed of a thick part 42 and convex parts 43, 43 in this embodiment. As shown in FIG. 6, the thick part 42 is a part formed thick at the rear part of the upper surface of the substrate part 31. More specifically, the thick part 42 is formed in a predetermined range from the rear end of the substrate part 31 forward and across the entire width direction. The plate thickness of the heat storage part is 12 mm in this embodiment, but may be appropriately set in the range of 8 to 30 mm while considering the plate thickness of the substrate part 31.

[0026] As shown in FIG. 6, the rear part of the thick part 42 is a flat flat surface 42a, and the front part is an inclined surface 42b that slopes downward from the front end 42c of the flat surface 42a toward the front side. The thick part 42 extends forward from the rear end of the substrate part 31 or the vicinity thereof. The longitudinal length L1 of the thick part 42 in the front-rear direction may be set as appropriate. For example, it is preferably set to 20 to 100 mm, more preferably 30 to 60 mm. In this embodiment, the shape of the thick part 42 is as shown in FIG. 6, but it is not limited to this shape. For example, the side cross-section may be rectangular, triangular, semi-circular, or the like.

[0027] As shown in FIGS. 5, 7, and 8, the convex part 43 is a ridge part that extends outward in the left-right direction from the rising part 33 on the thick part 42. That is, the convex part 43 is formed from the rising part 33 to the left edge part 32C and from the rising part 33 to the right edge part 32D. The convex part 43 protrudes so that the upper surface is an arc (curved surface), but the side cross-section may be other shapes such as rectangular or triangular.

[0028] As shown in FIG. 10, on the lower surface of the substrate part 31, tapered surfaces 41a, 41a that slope upward from the center side toward the left and right ends are formed. The inclination angle (gradient) of the tapered surface 41a is about 1 to 10%, preferably about 2 to 5%. By providing the tapered surfaces 41a, 41a, it is possible to prevent the asphalt mixture from adhering to the left and right ends of the lower surface of the substrate part 31 and improve the rolling efficiency.

[0029] By providing the tapered surface 41a on the lower surface of the substrate part 31, only the left and right ends become thin, but by providing the convex part 43 on the substrate part 31, the thickness can be compensated. In this way, by providing the convex part 43, the heat storage balance of the heat storage part can be adjusted. In other words, the convex part 43 only needs to be formed so that the heat storage balance is adjusted. For example, it is preferable that the upper surface of the convex part 43 is formed to have the same inclination angle as the tapered surface 41a.

[0030] Also, when the height dimension from the lower surface (center of the lower surface) of the substrate portion 31 to the end portions in the left - right direction of the substrate portion 31 is h, the shape of the convex portion 43 may be determined so as to achieve a heat storage balance while considering the height dimension h. In this embodiment, the height dimension h is, for example, about 1 to 10 mm, more preferably about 2 to 5 mm. In this embodiment, the convex portion 43 is provided from the rising portion 33 to each edge portion 32, but it may be formed at a position corresponding to the tapered surface 41a. Incidentally, as shown in FIG. 9, the thickness of the front side (IX - IX cross - section in FIG. 4) of the substrate portion 31 is substantially constant across the width direction.

[0031] According to the plate compactor 1 according to the present embodiment described above, since the heat storage portion is provided in the rolling portion 2, the temperature of the rolling portion 2 is less likely to drop. That is, since the rolling portion 2 includes a portion having a larger thickness than the substrate portion 31, heat can be stored in the heat storage portion. As a result, the temperature difference between the asphalt mixture and the rolling portion 2 can be reduced, so that the asphalt mixture is less likely to adhere to the rolling portion 2. Therefore, the object to be rolled (asphalt mixture) can be finished neatly. For example, when the compaction work is once interrupted and then resumed, in this embodiment, since the temperature of the rolling portion 2 is kept high, it is difficult for the asphalt mixture to adhere to the lower surface of the rolling portion 2 even immediately after resumption.

[0032] Also, by providing the heat storage portion, a part of the rolling portion 2 becomes thick, so that the strength can be increased and the life of the rolling portion 2 can be extended. In addition, by providing the heat storage portion, the application work of light oil, an adhesion - preventing agent, etc. on the lower surface of the rolling portion 2 can be eliminated or the usage amount thereof can be reduced. Thereby, the work can be simplified and the construction cost can be reduced.

[0033] Here, the plate compactor 1 may float the front part of the lower surface of the rolling part 2 from the object to be rolled, and only bring the rear part of the lower surface into contact with the object to be rolled for construction. When compacting intensively or changing the traveling direction, etc., doing so makes the operation easier, and thus the number of times the front part of the rolling part 2 is floated from the object to be rolled increases. Therefore, a predetermined range in the front-rear direction from the rear end of the substrate part 31 is a location where the asphalt mixture particularly easily adheres to the lower surface of the substrate part 31.

[0034] In this regard, in the present embodiment, a heat storage part is formed in a predetermined range in the front-rear direction from the rear end or the vicinity (rear part) of the substrate part 31 and across the width direction. That is, by providing the heat storage part at a location where the asphalt mixture easily adheres, it is possible to further prevent the asphalt mixture from adhering to the rolling part 2. Also, since the front part of the rolling part 2 is floated, the rear part of the lower surface is likely to be worn down, but by making the rear part of the lower surface thick and providing the heat storage part, the life of the rolling part 2 can be extended.

[0035] Also, since the tapered surfaces 41a, 41a are provided, only the left and right ends of the rolling part 2 become thin, but by providing the convex part 43 on the substrate part 31 (on the thick part 42), the thickness can be compensated. Thereby, the heat storage balance of the heat storage part can be made uniform across the width direction or made closer to uniform. Also, since the tapered surfaces 41a, 41a are provided at the rear part of the lower surface of the rolling part 2, the asphalt mixture also easily adheres to this part, but by providing the convex part 43 at a position corresponding to the tapered surfaces 41a, 41a, it is possible to further prevent the asphalt mixture from adhering.

[0036] Also, the manufacturing method of the rolling part 2 is not limited, but for example, by casting using a mold, the degree of freedom in thickness can be increased, so the rolling part 2 can be easily manufactured.

[0037] Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, in this embodiment, the heat storage part is provided across the entire width direction at the rear part of the rolling part 2, but the heat storage part may be provided at a part other than the rear part, or may be provided locally in the rolling part 2. Further, when there is no tapered surface 41a, the convex part 43 may be omitted.

Example

[0038] Next, using examples and comparative examples, a temperature drop confirmation test and a temperature rise confirmation test were conducted. In the temperature drop confirmation test, after compacting the asphalt mixture using the plate compactor 1 according to the above-described embodiment and the plate compactor according to the comparative example, the rate of temperature decrease on the lower surface of the rolling part (rolling plate) was measured. The construction area was 50 mm 2 The outside air temperature was 11°C. As the asphalt mixture, a recycled dense-graded asphalt mixture was used. After the construction was completed, the examples and comparative examples were left on a road surface with a road surface temperature of 16°C, and the temperature on the lower surface of the rolling part was measured. The temperature was measured using thermography, and the average value of the lower surface of the rolling part was calculated.

[0039] The plate thickness of the rolling part of the plate compactor according to the comparative example was 8 mm (constant at 8 mm, without a heat storage part). The configuration of the plate compactor according to the comparative example was the same as that of the example except for the plate thickness of the rolling part. In both the comparative example and the example, the temperature on the lower surface of the rolling part immediately after the construction was about 80°C. Assuming that when the temperature on the lower surface of the rolling part drops below 50°C, the asphalt mixture easily adheres to the lower surface of the rolling part, the time taken for the temperature to drop from 80°C to 50°C was measured.

[0040] As shown in FIG. 11, in the case of the comparative example (dotted line), it took 7 minutes for the temperature on the lower surface of the rolling part to reach 50°C. On the other hand, in the case of the example (solid line), it took 20 minutes for the temperature on the lower surface of the rolling part to reach 50°C. That is, it was found that the temperature drop in the example was 1.47 times slower than that in the comparative example. Therefore, it was found that in the example, since heat can be stored in the heat storage part of the rolling part 2, it is difficult for the temperature on the lower surface of the rolling part 2 to drop.

[0041] This can reduce the temperature difference between the asphalt mixture and the lower surface of the rolling part 2, thus preventing the asphalt mixture from adhering to the lower surface of the rolling part 2. In addition, the preparation time when restarting the work can be shortened, and the use of an adhesion preventive agent or the like can be eliminated or the usage amount can be reduced.

[0042] In the temperature rise confirmation test, when compacting the asphalt mixture using the plate compactor 1 according to the above-described embodiment and the plate compactor according to the comparative example, the temperature rise condition of the lower surface of the rolling part (rolling plate) was measured. The plate compactors used in both the comparative example and the example are the same as those in the temperature drop confirmation test.

[0043] The asphalt mixture has a base layer of a coarse-grained asphalt mixture (maximum particle size 20 mm) and a surface layer of a recycled fine-grained asphalt mixture modified type 2 (maximum particle size 20 mm). The temperature of the asphalt mixture is about 120 to 130°C.

[0044] As shown in FIG. 12, in both the comparative example (dotted line) and the example (solid line), it generally took about 7 minutes for the temperature of the lower surface of the rolling part to reach 50°C. That is, although the rolling part 2 in the example is provided with a heat storage part, it does not have an adverse effect on the temperature rise of the rolling part 2, and it was almost the same as the temperature rise tendency of the comparative example (when there is no heat storage part). This is considered because although more heat is required in the example than in the comparative example, the amount of heat of the asphalt mixture is huge, so the difference in the temperature rise rate is small.

Explanation of Reference Numerals

[0045] 1 Plate compactor 2 Rolling part (rolling plate) 3 Base part 4 Prime mover 5 Vibration generating part 6 Connecting part (belt) 7 Handle 8 Hook 31 Substrate part 32 Edge part 33 Upright part 41a Tapered surface 42 Thick part 43 Protrusion

Claims

1. A compaction part that is plate-shaped and contacts the object to be rolled, A base part provided at the rear of the compaction part where a prime mover is arranged, An oscillation part provided at the front of the compaction part that can vibrate, A connecting part that rotatably connects the output shaft of the prime mover and the oscillation shaft of the oscillation part, A handle that an operator grips, and is provided with, The compaction part has a substrate part and a heat storage part formed of the same member as the substrate part and thick on the substrate part, The heat storage part is formed from the rear part of the substrate part to approximately the center in the front-rear direction and across the entire width direction. A plate compactor characterized by this.

2. The plate compactor according to claim 1, wherein the compaction part includes an edge part that inclines upward from the periphery of the substrate part.

3. The substrate part extends in a plate shape in the front-rear direction and has a pair of rising parts that rise with respect to the substrate part and to which the base part is connected, The lower surface of the substrate part has a tapered surface that inclines upward from the center side toward the left and right ends, The substrate part is provided with convex parts extending in the width direction at positions corresponding to the tapered surface, and the convex parts constitute a part of the heat storage part. The plate compactor according to claim 1 or claim 2, characterized by this.

Images