scraper

Abstract

To improve the efficiency of work of peeling an asphalt layer from a paved road.SOLUTION: A scraper 10 comprises: a coupler 11, which is a member disposed at a tip edge 38 parallel to an oscillation support shaft 35 of a bucket 36, and which is detachable from the tip edge 38 in an opening edge 37 having a rectangular shape of the bucket 36 provided at a tip of a boom 31 of a power shovel 30 so as to be oscillatable; and a cutting blade 21 that can peel an asphalt layer A from a paved road R. When the cutting blade 21 in a state of peeling the asphalt layer A is viewed perpendicularly to the paved road R, the cutting blade 21 is directed obliquely relative to the tip edge 38.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a scraper for removing asphalt layers from pavement. [Background technology]

[0002] Patent Document 1 discloses a device capable of removing the asphalt layer of a pavement surface during renovation work on road pavement surfaces to address deterioration or to improve earthquake resistance. This device is equipped with multiple pins that are inserted into multiple holes formed in the area to be removed, and a moving means for moving the pin inserted into one hole toward or away from the pin inserted into the other hole. By moving these two pins toward or away from each other, the area between the two pins in the area to be removed is crushed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2005-067143 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned device is designed to finely crush the relatively narrow area between the two pins of the target area. The process of crushing a narrow area takes time, and the number of steps required to repeat the crushing process increases, resulting in poor work efficiency.

[0005] The scraper of the present disclosure was developed based on the above circumstances, and aims to improve the efficiency of the work of removing the asphalt layer from a paved road. [Means for solving the problem]

[0006] The scraper of the present disclosure comprises: A scraper is disposed on a tip edge of a rectangular opening edge of a bucket swingably provided at the tip of a boom of a power shovel, the tip edge being parallel to a swing support shaft of the bucket, a coupler detachable from the leading edge; a cutting blade capable of peeling off the asphalt layer of a paved road; When the cutting blade in the state of peeling off the asphalt layer is viewed perpendicularly to the paved road, the cutting blade faces in an oblique direction relative to the tip edge portion. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to improve the efficiency of the work of removing the asphalt layer from a paved road. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view showing a state in which a scraper is attached to the bucket of a power shovel and is peeling off an asphalt layer. [Figure 2] FIG. 2 is a partially enlarged cross-sectional view showing the state in which the asphalt layer is being peeled off by the scraper. [Figure 3] FIG. 3 is a front view showing the state in which the scraper is attached to the bucket adapter. [Figure 4] FIG. 4 is a rear view showing the scraper attached to the bucket adapter. [Figure 5] FIG. 5 is a right side view showing the scraper attached to the bucket adapter. [Figure 6] FIG. 6 is a left side view showing the scraper attached to the bucket adapter. [Figure 7] FIG. 7 is a cross-sectional view taken along line XX in FIG. [Figure 8] FIG. 8 is a plan view of the scraper in a state where it is peeling off an asphalt layer. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. Any combination of the following multiple embodiments within a range that does not cause contradictions is also included in the description of the present invention. The scraper of the present disclosure comprises: (1) A scraper is placed on the tip edge of the square opening edge of a bucket that is swingably mounted at the tip of a power shovel boom, the tip edge being parallel to the swing support axis of the bucket, and is equipped with a coupler that can be attached and detached to the tip edge and a cutting blade that can peel off the asphalt layer of a paved road, and when the cutting blade in a state of peeling off the asphalt layer is viewed perpendicular to the paved road, the cutting blade is oriented diagonally relative to the tip edge.

[0010] According to the configuration of the present disclosure, when an asphalt layer on a paved road is stripped using a cutting blade, the cutting blade is inserted into the asphalt layer and the bucket is moved in a direction perpendicular to the leading edge of the cutting blade. Using the scraper of the present disclosure, the asphalt layer can be stripped in fragments without being crushed into small pieces, thereby improving the efficiency of the work of stripping the asphalt layer on a paved road. Because the cutting blade is oriented diagonally relative to the direction of the scraper's movement, the fragments of the stripped asphalt layer slide diagonally along the inclination of the cutting blade and are pushed to the side of the scraper. This reduces the amount of asphalt layer fragments remaining on the scraper, thereby reducing the resistance acting on the scraper when stripping the asphalt layer.

[0011] (2) In (1), it is preferable that the coupler is attached to the bucket in a form that protrudes outward from the leading edge of the bucket, the cutting blade is formed on a cutting plate that is a separate part from the coupler, the cutting plate and the coupler are fixed by welding, and the cutting blade is positioned forward in the protruding direction of the protruding end of the coupler. With this configuration, pieces of the peeled asphalt layer can be moved to the side of the cutting plate without getting caught on the coupler.

[0012] (3) In (2), it is preferable that the protruding end of the coupler is disposed at a position closer to the cutting blade than the center of the cutting plate in a direction parallel to the protruding direction of the coupler. With this configuration, a large welding area can be secured between the coupler and the cutting plate, thereby preventing the coupler and the cutting plate from separating.

[0013] (4) In (1) to (3), the coupler is attached to the bucket in a manner that protrudes outward from the leading edge of the bucket, the cutting blade is formed on a cutting plate that is a separate component from the coupler, the cutting plate and the coupler are fixed by welding, and the welds between the cutting plate and the coupler are preferably arranged at multiple locations spaced apart in a direction parallel to the protruding direction of the coupler. With this configuration, when the cutting blade peels the asphalt layer, the cutting plate is deformed, albeit slightly, by a reaction force acting on the cutting plate from the asphalt layer. Here, since the welds between the cutting plate and the coupler are arranged at multiple locations spaced apart in the protruding direction of the coupler, stress generated at the welds can be reduced.

[0014] (5) In (4), it is preferable that a clearance be provided between the opposing surfaces of the cutting plate and the coupler in the region between the plurality of welds. With this configuration, when a reaction force acts on the cutting plate from the asphalt layer, the cutting plate can deform so as to advance into the clearance, thereby alleviating stress generated in the welds.

[0015] [Details of the embodiments of the present disclosure] [Example 1] A scraper 10 according to a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 8. The present invention is not limited to these examples, but is defined by the claims, and includes all modifications within the meaning and scope of the claims. In this first embodiment, the F direction in FIGS. 1, 2, and 5 to 8 is defined as the front. The H direction in FIGS. 1 to 7 is defined as the up. The R direction in FIGS. 3, 4, and 8 is defined as the right.

[0016] The scraper 10 of this first embodiment is a member attached to the bucket 36 of a power shovel 30 and used to peel off an asphalt layer A (surface layer or surface layer and base layer) of a paved road R from a roadbed B. As shown in FIG. 1 , the power shovel 30 has multiple booms 31 connected via swing shafts 32 in the left-right (horizontal) direction and swingable up and down or back and forth by hydraulic cylinders 33.

[0017] A bucket 36 is attached to the tip of the tip boom 31, which is farthest from the operator's seat 34, via a horizontal swing support shaft 35. The bucket 36 can be swung up and down and back and forth using a hydraulic cylinder 33, starting from the swing support shaft 35. Of the rectangular opening edge 37 of the bucket 36, the edge that is located farthest from the swing support shaft 35 and is parallel to the swing support shaft 35 is defined as a tip edge 38 (see Figure 2).

[0018] A plurality of protruding adapters 39 are provided at intervals in the left-right direction on the leading edge 38. The adapters 39 have mounting holes 40 formed therethrough. When the leading edge 38 faces left-right and the adapters 39 protrude downward from the leading edge 38, the mounting holes 40 penetrate the adapter 39 in the front-rear direction. A rubber pin 41 is fitted into the lower region of the mounting holes 40.

[0019] The scraper 10 is a member that can be attached to and detached from the adapter 39. Below, we will explain the scraper 10 in a state where the leading edge 38 of the bucket 36 faces left and right and the adapter 39 protrudes downward from the leading edge 38.

[0020] The scraper 10 is a member formed by welding together a metal coupler 11 and a metal cutting plate 20. The coupler 11 is a member manufactured as a single component by forging or casting, and includes a main body 12 and a pair of front and rear connecting protrusions 14. In a front view of the scraper 10, the main body 12 is rectangular in shape, with its vertical dimension being larger than its width (horizontal dimension). In a plan view of the scraper 10 from above, the front surface 11F and rear surface 11R of the main body 12 (coupler 11) are parallel to the leading edge 38. In a plan view, both left and right side surfaces 11S of the main body 12 (coupler 11) are perpendicular to the leading edge 38.

[0021] In a side view of the scraper 10 viewed from the side (right or left), the main body 12 has a triangular shape with the front-to-rear dimension gradually decreasing downward. In a side view, the front surface 11F of the main body 12 is inclined in an overhanging manner so as to extend diagonally rearward and downward from the upper end of the main body 12. In a side view, the rear surface 11R of the main body 12 is inclined in an overhanging manner so as to extend diagonally forward and downward from the upper end of the main body 12.

[0022] The main body 12 has a connecting hole 13 formed by recessing the top surface of the main body 12. In a plan view, the connecting hole 13 is rectangular. The connecting hole 13 and the adapter 39 are fitted together in a state where relative displacement in the front-to-rear and left-to-right directions is restricted. The portion of the adapter 39 into which the rubber pin 41 is fitted is housed within the connecting hole 13. The upper end region of the mounting hole 40 into which the rubber pin 41 is not fitted is located above the connecting hole 13 (main body 12).

[0023] The pair of front and rear connecting protrusions 14 are plate-shaped portions that protrude upward from the opening edges of the connecting holes 13 on the upper end surface of the main body 12. The front connecting protrusion 14 is connected to be flush with the front surface 11F of the main body 12. The rear connecting protrusion 14 is connected to be flush with the rear surface 11R of the main body 12. Each of the front and rear connecting protrusions 14 has a through hole 15 that penetrates each connecting protrusion 14 in the front-to-rear direction.

[0024] The region of the mounting hole 40 above the rubber pin 41 and the through hole 15 are positioned at the same position in the up-down and front-rear directions, and form a connecting hole 42 that penetrates the coupler 11 and the adapter 39 in the front-rear direction. A metal connecting pin 43 passes through the connecting hole 42 while the rubber pin 41 is elastically deformed. The connecting pin 43 is driven into the connecting hole 42 with a hammer (not shown). The connecting pin 43 is held in place in the connecting hole 42 by frictional resistance caused by the elastic restoring force of the elastically deformed rubber pin 41.

[0025] The cutting plate 20 is a member whose thickness direction is oriented in the front-to-rear direction. In a side view, the cutting plate 20 has a curved shape such that the front surface 20F bulges forward and the rear surface 20R is concave. The curvature of the cutting plate 20 is small, and the front surface 20F and the rear surface 20R of the cutting plate 20 are nearly flat. The thickness dimension of most of the cutting plate 20, excluding the upper and lower ends, is approximately constant. In a side view, the upper end of the cutting plate 20 has a shape in which the thickness gradually decreases upward, and the upper edge 20T is pointed.

[0026] The lower end of the cutting plate 20 has a shape in side view that gradually becomes thinner downward and has a pointed lower edge. The lower edge of the cutting plate 20 functions as a cutting blade 21 that bites into the asphalt layer A of the paved road R and peels the asphalt layer A from the roadbed B. In a plan view, the upper edge 20T of the cutting plate 20 and the cutting blade 21 are parallel. The cutting blade 21 is located behind the upper edge 20T of the cutting plate 20.

[0027] The coupler 11 and the cutting plate 20 are fixed together by arc welding or the like using a filler metal (not shown). In a plan view, the cutting plate 20 is located in front of the coupler 11. The coupler 11 is located in the center of the cutting plate 20 in the left-right direction. In the vertical direction (a direction parallel to the direction in which the coupler 11 protrudes from the leading edge 38 of the bucket 36), the lower end 11L (protruding end) of the coupler 11 is located below the vertical center 20C of the cutting plate 20. The upper edge 20T of the cutting plate 20 is located below the upper end of the main body 12 of the coupler 11.

[0028] As shown in Figure 8, in a plan view, the cutting plate 20 and cutting blade 21 are disposed in an inclined orientation with respect to the leading edge 38 of the bucket 36 in the left-right direction. The right end 21R of the cutting blade 21 is located rearward of the left end 21L of the cutting blade 21. Because the front face 11F of the coupler 11 (main body 12) is parallel to the leading edge 38 of the bucket 36, a clearance 27 is provided between the front face 11F of the coupler 11 (the face of the coupler 11 facing the cutting plate 20) and the rear face 20R of the cutting plate 20 (the face of the cutting plate 20 facing the coupler 11) (see Figure 7).

[0029] Two upper and lower welds 22, 23 are formed between the coupler 11 and the cutting plate 20 by solidifying a filler metal (not shown). The two welds 22, 23 are portions that firmly integrate the coupler 11 and the cutting plate 20. Of the two welds 22, 23, the upper weld 22 connects the upper end of the cutting plate 20 to the front surface 11F of the coupler 11. The upper weld 22 is formed only in the center of the coupler 11 in the left-right direction. The upper weld 22 is located higher than the lower weld 23.

[0030] The lower weld 23 is composed of a horizontal weld 24, a left weld 25, and a right weld 26. In a rear view of the scraper 10, the lower weld 23 is formed in a U-shape along the outer periphery of the coupler 11. The horizontal weld 24 connects the entire left-right area of ​​the lower edge of the coupler 11 to the rear surface 20R of the cutting plate 20. The left weld 25 connects the left edge of the coupler 11 to the rear surface 20R of the cutting plate 20. The formation area of ​​the left weld 25 in the up-down direction ranges from a position below the upper end of the main body 12 of the coupler 11 to the lower end 11L of the coupler 11. The right weld 26 connects the right edge of the coupler 11 to the rear surface 20R of the cutting plate 20. The formation region of right weld 26 in the vertical direction ranges from a position below the upper end of body 12 of coupler 11 to lower end 11L of coupler 11. The lower end of left weld 25 and the left end of horizontal weld 24 are connected to each other. The lower end of right weld 26 and the right end of horizontal weld 24 are connected to each other. Left weld 25 and right weld 26 are not connected to upper weld 22.

[0031] When peeling off the asphalt layer A of the pavement R, as shown in Figures 1 and 2, the scraper 10 protrudes downward from the leading edge 38 of the bucket 36, and the cutting blade 21 faces diagonally downward and rearward, with the cutting blade 21 biting into the asphalt layer A. Then, the bucket 36 and scraper 10 are moved rearward parallel to the pavement R. This action causes the asphalt layer A to be torn off from the roadbed B into pieces (not shown), which are then lifted up along the rear surface of the cutting plate 20. When the pavement R is viewed from above, the cutting blade 21 and the rear surface 20R of the cutting plate 20 are inclined left-right, which is perpendicular to the direction of movement of the bucket 36 (cutting blade 21). Therefore, the pieces of the torn off asphalt layer A move leftward due to the inclination of the rear surface 20R of the cutting plate 20. Therefore, there is no risk of fragments of the asphalt layer A accumulating on the rear surface 20R of the cutting plate 20, and the load on the scraper 10 caused by fragments of the asphalt layer A accumulating on the rear surface 20R of the cutting plate 20 is reduced.

[0032] The scraper 10 of the first embodiment is a component that is arranged on a leading edge 38 of a square opening edge 37 of a bucket 36 that is swingably mounted on the tip of a boom 31 of a power shovel 30, the leading edge 38 being parallel to the swing support shaft 35 of the bucket 36. The scraper 10 includes a coupler 11 that is detachable from the leading edge 38 of the bucket 36, and a cutting blade 21 that can peel off the asphalt layer A of the paved road R. When the cutting blade 21 in a state where it is peeling off the asphalt layer A is viewed perpendicular to the paved road R, the cutting blade 21 faces in an oblique direction relative to the leading edge 38 of the bucket 36. In a plan view of the cutting blade 21 in a state where it is peeling off the asphalt layer A, viewed perpendicular to the paved road R, the acute angle formed between the cutting blade 21 and the leading edge 38 of the bucket 36 is greater than 0° and less than 90°.

[0033] The scraper 10 of the first embodiment can peel off the asphalt layer A in relatively large pieces without crushing it into small pieces, thereby improving the efficiency of the work of peeling off the asphalt layer A from the paved road R. When the cutting blade 21 is oriented in a direction perpendicular to the movement direction of the bucket 36, fragments of the asphalt layer A accumulate behind the cutting blade 21 (the rear surface 20R of the cutting plate 20) as cutting progresses. As a result, the reaction force (resistance) acting on the cutting blade 21 from the fragments of the asphalt layer A increases, resulting in problems such as reduced workability and accelerated wear of the cutting blade 21. In contrast, in the scraper 10 of the first embodiment, the cutting blade 21 is oriented in a direction oblique to the direction perpendicular to the movement direction of the scraper 10, so the fragments of the peeled off asphalt layer A slide obliquely along the slope of the cutting plate 20 and the cutting blade 21 and are pushed out to the side of the scraper 10. This reduces the amount of fragments of the asphalt layer A remaining on the scraper 10 (rear surface 20R of the cutting plate 20), thereby reducing the resistance acting on the scraper 10 when peeling off the asphalt layer A.

[0034] The coupler 11 is attached to the bucket 36 in a form that protrudes outward (downward) from the leading edge 38 of the bucket 36. The cutting blade 21 is formed on a cutting plate 20, which is a separate component from the coupler 11. The cutting plate 20 and the coupler 11 are fixed together by welding. The cutting blade 21 is positioned below the lower end 11L (protruding end) of the coupler 11 (forward in the protruding direction of the coupler 11). With this configuration, pieces of the peeled asphalt layer A can be moved to the side of the cutting plate 20 without getting caught on the coupler 11.

[0035] The lower end 11L (protruding end) of the coupler 11 is disposed at a position closer to the cutting blade 21 than the center 20C of the cutting plate 20 (a position below the center 20C in the vertical direction of the cutting plate 20) in the vertical direction parallel to the protruding direction of the coupler 11. With this configuration, a large welding area can be secured between the coupler 11 and the cutting plate 20, and therefore separation between the coupler 11 and the cutting plate 20 can be prevented.

[0036] The welds 22, 23 between the cutting plate 20 and the coupler 11 are arranged at multiple locations (two locations) spaced apart in a direction (vertical direction) parallel to the protruding direction of the coupler 11. With this configuration, when the cutting blade 21 peels off the asphalt layer A, the cutting plate 20 is deformed, albeit slightly, to warp due to the reaction force acting on the cutting plate 20 from the asphalt layer A. Here, the upper welds 22 and the lower welds 23 that secure the cutting plate 20 to the coupler 11 are arranged at multiple locations (two locations) spaced apart in the vertical direction parallel to the protruding direction of the coupler 11, so that the stress generated in the welds 22, 23 can be reduced.

[0037] In the region between the upper weld 22 and the lower weld 23, a clearance 27 is secured between the opposing surfaces of the cutting plate 20 and the coupler 11 (between the rear surface 20R of the cutting plate 20 and the front surface 11F of the coupler 11). With this configuration, when a reaction force acts on the cutting plate 20 from the asphalt layer A, the cutting plate 20 can deform so as to advance into the clearance 27, thereby alleviating the stress generated in the upper weld 22 and the lower weld 23.

[0038] [Other Examples] The present invention is not limited to the examples described above and illustrated in the drawings, but is defined by the claims. The present invention includes the meaning equivalent to the claims and all modifications within the scope of the claims, including the following embodiments. The protruding end of the coupler may be located at the center of the cutting plate in the protruding direction of the coupler, or may be located at a position farther from the cutting blade than the center of the cutting plate. The entire area of ​​the weld may be continuous in the direction of protrusion of the coupler. In the region between the plurality of welds, the opposing surfaces of the cutting plate and the coupler may be in face-to-face contact with each other. The right end of the cutting blade may be located further forward than the left end of the cutting blade. The coupler may be disposed at a position offset to the right or left of the center of the cutting plate in the left-right direction. [Explanation of symbols]

[0039] 10...Scraper 11...Kapla 11F...Front of the coupler (the surface of the coupler facing the cutting plate) 11L...Lower end of coupler (protruding end of coupler) 20...Cutting board 20R... Rear surface of cutting plate (surface of cutting plate facing the coupler) 20C...Center of cutting plate in the direction of coupler protrusion 21...Cutting blade 22...Upper weld (weld) 23...Lower weld (weld) 27...Clearance 30...Power shovel 31...Boom 35...Swing support shaft 36...Bucket 37...Opening edge 38...Tilt edge of bucket A: Asphalt layer R...Paved road

Claims

1. A scraper is disposed on a tip edge of a rectangular opening of a bucket swingably provided at the tip of a boom of a power shovel, the tip edge being parallel to a swing support shaft of the bucket, a coupler detachable from the leading edge; a cutting plate having a cutting blade capable of peeling off the asphalt layer of the paved road; The linear lower edge of the cutting plate functions as the cutting blade, When the cutting blade is oriented along the asphalt layer to peel off the asphalt layer, the cutting blade faces diagonally relative to the tip edge when viewed perpendicular to the paved road.

2. the coupler is attached to the bucket in a manner that protrudes outward from the leading edge of the bucket, The cutting blade is formed on a cutting plate that is a separate component from the coupler, The cutting plate and the coupler are fixed together by welding, 2. The scraper according to claim 1, wherein the cutting blade is disposed forward of the protruding end of the coupler in the protruding direction.

3. 3. The scraper according to claim 2, wherein the protruding end of the coupler is disposed at a position closer to the cutting blade than the center of the cutting plate in a direction parallel to the protruding direction of the coupler.

4. the coupler is attached to the bucket in a manner that protrudes outward from the leading edge of the bucket, The cutting plate and the coupler are fixed together by welding, the welded portions between the cutting plate and the coupler are arranged at a plurality of locations spaced apart in a direction parallel to the protruding direction of the coupler, The welded portion is an upper welded portion that connects an upper end of the cutting plate and the coupler when the coupler is protruding downward; 4. The scraper according to claim 1, further comprising: a lower weld portion that is U-shaped and connects the outer peripheral edge of the downwardly protruding end of the coupler and the cutting blade, and that is not connected to the upper weld portion.

5. The scraper according to claim 4, wherein a clearance is ensured between opposing surfaces of the cutting plate and the coupler in the regions between the plurality of welded portions.

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