Construction machinery

Abstract

To provide a construction machine capable of carrying out work without lowering respective work efficiency even when carrying out different types of work.SOLUTION: A hydraulic shovel 1 is provided with: a machine body; a boom 31 and an arm 32 as arm members attached on the machine body; and a work device 13 having a bucket 33 as a work tool attached at a tip part of the arm 32, wherein the work device 13 is provided with: a scraping device 34 rotatable in a storage posture stored in a side part of the arm 32, and in a work posture positioned at a bucket 33 side at a tip of the arm 32; a hydraulic motor 4 as a driving member rotatably driving the scraping device 34 relating to the arm 32; and a lock member 5 locking the scraping device 34 in the storage posture.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a construction machine equipped with a scraping device.

Background Art

[0002] Construction machines such as hydraulic excavators can perform scraping operations, for example, using a scraping device to scrape out work objects deposited in narrow places, in addition to excavation operations for excavating earth and sand, minerals, etc. using a bucket.

[0003] For example, in Patent Document 1, a main body constituting an upper revolving body on a revolving frame installed via a revolving device on a lower traveling body, a four-link mechanism vertically movably attached to the revolving frame, a vertical revolving device attached to the movable side of the four-link mechanism, a multi-joint arm attached to the revolving part side of the vertical revolving device, and a scraping bucket rotatably attached to the tip of the multi-joint arm, having an excavation function and capable of accommodating scraped-out materials, are provided.

[0004] In this scraping working machine, the posture of the scraping bucket can be infinitely changed vertically and horizontally by the four-link mechanism, the vertical revolving device, and the multi-joint arm, and work can be performed in a suitable orientation adapted to the work place, so both excavation work and scraping work are realized with only one scraping bucket.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] ​However, in the scraping machine described in Patent Document 1, two different types of work, excavation and scraping, are performed with a single scraping bucket. Therefore, the scraping bucket needs to be configured to be usable in both operations. Consequently, the size of the scraping bucket is limited to a size that can be used for scraping, which is mainly performed in confined spaces. In this case, the amount of material that can be scooped into the scraping bucket during excavation is reduced, leading to decreased work efficiency.

[0007] The objective of the present invention is to provide a construction machine that can perform different types of tasks without reducing the efficiency of each task. [Means for solving the problem]

[0008] To achieve the above objective, the present invention provides a construction machine comprising a machine body and a work device having an arm member attached to the machine body and a work tool attached to the tip of the arm member, wherein the work device comprises a scraping device rotatable between a stored position in which the arm member is stored on the side and a working position in which the tip of the arm member is located on the work tool side, a drive member that drives the scraping device rotatably relative to the arm member, and a locking member that locks the scraping device in the stored position. The drive member is attached to the arm member, with the drive shaft extending toward the side of the arm member, and the locking member is provided on the side of the arm member and has a shaft portion extending along the axial direction of the drive shaft of the drive member, and a hydraulic cylinder that drives the shaft portion in its axial direction, and the scraping device has a rod-shaped rod portion with its base end attached to the drive shaft, a scraping portion provided at the tip of the rod portion in the extending direction for scraping out the work object, and an insertion hole formed therein through which the shaft portion is inserted and removed, protruding from the outer surface of the rod portion The hydraulic cylinder has an overhanging portion and rotates about the drive shaft to take on a retracted position in which the scraping portion is positioned on the base end side of the arm member and the rod portion extends along the arm member, and a working position in which the scraping portion is positioned on the side of the work tool and the rod portion extends towards the side of the work tool, wherein in the retracted position the overhanging portion extends upward along the side of the arm member and the rod of the hydraulic cylinder extends and the shaft portion is inserted into the insertion hole, thereby entering a locked state. It is characterized by the following: [Effects of the Invention]

[0009] According to the present invention, even when performing different types of tasks, the tasks can be performed without reducing the efficiency of each task. Other problems, configurations, and effects will be clarified by the following description of embodiments. [Brief explanation of the drawing]

[0010] [Figure 1] This is an external side view showing one example configuration of a hydraulic excavator according to an embodiment of the present invention. [Figure 2]It is a diagram showing how the scraping device operates between the storage position and the working position in the hydraulic excavator of FIG. 1. [Figure 3] It is a diagram showing an enlarged view of the scraping device in the storage posture and its peripheral part. [Figure 4] It is a diagram when viewing FIG. 3 from above. [Figure 5] It is a perspective view explaining the state a little before the scraping device reaches the storage posture. [Figure 6] It is a diagram when viewing FIG. 5 from the base end side of the arm. [Figure 7] It is a perspective view explaining the state when the scraping device is in the storage posture. [Figure 8] It is a diagram when viewing FIG. 7 from the base end side of the arm. [Figure 9] It is a diagram when viewing the lock member in the unlocked state from above. [Figure 10] It is a schematic diagram of the side cross section of the lock member in FIG. 9. [Figure 11] It is a diagram when viewing the lock member in the locked state from above. [Figure 12] It is a schematic diagram of the side cross section of the lock member in FIG. 11. [Figure 13] It is a schematic diagram showing a partial configuration example in the cab. [Figure 14] It is a flowchart showing a series of operation procedures from the start of use to the storage of the scraping device.

Mode for Carrying Out the Invention

[0011] Hereinafter, as an aspect of a construction machine according to an embodiment of the present invention, a crawler-type hydraulic excavator will be described.

[0012] <Overall Configuration of Hydraulic Excavator 1> First, the overall configuration of the hydraulic excavator 1 will be described with reference to FIGS. 1 and 2.

[0013] FIG. 1 is an external side view showing a configuration example of a hydraulic excavator 1 according to an embodiment of the present invention. FIG. 2 is a view showing a state in which the scraping device 34 operates between the storage position X and the working position Y in the hydraulic excavator 1 of FIG. 1.

[0014] The hydraulic excavator 1 includes a crawler-type traveling body 11 that can travel by itself, a revolving body 12 that is provided above the traveling body 11 so as to be rotatable, and a working device 13 that is attached to the revolving body 12 and performs various operations such as excavation and ground leveling.

[0015] The traveling body 11 includes a pair of crawlers 111 that extend in the traveling direction of the machine body, and a pair of traveling motors 112 that drive the pair of crawlers 111. By rotating the pair of crawlers 111 in contact with the ground by the driving force of the pair of traveling motors 112, the machine body is moved.

[0016] The pair of traveling motors 112 are mounted on the traveling body 11 corresponding to each of the pair of crawlers 111, and can drive the pair of crawlers 111 to rotate forward and backward independently by driving independently of each other. In FIGS. 1 and 2, only one of the pair of crawlers 111 is shown.

[0017] The revolving body 12 includes a revolving frame 21 serving as a base, a cab 22 on which an operator rides, a counterweight 23 that maintains the balance with the working device 13 so that the hydraulic excavator 1 does not tip over, and a machine room 24 that houses various devices for driving the hydraulic excavator 1 inside.

[0018] On the revolving frame 21, the cab 22 is placed at the front part, the counterweight 23 is placed at the rear end part, and the machine room 24 is placed between the cab 22 and the counterweight 23. Further, the working device 13 is attached to one side of the cab 22 at the front part of the revolving frame 21.

[0019] The working device 13 is hydraulically driven and comprises a boom 31 whose base end is rotatably attached to a slewing frame 21, an arm 32 rotatably attached to the tip of the boom 31, and a bucket 33 rotatably attached to the tip of the arm 32.

[0020] In this embodiment, the boom 31 and arm 32 are examples of an arm member attached to the machine body. However, the arm member does not necessarily have to be composed of two members; it may be composed of one member or a combination of three or more members.

[0021] The boom 31 is driven by the boom cylinder 31A shown in Figure 1. The boom cylinder 31A is connected at one end to the slewing frame 21 and at the other end to the boom 31, and the rod extends and retracts due to the inflow and outflow of hydraulic fluid, causing the boom 31 to rotate (elevate) vertically relative to the slewing body 12.

[0022] The arm 32 is driven by an arm cylinder (not shown in the figure). One end of the arm cylinder is connected to the boom 31, and the other end is connected to the arm 32. The rod extends and retracts due to the inflow and outflow of hydraulic fluid, causing the arm 32 to rotate in the front-rear direction relative to the boom 31.

[0023] The bucket 33 is driven by a bucket cylinder 33A (shown in Figures 3 and 4). One end of the bucket cylinder 33A is connected to the arm 32, and the rod side is connected to the bucket 33. The rod extends and retracts due to the inflow and outflow of hydraulic fluid, causing the bucket 33 to rotate in the front-rear direction relative to the arm 32.

[0024] Bucket 33 is a tool used to scoop up loads such as soil and sand, lower them to a designated location, and level the ground. Bucket 33 can be replaced with other tools, such as a grapple for gripping wood, rocks, or waste, or a breaker for excavating bedrock. This allows the hydraulic excavator 1 to perform various tasks, including excavation, leveling, and crushing, using tools appropriate to the task.

[0025] Furthermore, the hydraulic excavator 1 is equipped with a scraping device 34 for scraping operations, separate from the bucket 33. For example, when the hydraulic excavator 1 is performing the operation of lowering cargo from shelves in a ship's hold (shelf lowering operation), the bucket 33 is wide and may not be able to reach cargo located in narrow spaces, such as between multiple pillars. In this case, the hydraulic excavator 1 uses the scraping device 34 to scrape the cargo in the narrow space from the back to the front (towards the machine).

[0026] The scraping device 34 is rotatably attached to the arm 32 via a hydraulic motor 4, which acts as a drive member. When not in use, the scraping device 34 is stored on the left side of the arm 32 and locked by a locking member 5. When in use, the hydraulic motor 4 drives it from the storage position X, which is on the left side of the arm 32, to the working position Y, which is in front of the arm 32 (see Figure 2).

[0027] In this embodiment, the scraping device 34 has its left arm 32 in storage position X, but it is not limited to this, and depending on the specifications of the hydraulic excavator 1, the right arm 32 may also be in storage position X.

[0028] Thus, in the hydraulic excavator 1, since the scraping device 34 is provided on the side of the arm 32 in addition to the bucket 33, even when performing different types of operations in a series, such as excavation and loading using the bucket 33 and scraping using the scraping device 34, there is no need to replace the bucket 33 with the scraping device 34, thus saving the trouble of replacement work.

[0029] Furthermore, since the bucket 33 does not need to also function as a scraping device 34, it is possible to use a bucket 33 with specifications that allow for efficient excavation and loading operations, for example. Therefore, even when the hydraulic excavator 1 performs work using the bucket 33 and scraping work using the scraping device 34, it can perform the work without reducing the efficiency of each operation.

[0030] Furthermore, in this embodiment, the hydraulic excavator 1 is equipped with a display device 6 that indicates whether the scraping device 34 is in the retracted position (position at retracted position X). This allows the operator in the cab 22 to determine whether the scraping device 34 is in the retracted position by checking the display on the display device 6. The detailed configuration of the display device 6 will be described later.

[0031] <Configuration of the scraping device 34> Next, the specific configuration of the scraping device 34 will be explained with reference to Figures 3 to 8, in addition to Figure 2.

[0032] Figure 3 is a magnified view of the scraping device 34 and its surrounding area in its retracted position. Figure 4 is a view of Figure 3 from above. Figure 5 is a perspective view illustrating the state of the scraping device 34 just before it assumes the retracted position. Figure 6 is a view of Figure 5 from the base end side of the arm 32. Figure 7 is a perspective view illustrating the state of the scraping device 34 in its retracted position. Figure 8 is a view of Figure 7 from the base end side of the arm 32.

[0033] As shown in Figures 3 and 4, the scraping device 34 has a rod-shaped shaft portion 341 whose base end is attached to the hydraulic motor 4, and a spatula-shaped scraping portion 342 provided at the tip of the shaft portion 341 in the extension direction for scraping out the load, which is the object to be worked on.

[0034] As shown in Figure 4, the hydraulic motor 4 is fixed to the lower surface 321 of the arm 32 (the surface facing the ground when the arm 32 extends forward of the boom 31), and the drive shaft 40 extends in the width direction of the arm 32 and extends to the left side. The base end of the rod portion 341 is fixed to the extended end of this drive shaft 40. Therefore, the scraping device 34 is positioned at a predetermined distance W from the left side surface 322 of the arm 32, that is, without contacting the left side surface of the arm 32.

[0035] In the stowed position, as shown in Figures 2, 3, and 4, the scraping section 342 of the scraping device 34 is positioned on the base end side of the arm 32 and the rod section 341 extends along the arm 32. In the working position (position at working position Y), as shown in Figure 2, the scraping section 342 is positioned on the bucket 33 side and the rod section 341 extends towards the bucket 33.

[0036] As shown in Figure 2, the scraping device 34 rotates between the storage position X and the working position Y around the drive shaft 40 by the rotational driving force of the hydraulic motor 4. When the scraping device 34 rotates, the boom 31 is raised above the operator's cab 22 at its tip, the arm 32 is extended forward of the boom 31, and the bucket 33 is positioned in front of the arm 32 and above the scraping device 34 in its working position, so that the scraping device 34 does not collide with surrounding members or the ground of the machine. In this state, the scraping device 34 rotates in an arc below the arm 32.

[0037] When performing scraping operations, first the scraping device 34 is set to the working position, and then the scraping device 34 is operated by manipulating the boom 31 and arm 32. At this time, the bucket 33 is fixed in a position in front of the arm 32 and above the working position of the scraping device 34 so as not to come into contact with the scraping device 34 while it is in operation.

[0038] In this embodiment, as shown in Figures 2-4, the hydraulic motor 4 is positioned towards the tip (bucket 33 side) of the center in the extending direction of the arm 32, and the length of the shaft 341 (length from the hydraulic motor 4 to the scraping section 342) is set so that the scraping section 342 is positioned in front of the bucket 33 when the scraping device 34 is in the working position. In this case, when in the stowed position, the scraping section 342 is located at the base end of the arm 32 (the end opposite to the end to which the bucket 33 is attached). The length of the shaft 341 and the size of the scraping section 342 can be appropriately changed according to the specifications of the hydraulic excavator 1 and the working environment of the scraping site.

[0039] Furthermore, the rod portion 341 has an overhang portion 343 extending from its outer surface 341A at the end on the scraping portion 342 side. The overhang portion 343 is formed in a plate shape with thickness in the left-right direction of the machine (the width direction of the arm 32), and when the scraping device 34 is in the stowed position, it extends upward along the left side surface 322 of the arm 32, and when the scraping device 34 is in the working position, it extends downward (towards the ground surface of the machine). In other words, the overhang portion 343 extends in a direction that intersects (is perpendicular to) the extending direction of the arm 32 and the axial direction of the drive shaft 40 of the hydraulic motor 4.

[0040] As shown in Figure 5, the protruding portion 343 has a circular through-hole 343A that penetrates in the thickness direction, through which the shaft portion 51 of the locking member 5 (described later) is inserted and removed. When the shaft portion 51 is inserted through this through-hole 343A, the scraping device 34 is locked in the retracted position.

[0041] <Configuration of locking member 5 and locking mechanism> Next, the specific configuration and locking mechanism of the locking member 5 will be explained with reference to Figures 3 to 8, as well as Figures 9 to 12.

[0042] Figure 9 shows the locking member 5 in the unlocked state as viewed from above. Figure 10 is a schematic diagram of the side cross-section of the locking member 5 in Figure 9. Figure 11 shows the locking member 5 in the locked state as viewed from above. Figure 12 is a schematic diagram of the side cross-section of the locking member 5 in Figure 11.

[0043] As shown in Figures 3 and 4, the locking member 5 is provided on the left side of the arm 32 in which the scraping device 34 is stored. In this embodiment, the locking member 5 is provided protruding from the left side surface 322 at the base end of the arm 32, more specifically at a position opposite to the protruding portion 343 of the scraping device 34 in its stored position.

[0044] The locking member 5 includes a shaft portion 51 extending along the axial direction of the drive shaft 40 of the hydraulic motor 4, a hydraulic cylinder 52 that drives the shaft portion 51 in its axial direction, a bracket 53 provided at the base end of the shaft portion 51, a head 54 provided at the tip of the rod 520 of the hydraulic cylinder 52, and a frame 55 that houses the shaft portion 51, hydraulic cylinder 52, bracket 53, and head 54 inside and is attached to the left side surface 322 of the arm 32.

[0045] The shaft portion 51 is inserted into and removed from the insertion hole 343A formed in the protruding portion 343 of the scraping device 34 in accordance with the extension and retraction of the rod 520 of the hydraulic cylinder 52. More specifically, when the scraping device 34 is in the retracted position, the shaft portion 51 is inserted into the insertion hole 343A when the rod 520 of the hydraulic cylinder 52 extends (see Figure 8), and is removed from the insertion hole 343A when the rod 520 of the hydraulic cylinder 52 retracts.

[0046] As shown in Figures 9 to 12, the bracket 53 has a first plate portion 531 to which the base end of the shaft portion 51 is fixed, a second plate portion 532 arranged at a predetermined distance from the first plate portion 531 in the axial direction of the shaft portion 51, and a plurality of connecting portions 533 that connect the first plate portion 531 and the second plate portion 532.

[0047] As shown in Figures 10 and 12, the second plate portion 532 has a through hole 532A that penetrates in the thickness direction, i.e., in the axial direction of the shaft portion 51. In this embodiment, the first plate portion 531 and the second plate portion 532 are formed from rectangular plate members, and the four corner portions are connected by four connecting portions 533 (only two connecting portions 533 are shown in Figures 9 to 12), but this is not the only possible configuration, and there are no particular restrictions on the shape of the first plate portion 531 and the second plate portion 532 or the number of connecting portions 533.

[0048] The head 54 has a cylindrical small-diameter portion 541 and a large-diameter portion 542 with different outer diameters. The outer diameter of the small-diameter portion 541 is smaller than the diameter of the through-hole 532A in the second plate portion 532 of the bracket 53. The outer diameter of the large-diameter portion 542 is larger than the diameter of the through-hole 532A in the second plate portion 532 of the bracket 53. In addition, the length of the large-diameter portion 542 is shorter than the distance between the first plate portion 531 and the second plate portion 532.

[0049] As shown in Figures 10 and 12, the small-diameter portion 541 is inserted through the through-hole 532A and one end is fixed to the tip of the rod 520 of the hydraulic cylinder 52. The large-diameter portion 542 is interposed between the first plate portion 531 and the second plate portion 532 and is provided at the other end of the small-diameter portion 541. The small-diameter portion 541 and the large-diameter portion 542 may be formed from a single component, or they may be formed integrally by joining different components.

[0050] Furthermore, as mentioned above, the large-diameter portion 542 is formed with an outer diameter larger than the diameter of the through hole 532A in the second plate portion 532, but in this embodiment, it is set to a dimension smaller than the distance between adjacent connecting portions 533. Therefore, the large-diameter portion 542 is positioned between the first plate portion 531 and the second plate portion 532 in a state where it does not come into contact with the four connecting portions 533 (i.e., with a gap between it and the four connecting portions 533).

[0051] As shown in Figures 9 and 10, when the rod 520 of the hydraulic cylinder 52 is retracted, the large-diameter portion 542 has one end face 542A on the small-diameter portion 541 side in contact with the second plate portion 532. The bracket 53 is pulled towards the hydraulic cylinder 52 side, i.e., towards the arm 32 side, by the contact force of the large-diameter portion 542, and consequently, the shaft portion 51 is also pulled towards the arm 32 side. As a result, the shaft portion 51, which was inserted through the insertion hole 343A of the protruding portion 343, is removed from the insertion hole 343A.

[0052] On the other hand, as shown in Figures 11 and 12, when the rod 520 of the hydraulic cylinder 52 is extended, the large-diameter portion 542 has its other end face 542B, opposite to the small-diameter portion 541, in contact with the first plate portion 531. The bracket 53 is pushed outwards toward the opposite side of the hydraulic cylinder 52, that is, toward the side away from the arm 32, by the contact force of the large-diameter portion 542, and consequently, the shaft portion 51 is also pushed outwards toward the side away from the arm 32. As a result, the shaft portion 51 is inserted into the insertion hole 343A of the protruding portion 343 of the stowed scraping device 34.

[0053] As mentioned above, the large-diameter portion 542 is formed to be shorter in length than the distance between the first plate portion 531 and the second plate portion 532. Therefore, when the rod 520 of the hydraulic cylinder 52 is retracted, a gap is formed between the large-diameter portion 542 and the first plate portion 531 (see Figures 9 and 10), and when the rod 520 of the hydraulic cylinder 52 is extended, a gap is formed between the large-diameter portion 542 and the second plate portion 532 (see Figures 11 and 12).

[0054] In this way, when the shaft portion 51 of the locking member 5 is inserted through the insertion hole 343A of the protruding portion 343 of the stowed scraping device 34, the scraping device 34 becomes stuck on the shaft portion 51 and cannot rotate, i.e., it becomes locked.

[0055] On the other hand, when the shaft portion 51 of the locking member 5 is removed from the insertion hole 343A of the protruding portion 343 of the locked scraping device 34, the scraping device 34 becomes rotatable, i.e., unlocked.

[0056] In this embodiment, the shaft portion 51 follows the extension and retraction movement of the rod 520 of the hydraulic cylinder 52 via the bracket 53 and head 54. That is, since the shaft portion 51 and the rod 520 of the hydraulic cylinder 52 are not directly connected, even if the load of the scraping device 34 is applied to the shaft portion 51, the load applied to the rod 520 of the hydraulic cylinder 52 can be suppressed.

[0057] Furthermore, in this embodiment, a gap is present between the bracket 53 and the head 54, and this gap acts as a buffer, thereby reducing the load transmitted from the bracket 53 to the head 54.

[0058] <Configuration of display device 6> Next, the specific configuration of the display device 6 will be explained with reference to Figures 5 to 8.

[0059] The display device 6 has a pair of opposing surfaces 61 and 62 that are arranged at a predetermined distance apart in the axial direction of the shaft portion 51 of the locking member 5, and a plate-shaped marker plate 63 that is positioned between the pair of opposing surfaces 61 and 62 and serves as a marker to indicate that the scraping device 34 is in the stored position.

[0060] The pair of opposing surfaces 61 and 62 are formed by bending a plate member and are attached to the side of the frame 55 of the locking member 5 opposite to the mounting surface with the arm 32. In the following description, of the pair of opposing surfaces 61 and 62, the opposing surface 61 on the side in contact with the frame 55 will be referred to as the "first opposing surface 61," and the other opposing surface 62 will be referred to as the "second opposing surface 62."

[0061] The first opposing surface portion 61 has a first opposing region 61A which is located axially opposite to the shaft portion 51 of the locking member 5 and serves as the mounting area with the locking member 5, a second opposing region 61B which is located below the first opposing region 61A, and a connecting region 61C which connects the first opposing region 61A and the second opposing region 61B.

[0062] The second opposing surface portion 62 includes a first opposing region 62A that faces the first opposing region 61A of the first opposing surface portion 61, a second opposing region 62B located below the first opposing region 62A, and a connecting region 62C that connects the first opposing region 62A and the second opposing region 62B.

[0063] As shown in Figures 5 and 7, the first opposing surface portion 61 and the second opposing surface portion 62 are fixed to the frame 55 of the locking member 5 by a plurality of bolts (not shown) in the first opposing regions 61A and 62A. In addition, circular through holes 610A and 620A are formed in the first opposing regions 61A and 62A, respectively, through which the shaft portion 51 of the locking member 5 can be inserted, extending in the thickness direction.

[0064] As shown in Figure 8, the width between the first opposing region 61A of the first opposing surface portion 61 and the first opposing region 62A of the second opposing surface portion 62 is set to be greater than the thickness of the protruding portion 343 of the scraping device 34 and the thickness of the marker plate 63. Furthermore, the width between the second opposing region 61B of the first opposing surface portion 61 and the second opposing region 62B of the second opposing surface portion 62 is set to be greater than the outer diameter of the rod portion 341 of the scraping device 34.

[0065] In other words, the width between the second opposing region 61B of the first opposing surface portion 61 and the second opposing region 62B of the second opposing surface portion 62 is smaller than the width between the first opposing region 61A of the first opposing surface portion 61 and the first opposing region 62A of the second opposing surface portion 62.

[0066] Furthermore, as a result, the connecting region 61C of the first opposing surface portion 61 is inclined from the locking member 5 side toward the second opposing surface portion 62 side, and the connecting region 62C of the second opposing surface portion 62 is inclined toward the locking member 5 side in a direction symmetric to the inclination direction of the connecting region 61C of the first opposing surface portion 61.

[0067] Thus, in the connecting regions 61C and 62C, the width between them gradually narrows from the second opposing regions 61B and 62B towards the first opposing regions 61A and 62A. This allows the protruding portion 343 to be smoothly inserted between the first opposing regions 61A and 62A, which have a narrower width than the second opposing regions 61B and 62B. In other words, the connecting regions 61C and 62C act as guides for the protruding portion 343 between the first opposing regions 61A and 62A.

[0068] As shown in Figures 5 and 6, the marker plate 63 is positioned between the first opposing region 61A of the first opposing surface portion 61 and the first opposing region 62A of the second opposing surface portion 62 when the scraping device 34 is in its retracted position, that is, before the protruding portion 343 is inserted between the first opposing regions 61A and 62A.

[0069] Furthermore, as shown in Figure 7, the marker plate 63 has a circular through hole 63A and a pair of elongated holes 63B arranged in a row with the through hole 63A in between, extending through the plate in the thickness direction. The through hole 63A corresponds to the through holes 610A and 620A formed in the first opposing region 61A of the first opposing surface portion 61 and the first opposing region 62A of the second opposing surface portion 62, and the shaft portion 51 of the locking member 5 can be inserted through it.

[0070] Each of the pair of elongated holes 63B extends in the direction of alignment of the regions in the first opposing surface portion 61 and the second opposing surface portion 62 (the height direction of the arm 32), and bolts that fix the first opposing surface portion 61 and the second opposing surface portion 62 to the frame 55 of the locking member 5 are inserted through them (see Figures 6 and 8).

[0071] The marker plate 63 is held between the first opposing region 61A of the first opposing surface portion 61 and the first opposing region 62A of the second opposing surface portion 62 by having one end (upper end) of a pair of elongated holes 63B engage with each bolt. In other words, the marker plate 63 is not fixed to the first opposing surface portion 61 and the second opposing surface portion 62, but is movable within the length range of the pair of elongated holes 63B.

[0072] As shown in Figures 7 and 8, when the scraping device 34 is in the retracted position, the marker plate 63 is pushed out from between the first opposing regions 61A and 62A to the opposite side from the second opposing regions 61B and 62B by the protruding portion 343 inserted between the first opposing regions 61A and 62A, and is exposed in a position visible from inside the driver's cab 22. This allows the operator to confirm from inside the driver's cab 22 that the scraping device 34 has assumed the retracted position.

[0073] <Operation of the scraping device 34> Next, the operator's operation when moving the scraping device 34 between the stowed position and the working position will be explained with reference to Figures 13 and 14.

[0074] Figure 13 is a schematic diagram showing a partial configuration example inside the driver's cab 22. Figure 14 is a flowchart showing a series of operating procedures from the start of use to the retraction of the scraping device 34.

[0075] To operate the scraping device 34 between the stowed position and the working position, various switches located inside the operator's cab 22 are used. As shown in Figure 13, operating levers 222L and 222R for operating the working device 13 are provided inside the operator's cab 22 on both the left and right sides of the operator's seat 221 where the operator sits.

[0076] The operating lever 222R on the right side is equipped with a take-out switch 223A for setting the scraping device 34 to the working position and a storage switch 223B for setting the scraping device 34 to the retracted position.

[0077] When the operator operates the retrieval switch 223A, the hydraulic motor 4 rotates in one direction, and the scraping device 34 rotates around the drive shaft 40 from the storage position X to the working position Y. On the other hand, when the operator operates the storage switch 223B, the hydraulic motor 4 rotates in the other direction, and the scraping device 34 rotates around the drive shaft 40 from the working position Y to the storage position X.

[0078] Further to the right of the operating lever 222R on the right side, there is an operating panel 226 equipped with multiple operating switches, including a mode switching switch 224 for switching the operating mode of the work device 13 and a lock switch 225 for operating the locking member 5.

[0079] The mode selector switch 224 consists of a switch 224A for the normal mode in which the work device 13 operates according to the operation of the operating levers 222L and 222R (hereinafter referred to as "normal mode switch 224A") and a switch 224B for the scraping mode, which is used during scraping operations and immobilizes the bucket 33 (hereinafter referred to as "scraping mode switch 224B").

[0080] For example, in normal operations that do not use the scraping device 34, such as excavation, loading, and leveling, the operator can switch to normal mode by turning on the normal mode switch 224A, and the boom 31, arm 32, and bucket 33 will operate according to the operation of the control levers 222L and 222R, respectively.

[0081] On the other hand, in scraping operations using the scraping device 34, the operator switches to scraping mode by turning on the scraping mode switch 224B. This fixes the bucket 33 in front of the arm 32 and above the working position of the scraping device 34 (as shown in Figure 2), and only the boom 31 and arm 32 move according to the operation of the control levers 222L and 222R. This prevents situations in which the operator accidentally operates the bucket 33, causing it to collide with the scraping device 34 and break.

[0082] The lock switch 225 switches between ON and OFF. When the lock switch 225 is operated to ON, the rod 520 of the hydraulic cylinder 52 extends, and the locking member 5 locks the scraping device 34 in the retracted position. On the other hand, when the lock switch 225 is operated to OFF, the rod 520 of the hydraulic cylinder 52 retracts, and the locking member 5 releases the locked state of the scraping device 34.

[0083] As shown in Figure 14, first the operator determines whether the working device 13 is in the scraping position (step S101). At this time, the operating mode of the working device 13 is assumed to be the normal mode, and the scraping device 34 is locked by the locking member 5. Furthermore, the "scraping position" refers to a position in which the bucket 33 is positioned above the scraping device 34 in the working position (see Figure 2).

[0084] If it is determined in step S101 that the work device 13 is in the scraping position (step S101 / YES), the operator turns the lock switch 225 to OFF (step S102). This releases the scraping device 34.

[0085] If it is determined in step S101 that the working device 13 is not in the scraping position (step S101 / NO), the operator will not perform the next operation until the working device 13 is in the scraping position.

[0086] Next, the operator switches the working device 13 from normal mode to scraping mode by turning on the scraping mode switch 224B (step S103). This fixes the bucket 33 in place, making it immobile.

[0087] Then, the operator turns on the removal switch 223A (step S104). This causes the scraping device 34 to rotate and assume the working position, and the working device 13 becomes capable of performing the scraping operation.

[0088] Next, the operator determines whether the scraping operation is complete (step S105). If it is determined in step S105 that the scraping operation is complete (step S105 / YES), the operator turns on the storage switch 223B (step S106). As a result, the scraping device 34 rotates to assume the storage position, and the marker plate 63 is exposed.

[0089] If it is determined in step S105 that the scraping operation is not yet complete (step S105 / NO), the operator shall not perform the next operation until the scraping operation is completed.

[0090] Next, the operator switches the operating mode of the work device 13 from scraping mode to normal mode by turning on the normal mode switch 224A (step S107). This releases the bucket 33 from its fixed position, making it operable.

[0091] Then, the operator turns the lock switch 225 ON (step S108). This locks the scraping device 34 with the locking member 5.

[0092] Embodiments of the present invention have been described above. It should be noted that the present invention is not limited to the embodiments described above, and various modifications are included. For example, the embodiments described above are described in detail for the purpose of clearly illustrating the present invention, and are not necessarily limited to those having all the described configurations. Furthermore, it is possible to replace some of the configurations of an embodiment with those of another embodiment, and it is also possible to add configurations from other embodiments to the configurations of an embodiment. Moreover, it is possible to add, delete, or replace some of the configurations of an embodiment with those of other embodiments.

[0093] For example, in the above embodiment, a crawler-type hydraulic excavator 1 was described as one form of construction machinery, but it is not limited to this, and any other construction machinery equipped with a working device 13 may be used.

[0094] Furthermore, in the above embodiment, a hydraulic motor 4 was given as an example of a drive member that rotatably drives the scraping device 34, but the drive member does not necessarily have to be hydraulic; it may be electric, such as an electric motor.

[0095] Furthermore, in the above embodiment, the locking member 5 employs a mechanism using the extension and retraction of a hydraulic cylinder 52, but it is not limited to this, and there are no particular restrictions on the mechanism as long as it is a mechanism that can lock the scraping device 34 in the retracted position. [Explanation of Symbols]

[0096] 1: Hydraulic excavator (construction machinery) 4: Hydraulic motor (drive component) 5: Locking component 6:Display device 12: Rotating body (aircraft) 13: Working equipment 22: Driver's cab 31: Boom (arm component) 32: Arm (arm component) 33: Bucket (work tool) 34: Scraping device 40: Drive shaft 51: Shaft 52: Hydraulic Cylinder 53: Bracket 54: Head 61: First opposing surface part 62:Second opposing surface part 63: Marker plate (marking part) 341: Rod section 342: Scraping section 343: Protruding section 520: Rod 531: 1st plate part 532:Second plate part 532A:Through hole 533: Connection part 541: Small diameter section 542: Large diameter section 542A: One end surface 542B: Other end surface

Claims

1. The aircraft and, A working device having an arm member attached to the machine body and a working tool attached to the tip of the arm member, In construction machinery equipped with, The aforementioned work apparatus is A scraping device that can rotate between a storage position in which the arm member is stored on the side and a working position in which the tip of the arm member is positioned toward the work tool, A drive member that drives the scraping device so that it can rotate relative to the arm member, A locking member for locking the scraping device in the storage position, Equipped with, The aforementioned drive member is The drive shaft is attached to the arm member and extends toward the side of the arm member, The locking member is The arm member is provided on the side portion, The shaft portion of the drive member extends along the axial direction of the drive shaft, A hydraulic cylinder that drives the aforementioned shaft in its axial direction, It has, The scraping device is, A rod-shaped shaft portion with its base end attached to the aforementioned drive shaft, The tip of the rod portion in the extension direction is provided with a scraping section for scraping out the workpiece, An insertion hole is formed through which the shaft portion is inserted and removed, and a protruding portion extends from the outer surface of the rod portion, It has, The drive shaft rotates, and the scraping portion is positioned on the base end side of the arm member and the rod portion extends along the arm member in the storage position, The working posture in which the scraping portion is positioned on the side of the work tool and the rod portion extends toward the side of the work tool, Take, In the aforementioned storage position, The protruding portion extends upward along the side of the arm member, and the rod of the hydraulic cylinder extends so that the shaft is inserted into the insertion hole, resulting in a locked state. A construction machine characterized by the following features.

2. In the construction machine described in claim 1, The locking member is A bracket provided at the base end of the shaft portion, A head provided at the tip of the rod of the hydraulic cylinder, It further possesses, The aforementioned bracket is The base end of the shaft portion is fixed to the first plate portion, A second plate portion is arranged at a predetermined distance in the axial direction from the first plate portion and the shaft portion, and has a through hole formed therein that penetrates the shaft portion in the axial direction, A connecting portion that connects the first plate portion and the second plate portion, Includes, The head is A small-diameter portion whose outer diameter is smaller than the diameter of the through hole, and which is inserted through the through hole and has one end fixed to the tip of the rod of the hydraulic cylinder, A large-diameter portion is provided at the other end of the small-diameter portion, with an outer diameter larger than the diameter of the through hole and a length shorter than the predetermined interval, and is interposed between the first plate portion and the second plate portion. Includes, The aforementioned large diameter portion is When the rod of the hydraulic cylinder is retracted, one end surface on the side of the small diameter portion comes into contact with the second plate portion. When the rod of the hydraulic cylinder is extended, the other end face opposite to the one end face abuts against the first plate. A construction machine characterized by the following features.

3. In the construction machine described in claim 1, The device further comprises a display device having a pair of opposing surfaces attached to the locking member at a predetermined distance apart in the axial direction of the shaft, and a marker portion positioned between the pair of opposing surfaces to indicate that the scraping device is in the stored position, The aforementioned display device is When the scraping device is in the retracted position, the protruding portion of the scraping device is inserted between the pair of opposing surfaces, and the inserted protruding portion pushes the marker portion out from between the pair of opposing surfaces, exposing it to a position visible from the driver's cab located in the machine. A construction machine characterized by the following features.

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