Construction machinery

Abstract

To determine inclination of block bodies stacked inside a weight cover.SOLUTION: A rotating frame 13 comprises: a weight cover 17 whose interior is a weight storage chamber 21; and a stacked-type counterweight 23 including a first block body 24, a second block body 25, and a third block body 26 stored in the weight storage chamber 21. The first block body 24, the second block body 25, and the third block body 26 have ridge lines 24G, 25F, 26G, and the weight cover 17 is provided with reinforcing members 22A, 22B and an upper frame member 18 as mark portions. When the first block body 24, the second block body 25, and the third block body 26 are stored in the weight storage chamber 21, inclinations of the first block body 24, the second block body 25, and the third block body 26 can be determined by comparing the ridge lines 24G, 25F, 26G, with the reinforcing members 22A, 22B, and the upper frame member 18.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a construction machine equipped with a laminated counterweight such as a hydraulic excavator.

Background Art

[0002] A hydraulic excavator, which is representative of construction machines, includes a self-propelled lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, and a working device provided on the front side of the upper revolving body. The working device is rotatably attached to the front side of a revolving frame that serves as the base of the upper revolving body, and a counterweight for balancing the weight with the working device is provided on the rear side of the revolving frame. When using a hydraulic excavator to demolish a structure with a large ground height such as a high-rise building, a working device for demolition work is attached.

[0003] The working device for demolition work usually includes a plurality of booms called a multi-boom. An arm is attached to the foremost end of this multi-boom, and a working tool such as a crusher or a grapple is attached to the tip of the arm. Since the working device for demolition work is heavy, it is necessary to increase the weight of the counterweight for balancing the weight with this working device. For example, a laminated counterweight formed by stacking a plurality of block bodies is used. The plurality of block bodies constituting the laminated counterweight are transported to the work site separately from the upper revolving body, stacked on the rear side of the revolving frame at the work site, and then fixed on the revolving frame using long bolts inserted in the vertical direction.

[0004] Also, a weight cover is attached to the rear side of the revolving frame, and a laminated counterweight in a form in which a plurality of block bodies are stacked and housed inside this weight cover is known (Patent Document 1). The laminated counterweight provided with this weight cover is provided with a proximity sensor on the weight cover, and it is possible to determine whether or not a block body is housed in the weight cover by this proximity sensor.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2014-101190 [Overview of the project] [Problems that the invention aims to solve]

[0006] Incidentally, when stacking multiple blocks that make up a stacked counterweight behind a slewing frame at a work site, soil and other debris may be attached to the underside of the blocks. When blocks with soil and other debris attached to their undersides are stacked on top of other blocks, the upper blocks will tilt relative to the lower blocks, making it impossible to stack the multiple blocks horizontally.

[0007] In particular, when a weight cover is attached to a slewing frame and multiple block bodies are stacked inside this weight cover, the block bodies cannot be directly visually inspected, making it impossible to determine if the block bodies are stacked at an angle inside the weight cover. As a result, it becomes difficult to insert long bolts through the multiple block bodies stacked on the slewing frame, and there is a problem in that the stacked multiple block bodies cannot be fixed to the slewing frame. The stacked counterweight described in Patent Document 1 can determine whether or not block bodies are housed inside the weight cover, but it cannot determine whether or not multiple block bodies are stacked at an angle.

[0008] The object of the present invention is to provide a construction machine that can determine the inclination of block bodies stacked inside a weight cover. [Means for solving the problem]

[0009] The present invention relates to a construction machine comprising: a frame on which a working device is provided on the front side; a weight cover provided on the rear side of the frame, with an opening on the upper side and having a weight storage chamber inside; and a stacked counterweight comprising multiple layers of block bodies stacked vertically and housed in the weight storage chamber of the weight cover, wherein the block bodies of the stacked counterweight have a ridge line extending horizontally between the side surface and the top surface when the block bodies are placed horizontally, and the weight cover is provided with a marking portion that can be compared with the ridge line when the block bodies are housed in the weight storage chamber. The aforementioned marking portion is a reinforcing member provided in multiple locations on the weight cover, extending in the left-right direction and extending in the up-down direction, in order to reinforce the weight cover. It is characterized by the following: [Effects of the Invention]

[0010] According to the present invention, when stacking blocks in the weight storage chamber of a weight cover, the inclination of the blocks can be determined by comparing the markings provided on the weight cover with the edges of the blocks. [Brief explanation of the drawing]

[0011] [Figure 1] A left side view showing a hydraulic excavator for demolition work according to an embodiment of the present invention. [Figure 2] This is a perspective view showing a stacked counterweight consisting of four block bodies attached to the slewing frame. [Figure 3] This is a perspective view showing the swivel frame with the weight cover attached. [Figure 4] This is a perspective view showing the first block body placed inside the weight cover. [Figure 5] This is a perspective view showing the second block body placed inside the weight cover. [Figure 6] This is a perspective view showing the three layers of block bodies fixed inside the weight cover. [Figure 7] This is a perspective view showing the fourth block body fixed on the third block body. [Figure 8]This is a perspective view showing a weight cover with a step as a marker. [Modes for carrying out the invention]

[0012] The following will describe in detail an embodiment of the present invention, using as an example its application to a hydraulic excavator for demolition work, with reference to the attached drawings. In this embodiment, the direction of travel of the hydraulic excavator will be described as the front-rear direction, and the direction perpendicular to the direction of travel will be described as the left-right direction.

[0013] The hydraulic excavator 1 for demolition work consists of a self-propelled crawler-type lower vehicle 2, an upper rotating vehicle 3 that is rotatably mounted on the lower vehicle 2, and a working device 4 provided on the front side of the upper rotating vehicle 3. The lower vehicle 2 and the upper rotating vehicle 3 constitute the body of the hydraulic excavator 1. The hydraulic excavator 1 is suitably used for demolition work, for example, for demolishing structures with a large height above the ground, such as high-rise buildings.

[0014] The multi-boom type work device 4 is mounted on the front side of the slewing frame 13 that constitutes the upper slewing body 3. The work device 4 consists of a multi-boom 5 mounted on the front end of the slewing frame 13, a middle arm 6 mounted on the tip of the multi-boom 5, an arm 7 mounted on the tip of the middle arm 6, and a crusher 8 mounted on the tip of the arm 7. The multi-boom 5 consists of a lower boom 5A, an intermediate boom 5B, and an upper boom 5C, and the arm 7 consists of a lower arm 7A and an upper arm 7B.

[0015] A boom cylinder 9 is provided between the slewing frame 13 and the lower boom 5A to rotate the multi-boom 5 relative to the slewing frame 13. A middle arm cylinder 10 is provided between the upper boom 5C and the middle arm 6 to rotate the middle arm 6 relative to the multi-boom 5. An arm cylinder 11 is provided between the middle arm 6 and the lower arm 7A to rotate the arm 7 relative to the middle arm 6. A work tool cylinder 12 is provided between the upper arm 7B and the crusher 8 to rotate the crusher 8 relative to the arm 7.

[0016] The upper revolving body 3 includes a revolving frame 13 serving as a base, a cab 14 disposed on the left front side of the revolving frame 13, a counterweight 16 (described later) provided on the rear side of the revolving frame 13, and an exterior cover 15 disposed on the front side of the counterweight 16. The cab 14 defines a driver's cab in which an operator who operates the hydraulic excavator 1 rides. Inside the cab 14, a driver's seat, an operating device for traveling, an operating lever for operating the working device 4 (none of which are shown in the drawings), etc. are provided. Inside the exterior cover 15, an engine, a hydraulic pump, a heat exchange device, etc. (none of which are shown in the drawings) are accommodated.

[0017] As shown in FIGS. 2 to 8, the revolving frame 13 has a thick flat plate-shaped bottom plate 13A extending in the front-rear direction, and left and right vertical plates 13B and 13C erected on the bottom plate 13A. The left vertical plate 13B and the right vertical plate 13C face each other at a constant interval in the left-right direction and extend in the front-rear direction. On the front end sides of the left vertical plate 13B and the right vertical plate 13C, the proximal end side of the lower boom 5A is rotatably attached, and the proximal end side of the boom cylinder 9 is rotatably attached.

[0018] On the rear end sides of the bottom plate 13A, the left vertical plate 13B, and the right vertical plate 13C constituting the revolving frame 13, a rectangular cover mounting plate 13D rising vertically upward from the bottom plate 13A is welded, and a weight cover 17 (described later) is attached to the cover mounting plate 13D. Further, the rear ends of the left vertical plate 13B and the right vertical plate 13C protrude rearward from the cover mounting plate 13D, respectively, and serve as left weight attachment portions 13E and right weight attachment portions 13F (see FIG. referring to FIG. 2). A laminated counterweight 23 (described later) is attached to these left weight attachment portions 13E and right weight attachment portions 13F. Further, bolt insertion holes (not shown) penetrating in the vertical direction are formed in the left weight attachment portion 13E and the right weight attachment portion 13F, respectively, and the first block body 24, the second block body 25, and the third block body 26 constituting the laminated counterweight 23 are fixed to the revolving frame 13 by long bolts 28 (described later) inserted through these bolt insertion holes.

[0019] Next, the counterweight 16 according to this embodiment will be described.

[0020] The counterweight 16 is provided on the rear side of the swing frame 13 and balances the weight with the working device 4. The counterweight 16 includes a weight cover 17 and a laminated counterweight 23.

[0021] The weight cover 17 is attached to the cover mounting plate 13D of the swing frame 13 using bolts or the like. The weight cover 17 is surrounded by a front panel 17A, a rear panel 17B, a left side panel 17C, and a right side panel 17D, and is formed in a rectangular tube shape with an open end 17E at the upper end side. The front panel 17A and the rear panel 17B have a length dimension equivalent to the width dimension of the swing frame 13 in the left-right direction and face each other at an interval in the front-rear direction. The left side panel 17C connects between the left end portions of the front panel 17A and the rear panel 17B, and the right side panel 17D connects between the right end portions of the front panel 17A and the rear panel 17B.

[0022] The middle portion of the rear panel 17B in the left-right direction becomes a rear overhanging portion 17F that protrudes rearward from the rear ends of the left side panel 17C and the right side panel 17D. A left bending portion 17G is formed between the rear overhanging portion 17F and the left side panel 17C, and a right bending portion 17H is formed between the rear overhanging portion 17F and the right side panel 17D. As a result, the weight cover 17 forms a hexagonal rectangular tube shape when viewed from above. Also, a lower connecting plate 17J extending in the front-rear direction is provided between the lower side of the rear overhanging portion 17F and the lower side of the front panel 17A. The lower connecting plate 17J connects between the rear overhanging portion 17F and the front panel 17A and is disposed on the left weight mounting portion 13E and the right weight mounting portion 13F of the swing frame 13.

[0023] An upper frame member 18 is provided at the open end 17E of the weight cover 17. The upper frame member 18 has a rear frame portion 18A fixed to the upper end of the rear panel 17B, a left frame portion 18B fixed to the upper end of the left side panel 17C, and a right frame portion 18C fixed to the upper end of the right side panel 17D. The front ends of the left frame portion 18B and the right frame portion 18C are fixed to the front panel 17A. The middle portion of the rear frame portion 18A in the left-right direction is a rear overhang portion 18D that extends rearward from the rear ends of the left frame portion 18B and the right frame portion 18C, similar to the rear panel 17B of the weight cover 17. A left bend portion 18E is formed between the rear overhang portion 18D and the left frame portion 18B, and a right bend portion 18F is formed between the rear overhang portion 18D and the right frame portion 18C.

[0024] The upper end of the left support column 19, which extends vertically, is fixed to the left bend portion 18E of the upper frame member 18. The upper end of the right support column 20, which extends vertically, is fixed to the right bend portion 18F of the upper frame member 18. The left support column 19 and the right support column 20 are arranged parallel to each other with a constant distance between them in the left-right direction. The lower ends of the left support column 19 and the right support column 20 are fixed to the lower connecting plate 17J of the weight cover 17, respectively. In this way, the weight cover 17 is formed in a strong frame shape including the upper frame member 18, the left support column 19 and the right support column 20, and a weight storage chamber 21 is formed inside the weight cover 17.

[0025] Multiple reinforcing members 22A and 22B are provided between the left support column 19 and the right support column 20. The reinforcing members 22A and 22B are formed from rods or plates that extend linearly in the left-right direction and are arranged parallel to each other with spacing in the vertical direction. The left ends of the lower reinforcing member 22A and the upper reinforcing member 22B are fixed to the left support column 19, respectively, and the right ends of the reinforcing members 22A and 22B are fixed to the right support column 20, respectively. In this way, the reinforcing members 22A and 22B reinforce the weight cover 17, including the left support column 19 and the right support column 20.

[0026] Here, when the weight cover 17 is attached to the slewing frame 13 of the hydraulic excavator 1, which is stopped on level ground, the reinforcing members 22A and 22B extend horizontally, forming the marker portion according to this embodiment. The vertical distance between the reinforcing member 22A and the reinforcing member 22B corresponds to the height dimension of the second block body 25, and the vertical distance between the reinforcing member 22B and the upper frame member 18 (rear overhang portion 18D) corresponds to the height dimension of the third block body 26.

[0027] Next, the stacked counterweight 23 will be described. The stacked counterweight 23 is composed of multiple layers (for example, four layers) of block bodies stacked vertically and is housed in the weight housing chamber 21 of the weight cover 17. That is, as shown in Figure 2, the stacked counterweight 23 is composed of four layers of block bodies: a first block body 24 located at the bottom, a second block body 25 stacked on top of the first block body 24, a third block body 26 stacked on top of the second block body 25, and a fourth block body 27 stacked on top of the third block body 26.

[0028] The first block body 24 is located at the bottom of the stacked counterweight 23. As shown in Figures 2 and 4, the first block body 24 is formed as a block body enclosed by an upper surface 24A, a lower surface, a front side surface, a rear side surface 24B, a left side surface 24C, and a right side surface. The rear side surface 24B of the first block body 24 corresponds to the shape of the rear plate 17B of the weight cover 17, and the middle part of the rear side surface 24B in the left-right direction protrudes further back than the rear ends of the left side surface 24C and the right side surface. A recessed portion 24D is formed in the middle part of the first block body 24 in the left-right direction, extending inward from the lower surface towards the upper surface 24A. As a result, when the first block body 24 is housed in the weight housing chamber 21 of the weight cover 17 attached to the slewing frame 13, the recessed portion 24D is mounted on the lower connecting plate 17J of the weight cover 17.

[0029] The upper surface 24A of the first block body 24 is provided with a plurality of positioning protrusions 24E that project upward in a V-shape. When the second block body 25 is stacked on top of the first block body 24, the positioning protrusions 24E engage with recesses (not shown) formed on the lower surface of the second block body 25, thereby positioning the second block body 25 horizontally relative to the first block body 24. In addition, the first block body 24 has a plurality of bolt insertion holes 24F that penetrate in the vertical direction and are spaced apart in the left-right direction. The bolt insertion holes 24F are positioned concentrically with the bolt insertion holes (not shown) formed in the left weight mounting portion 13E and the right weight mounting portion 13F of the slewing frame 13 when the weight cover 17 is attached to the slewing frame 13 and the first block body 24 is placed on the lower connecting plate 17J of the weight cover 17.

[0030] The first block body 24 has a ridge line 24G between its top surface 24A and its sides (front side, rear side 24B, left side 24C, and right side) where the top surface 24A and the side intersect. When a weight cover 17 is attached to the slewing frame 13 of a hydraulic excavator 1 stopped on level ground, and the first block body 24 is placed horizontally within the weight storage chamber 21 of the weight cover 17, the ridge line 24G of the first block body 24 extends horizontally. In this case, the ridge line 24G of the first block body 24 and the reinforcing member 22A of the weight cover 17 extend horizontally while maintaining a parallel state. That is, the reinforcing member 22A serves as a marker (indicator) that allows a worker to visually determine whether or not the first block body 24 is placed horizontally within the weight storage chamber 21 by comparing it with the ridge line 24G of the first block body 24.

[0031] Here, if soil or other debris is attached to the recessed portion 24D of the first block body 24, and the first block body 24 is placed in the weight storage chamber 21 of the weight cover 17, the soil or other debris will be trapped between the recessed portion 24D of the first block body 24 and the lower connecting plate 17J of the weight cover 17. In this case, the first block body 24 will tilt slightly relative to the weight cover 17. In this case, the worker performing the stacking work of the stacked counterweight 23 can compare the reinforcing member 22A of the weight cover 17 with the ridge line 24G of the first block body 24 and determine the tilt of the first block body 24 based on whether or not the ridge line 24G is parallel to the reinforcing member 22A. Thus, the reinforcing member 22A of the weight cover 17 serves as a marker that can be compared with the ridge line 24G of the first block body 24 when the first block body 24 is stored in the weight storage chamber 21. Therefore, by visually inspecting the reinforcing member 22A and the ridge line 24G, the worker can determine whether or not the first block body 24 is positioned horizontally within the weight storage chamber 21. In this case, the positional relationship between the reinforcing member 22A and the ridge line 24G in the height direction may be such that the reinforcing member 22A and the ridge line 24G are positioned at the same height, or the reinforcing member 22A may be positioned slightly higher than the ridge line 24G.

[0032] The second block body 25 is stacked on top of the first block body 24. As shown in Figures 2 and 5, the second block body 25 is formed as a block body enclosed by an upper surface 25A, a lower surface, a front side surface, a rear side surface 25B, a left side surface 25C, and a right side surface. The middle part of the rear side surface 25B of the second block body 25 extends further back than the rear ends of the left side surface 25C and the right side surface. The upper surface 25A of the second block body 25 is provided with a plurality of positioning protrusions 25D that project upward in a V-shape. When the third block body 26 is stacked on top of the second block body 25, the positioning protrusions 25D engage with recesses (not shown) formed on the lower surface of the third block body 26, thereby positioning the third block body 26 horizontally relative to the second block body 25. In addition, the second block body 25 has a plurality of bolt insertion holes 25E that penetrate in the vertical direction and are spaced apart in the horizontal direction. The bolt insertion hole 25E is positioned concentrically with the bolt insertion hole 24F of the first block body 24 when the second block body 25 is stacked on top of the first block body 24.

[0033] The second block body 25 has a ridge line 25F between its top surface 25A and its sides (front side, rear side 25B, left side 25C, and right side) where the top surface 25A and the side intersect. When the second block body 25 is placed horizontally on the first block body 24, which is horizontally placed in the weight storage chamber 21 of the weight cover 17, the ridge line 25F of the second block body 25 and the reinforcing member 22B of the weight cover 17 extend in the left-right direction while maintaining a parallel state. In this way, the reinforcing member 22B serves as a marker that allows an operator to determine whether or not the second block body 25 is horizontally placed in the weight storage chamber 21 by visually comparing it with the ridge line 25F of the second block body 25 when the second block body 25 is placed on the first block body 24. In this case, the positional relationship between the reinforcing member 22B and the ridge line 25F in the height direction may be such that the reinforcing member 22B and the ridge line 25F are at the same height, or the reinforcing member 22B may be positioned slightly higher than the ridge line 25F.

[0034] The third block body 26 is stacked on top of the second block body 25. As shown in Figures 2 and 6, the third block body 26 is formed as a block body enclosed by an upper surface 26A, a lower surface, a front side surface, a rear side surface 26B, a left side surface 26C, and a right side surface, and has the same shape as the second block body 25. Multiple positioning protrusions 26D are provided on the upper surface 26A of the third block body 26. When the fourth block body 27 is stacked on top of the third block body 26, the positioning protrusions 26D engage with recesses (not shown) formed on the lower surface of the fourth block body 27, thereby positioning the fourth block body 27 relative to the third block body 26.

[0035] The upper surface 26A of the third block body 26 has two bottomed elongated groove holes 26E extending in the front-rear direction, spaced apart in the left-right direction. The third block body 26 has a plurality of bolt insertion holes (not shown) that penetrate in the vertical direction, and the upper ends of the bolt insertion holes open into the elongated groove holes 26E. When the third block body 26 is stacked on top of the second block body 25, the plurality of bolt insertion holes are positioned concentrically with the bolt insertion holes formed in the swivel frame 13 (left weight mounting portion 13E and right weight mounting portion 13F), the bolt insertion hole 24F of the first block body 24, and the bolt insertion hole 25E of the second block body 25. Then, long bolts 28 are inserted through the bolt insertion holes formed in the swivel frame 13, the bolt insertion holes 24F in the first block body 24, the bolt insertion holes 25E in the second block body 25, and the bolt insertion holes in the third block body 26. Nuts 28A are then screwed onto these long bolts 28 from the upper surface 26A side of the third block body 26, thereby fixing the first block body 24, the second block body 25, and the third block body 26 in a stacked state. At this time, the nuts 28A are housed in the long groove holes 26E formed in the upper surface 26A of the third block body 26. In addition, two bolt holes (female threaded holes) 26F are formed on the upper surface 26A of the third block body 26, adjacent to the long groove holes 26E in the left-right direction.

[0036] The third block body 26 has a ridge line 26G between its top surface 26A and its sides (front side, rear side 26B, left side 26C, and right side) where the top surface 26A and the side intersect. When the third block body 26 is placed horizontally on the second block body 25, which is horizontally placed in the weight storage chamber 21 of the weight cover 17, the ridge line 26G of the third block body 26 and the rear frame portion 18A of the upper frame member 18 extend horizontally while maintaining a parallel state. In this way, the upper frame member 18 serves as a marker that allows an operator to determine whether or not the third block body 26 is placed horizontally in the weight storage chamber 21 by visually comparing it with the ridge line 26G of the third block body 26 when the third block body 26 is placed on the second block body 25. In this case, the positional relationship between the upper frame member 18 (rear frame portion 18A) and the ridge line 26G in the height direction may be such that the upper frame member 18 and the ridge line 26G are at the same height, or the upper frame member 18 may be positioned slightly higher than the ridge line 26G.

[0037] The fourth block body 27 is stacked on top of the third block body 26. As shown in Figures 2 and 7, the fourth block body 27 is formed as a block body enclosed by a top surface 27A, a bottom surface, a front side surface 27B, a rear side surface 27C, a left side surface 27D, and a right side surface, and has the same shape as the second block body 25 and the third block body 26. Multiple positioning protrusions 27E are provided on the top surface 27A of the fourth block body 27. When additional weights (not shown) are stacked on top of the fourth block body 27, the positioning protrusions 27E engage with recesses formed on the bottom surface of the additional weights, thereby positioning the additional weights.

[0038] The fourth block body 27 has two bolt insertion holes (not shown) that penetrate vertically, corresponding to the bolt holes 26F of the third block body 26. With the fourth block body 27 stacked on top of the third block body 26, bolts 29 are inserted through the bolt insertion holes, and the fourth block body 27 is fixed in place by tightening these bolts 29 into the bolt holes 26F of the third block body 26.

[0039] The hydraulic excavator 1 according to this embodiment has the configuration described above, and the following describes the process of attaching the counterweight 16 to the slewing frame 13.

[0040] First, with the hydraulic excavator 1 stopped on level ground, the lower connecting plate 17J of the weight cover 17, which has been lifted using a hydraulic crane or the like (not shown), is placed on the left weight mounting portion 13E and the right weight mounting portion 13F of the slewing frame 13. In this state, the weight cover 17 is fixed to the cover mounting plate 13D of the slewing frame 13 using bolts or the like to maintain a horizontal position.

[0041] Next, the first block body 24 is lifted and lowered into the weight storage chamber 21 of the weight cover 17, and the recessed portion 24D of the first block body 24 is placed on the lower connecting plate 17J of the weight cover 17. At this time, the worker visually compares the ridge line 24G of the first block body 24 with the reinforcing member 22A of the weight cover 17 to determine whether they are parallel or not. If the ridge line 24G and the reinforcing member 22A are not parallel, it can be determined that the first block body 24 is tilted relative to the weight cover 17 because soil and other debris attached to the recessed portion 24D of the first block body 24 are trapped between it and the lower connecting plate 17J of the weight cover 17.

[0042] In this case, the first block body 24 is lifted above the weight cover 17, and with the soil and other debris adhering to the recessed portion 24D removed, the recessed portion 24D of the first block body 24 is placed back on the lower connecting plate 17J of the weight cover 17. In this state, if the ridge line 24G and the reinforcing member 22A extend in the left-right direction while remaining parallel, it can be determined that the first block body 24 is positioned horizontally with respect to the weight cover 17.

[0043] Next, the second block body 25 is lifted and lowered into the weight storage chamber 21, and the second block body 25 is placed on the first block body 24 with the recess formed on the lower surface of the second block body 25 engaged with the positioning projection 24E of the first block body 24. At this time, the worker visually compares the ridge line 25F of the second block body 25 with the reinforcing member 22B of the weight cover 17 to determine whether or not they are parallel.

[0044] If the ridge line 25F and the reinforcing member 22B are not parallel, it can be determined that the second block body 25 is tilted due to soil or other debris adhering to the underside of the second block body 25. In this case, the second block body 25 is lifted up to remove the soil or other debris, and then the second block body 25 is placed back on the first block body 24. If the ridge line 25F and the reinforcing member 22B extend horizontally while remaining parallel, it can be determined that the second block body 25 is positioned horizontally with respect to the first block body 24, and the process proceeds to the next step.

[0045] After the second block body 25 is placed horizontally on the first block body 24, the third block body 26 is lifted and lowered into the weight storage chamber 21. Then, with the recess formed on the lower surface of the third block body 26 engaged with the positioning projection 25D of the second block body 25, the third block body 26 is placed on the second block body 25. At this time, the worker visually compares the ridge line 26G of the third block body 26 with the rear frame portion 18A of the upper frame member 18 provided on the weight cover 17 to determine whether or not they are parallel.

[0046] If the ridge line 26G and the rear frame section 18A are not parallel, it can be determined that the third block body 26 is tilted due to soil or other debris adhering to the underside of the third block body 26. In this case, the third block body 26 is lifted up to remove the soil or other debris, and then the third block body 26 is placed back on the second block body 25. If the ridge line 26G and the rear frame section 18A extend horizontally while remaining parallel, it can be determined that the third block body 26 is positioned horizontally to the second block body 25, and the process proceeds to the next step.

[0047] When the third block body 26 is placed horizontally on the second block body 25, the bolt insertion holes of the swivel frame 13 (left weight mounting portion 13E and right weight mounting portion 13F), the bolt insertion hole 24F of the first block body 24, the bolt insertion hole 25E of the second block body 25, and the bolt insertion hole of the third block body 26 are positioned concentrically. Therefore, the long bolt 28 can be quickly inserted from the bolt insertion hole of the swivel frame 13 to the bolt insertion hole 24F of the first block body 24, the bolt insertion hole 25E of the second block body 25, and the bolt insertion hole of the third block body 26. Then, a nut 28A is screwed onto the tip of the long bolt 28 from the upper surface 26A side of the third block body 26, and the long bolt 28 is tightened with the nut 28A positioned in the long groove hole 26E. This allows the first block 24, the second block 25, and the third block 26 to be fixed in a stacked state using long bolts 28 while they are housed in the weight storage chamber 21 of the weight cover 17.

[0048] Next, the fourth block body 27 is lifted and placed on the third block body 26 with the recess formed on the lower surface of the fourth block body 27 engaged with the positioning projection 26D of the third block body 26. In this state, a bolt 29 is inserted from above through the bolt insertion hole formed in the fourth block body 27 and the bolt 29 is tightened into the bolt hole 26F of the third block body 26. As a result, the fourth block body 27 is fixed on the third block body 26, forming a stacked counterweight 23 consisting of the first block body 24, the second block body 25, the third block body 26, and the fourth block body 27, and a counterweight 16 consisting of a weight cover 17 and the stacked counterweight 23 can be attached to the rear end of the slewing frame 13.

[0049] Thus, the hydraulic excavator 1 according to this embodiment comprises a slewing frame 13 on which a working device 4 is provided on the front side, a weight cover 17 provided on the rear side of the slewing frame 13 with a weight storage chamber 21 inside and opening to the top, and a stacked counterweight 23 which includes multiple layers of block bodies (first block body 24, second block body 25, third block body 26) that are housed in the weight storage chamber 21 of the weight cover 17 and stacked in the vertical direction. The first block body 24, the second block body 25, and the third block body 26 have ridges 24G, 25F, and 26G that extend horizontally between their sides and top surfaces when they are arranged horizontally, and the weight cover 17 is provided with markings (reinforcement members 22A, 22B, upper frame member 18) that can be compared with the ridges 24G, 25F, and 26G when the first block body 24, the second block body 25, and the third block body 26 are housed in the weight storage chamber 21.

[0050] With this configuration, when housing the first block body 24, the second block body 25, and the third block body 26 in the weight housing chamber 21 of the weight cover 17, the inclination of the first block body 24, the second block body 25, and the third block body 26 can be determined by comparing the markers (reinforcement members 22A, 22B, upper frame member 18) provided on the weight cover 17 with the ridge lines 24G, 25F, and 26G of the first block body 24, the second block body 25, and the third block body 26. Therefore, the first block body 24, the second block body 25, and the third block body 26 can be stacked while correcting the inclination and accurately fixed using long bolts 28.

[0051] In this embodiment, the marker portion is a plurality of reinforcing members 22A and 22B that extend horizontally and vertically on the weight cover 17 to reinforce the weight cover 17. With this configuration, when the first block body 24 is placed in the weight storage chamber 21, it is possible to determine whether the first block body 24 is horizontally positioned in the weight storage chamber 21 by comparing the reinforcing member 22A with the edge line 24G of the first block body 24 and visually checking whether the two are parallel. Similarly, when the second block body 25 is placed in the weight storage chamber 21 and placed on the first block body 24, it is possible to determine whether the second block body 25 is horizontally positioned in the weight storage chamber 21 by comparing the reinforcing member 22B with the edge line 25F of the second block body 25 and visually checking whether the two are parallel.

[0052] Furthermore, by using the reinforcing members 22A and 22B that reinforce the weight cover 17 as markers, it is unnecessary to provide additional members on the weight cover 17 solely for the purpose of markers. As a result, the weight cover 17 can be simplified.

[0053] Next, Figure 8 shows a second embodiment of the present invention, characterized in that the marking portion is formed by multiple steps provided on the inner surface of the weight cover. In the second embodiment, the same reference numerals are used for the same components as in the first embodiment, and their descriptions are omitted.

[0054] In the figure, the weight cover 17 is attached to the cover mounting plate 13D of the slewing frame 13 using bolts or the like. Similar to the weight cover 17 in the first embodiment, the weight cover 17 is formed in a rectangular tube shape surrounded by a front plate 17A, a rear plate 17B, a left side plate 17C, and a right side plate 17D, with the upper end being an open end 17E. However, the inner surface of the right side plate 17D that constitutes the weight cover 17 is provided with a step 30 that serves as a foothold when entering and exiting the weight storage chamber 21 of the weight cover 17, and this step 30 is used as a marker, which is different from the first embodiment.

[0055] Step 30 is projected from the inner surface of the right side panel 17D and consists of steps 30B, 30C, and 30D arranged vertically at regular intervals from the lowest step 30A. Workers use these steps 30A, 30B, 30C, and 30D as footholds to enter and exit the weight storage chamber 21 of the weight cover 17. Of these four steps 30A, 30B, 30C, and 30D, for example, the third step from the bottom, step 30C, and the fourth step, step 30D, constitute the marker section according to this embodiment.

[0056] That is, when the first block body 24 is placed in the weight storage chamber 21, it is possible to determine whether the first block body 24 is positioned horizontally within the weight storage chamber 21 by comparing the third step 30C with the edge line 24G of the first block body 24 and visually checking whether they are parallel. In this case, the positional relationship in the height direction between the step 30C and the edge line 24G may be such that the step 30C and the edge line 24G are at the same height, or the step 30C may be positioned slightly higher than the edge line 24G. Furthermore, when the second block body 25 is placed in the weight storage chamber 21 and placed on top of the first block body 24, it is possible to determine whether the second block body 25 is positioned horizontally within the weight storage chamber 21 by comparing the fourth step 30D with the edge line 25F of the second block body 25 and visually checking whether they are parallel. In this case, the height relationship between step 30D and ridge line 25F may be such that step 30D and ridge line 25F are at the same height, or step 30D may be positioned slightly higher than ridge line 25F.

[0057] This embodiment has the configuration described above. In this embodiment as well, the steps 30C and 30D for entering and exiting the weight storage chamber 21 of the weight cover 17 are used as markers. By comparing the ridge line 24G of the first block body 24 with step 30C and the ridge line 25F of the second block body 25 with step 30D, the inclination of the first block body 24 and the second block body 25 can be determined. Therefore, the first block body 24, the second block body 25, and the third block body 26 can be stacked while correcting the inclination and accurately fixed using long bolts 28.

[0058] In the first embodiment, an example is shown in which two reinforcing members 22A and 22B are used as markers. However, the present invention is not limited to this, and for example, depending on the number and height dimensions of the multiple block bodies constituting the stacked counterweight, one or three or more reinforcing members may be provided.

[0059] Furthermore, the second embodiment illustrates a case in which a step 30 is provided on the inner surface of the right side panel 17D that constitutes the weight cover 17. However, the present invention is not limited to this, and for example, the weight cover 17 may be configured to have multiple steps on the inner surfaces of the front panel 17A, rear panel 17B, and right side panel 17D that constitute the weight cover 17. [Explanation of symbols]

[0060] 4. Working equipment 13. Swivel frame (frame) 16 Counterweights 17 Weight cover 18 Upper frame member (marking section) 21 Weight storage room 22A, 22B Reinforcement members (marking section) 23. Stacked Counterweight 24. Block letters (first block letters) 24G, 25F, 26G Ridge 25. Block letters (2nd block letters) 26. Third block letters (block letters) 27. Fourth block letter (block letter) 30 steps (marking section)

Claims

[Claim 1] A frame with a working device attached to the front, A weight cover is provided on the rear side of the frame, with an opening at the top and an interior serving as a weight storage chamber. A stacked counterweight comprising multiple layers of block bodies, which are housed in the weight housing chamber of the weight cover and stacked vertically, In a construction machine equipped with, The block body of the stacked counterweight has a ridge line that extends horizontally between the side surface and the top surface when the block body is placed horizontally. The weight cover is provided with a marking portion that can be compared with the ridge line when the block body is housed in the weight housing chamber. The construction machine is characterized in that the marking portion is a reinforcing member provided in multiple locations on the weight cover, extending in the left-right direction and extending in the up-down direction, in order to reinforce the weight cover.

Images