Crusher

Abstract

To suppress dispersion of crushed pieces outside a bucket.SOLUTION: A crusher 100 for crushing a structure E comprises: a fixed crushing arm 12; a movable crushing arm 13 turnably connected to the fixed crushing arm; a bucket 30 suspended from the fixed crushing arm to accept crushed pieces falling outside the structure; and a fence 50 erected on the bucket to catch the crushed pieces H that are going to be dispersed outside the bucket.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a crushing device, and more particularly to a crushing device for crushing structures. [Background technology]

[0002] When demolishing a structure, particularly a tower-like structure such as a chimney made of reinforced concrete, a crushing device is used to crush the structure. The crushing device has a fixed crushing arm and a movable crushing arm rotatably connected to the fixed crushing arm, and the fixed crushing arm and the movable crushing arm clamp the wall at the top of the structure and crush it. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 63-62548 Summary of the Invention [Problem to be solved by the invention]

[0004] The fragments generated by the crushing are generally dropped inside the structure, for example into a chimney, while the fragments that fall outside the structure are received by a bucket that has been placed close to or in contact with the exterior wall of the structure.

[0005] However, during crushing, relatively small fragments may fly outside the bucket and fall without being able to be collected by the bucket. Because crushing is carried out at high altitudes, it is preferable to prevent even these small fragments from falling as much as possible.

[0006] The present disclosure has been devised in view of the above circumstances, and its purpose is to provide a crushing device that can prevent crushed pieces from scattering outside the bucket. [Means for solving the problem]

[0007] According to one aspect of the present disclosure, A crushing device for crushing a structure, comprising: Fixed crushing arm, A movable crushing arm rotatably connected to the fixed crushing arm; a bucket suspended from the fixed crushing arm to receive crushed pieces falling outside the structure; a fence that is erected on the bucket and that catches broken pieces that tend to fly out of the bucket; A crushing device comprising:

[0008] Preferably, the fence comprises a fixed fence fixed to the bucket, and a movable fence provided at a side end of the fixed fence so as to be rotatable and adjustable in angle.

[0009] Preferably, the movable fences are provided on both side ends of the fixed fence.

[0010] Preferably, the bucket is suspended from the fixed crushing arm via a suspension member, The hanging member has an upper end portion rotatably connected to the fixed crushing arm and a lower end portion connected to the bucket, The fence has an opening for allowing access to the connection between the upper end of the hanging member and the fixed crushing arm, and a door for opening and closing the opening. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to prevent fragments from scattering outside the bucket. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram showing a dismantling system according to a basic embodiment. [Figure 2] FIG. 2 is a left side view showing the crushing device of the basic embodiment. [Figure 3] FIG. 2 is a front view showing the suspension member of the basic embodiment. [Figure 4] FIG. 4 is a front cross-sectional view showing a connection portion of the hanging member. [Figure 5] FIG. 2 is a left side view showing the crushing device of the present embodiment. [Figure 6] FIG. 2 is a front view showing the bucket and fence of the present embodiment. [Figure 7] FIG. 2 is a plan view showing the bucket and fence of the present embodiment. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the present disclosure is not limited to the following embodiments.

[0014] First, a basic embodiment that forms the basis of this embodiment will be described. Then, this embodiment will be described. This embodiment is a modification or improvement of part of the basic embodiment. Therefore, it should be noted that the remaining part of the basic embodiment forms a constituent element of this embodiment.

[0015] Fig. 1 shows a demolition system S according to a basic embodiment. The demolition system S is for demolishing structures, particularly tower-like structures such as chimneys made of reinforced concrete. The structure in this embodiment is a chimney E.

[0016] The upper end of the chimney E is crushed by the crushing device 100. The crushing device 100 is suspended by a wire 3 from the tip of a boom 2 of a traveling crane 1. The state of the work performed by the crushing device 100 is photographed by a camera 4 of the crushing device 100 and a camera 5 attached to the boom 2. Camera 4 will be described later. Camera 5 is a camera for photographing the state of the crushing work from a position higher and farther away than camera 4.

[0017] Meanwhile, in the driver's cab 6 of the crane 1, there is a television monitor 7 that displays images from cameras 4 and 5, and the driver watches this. Also, in the control room 8 on the ground, there is a television monitor 9 that displays images from cameras 4 and 5, and an operator watches this. The driver's cab 6 and the control room 8 are connected to each other via a communication device so that they can communicate with each other. The driver in the driver's cab 6 and the operator in the control room 8 watch the television monitors 7 and 9, respectively, and communicate with each other, operating the crane 1 and the crushing device 100 in cooperation with each other to carry out the crushing and demolition work.

[0018] Figure 2 shows a crushing device 100 according to a basic embodiment. For convenience, the front-rear, left-right, top-bottom directions are defined as shown in the figure. The front-rear and left-right directions are both horizontal and perpendicular to each other. The top-bottom direction is vertical and perpendicular to the front-rear and left-right directions.

[0019] The crushing device 100 comprises a base 10 suspended by a wire 3, a swivel base 11 attached to the base 10 so as to be rotatable about a rotation axis C1, a fixed crushing arm 12 attached to the swivel base 11, and a movable crushing arm 13 connected to the fixed crushing arm 12 so as to be rotatable about a rotation axis C2. The rotation axis C1 extends in the vertical direction, and the rotation axis C2 extends in the horizontal direction (specifically, left and right).

[0020] An on-board unit 14 is provided on the top surface of the gantry 10. The on-board unit 14 includes a hydraulic unit for driving hydraulic cylinders and the like (described below), a generator for generating the necessary power, and a wireless transceiver for transmitting video data from the camera 4 and receiving control signals from the operation room 8. The on-board unit 14 also includes a motor for rotating the swivel base 11 and a reducer for transmitting the motor's rotation to the swivel base 11. The output shaft of the reducer is arranged coaxially with the rotation axis C1, passes through the gantry 10, and is connected to the center of the swivel base 11. The swivel base 11 is formed in a disk shape in a plan view when viewed from above, and is rotatable along the underside of the gantry 10.

[0021] The fixed crushing arm 12 is suspended from the underside of the swivel base 11. In the illustrated example, the fixed crushing arm 12 extends from the rear (base end side) to the front (tip end side), and when viewed from the side (specifically, the left side), the tip end is bent downward at a right angle to form a substantially L-shape.

[0022] The rear end of the fixed crushing arm 12 is rotatably attached to the underside of the swivel base 11 by a support shaft 15. The support shaft 15 defines a rotation axis C3 extending in the left-right direction, and the fixed crushing arm 12 can rotate up and down, i.e., in the up-and-down direction, around this rotation axis C3. The rotation axis C3 is parallel to the rotation axis C2.

[0023] The front end of the fixed crushing arm 12 is connected to the underside of the swivel base 11 by a link 16 extending in the vertical direction. The upper end of the link 16 is rotatably attached to the underside of the swivel base 11 by a support shaft 17. The lower end of the link 16 is rotatably attached to the upper side of the fixed crushing arm 12 by a support shaft 18. The support shafts 17 and 18 define rotation axes C4 and C5 extending in the left-right direction, and the link 16 is rotatable about these rotation axes C4 and C5 relative to the swivel base 11 and the fixed crushing arm 12. The rotation axes C4 and C5 are parallel to the rotation axis C3. The fixed crushing arm 12 extends in a direction perpendicular to the rotation axis C3.

[0024] The movable crushing arm 13 extends downward from the fixed crushing arm 12 in a roughly C-shape when viewed from the side. The upper end of the movable crushing arm 13 is rotatably attached to a roughly middle part in the longitudinal direction (front-rear direction) of the fixed crushing arm 12 by a support shaft 19. This support shaft 19 defines the rotation axis C2 extending in the left-right direction, and the movable crushing arm 13 is rotatable in the front-rear direction around this rotation axis C2.

[0025] The movable crushing arm 13 is connected to the fixed crushing arm 12 at approximately its longitudinal (vertical) middle portion by a hydraulic cylinder 20 extending vertically. The upper end of the cylinder body of the hydraulic cylinder 20 is rotatably attached to the rear upper end of the fixed crushing arm 12 by a support shaft 21. The lower end of the piston rod of the hydraulic cylinder 20 is rotatably attached to the fixed crushing arm 12 at approximately its longitudinal middle portion by a support shaft 22. The support shafts 21 and 22 define rotation axes C6 and C7 extending in the left-right direction, and the hydraulic cylinder 20 is rotatable relative to the fixed crushing arm 12 and the movable crushing arm 13 around these rotation axes C6 and C7. The rotation axes C6 and C7 are parallel to the rotation axis C3. The movable crushing arm 13 also extends in a direction perpendicular to the rotation axis C3.

[0026] By extension and retraction of the hydraulic cylinder 20, the movable crushing arm 13 rotates in the front-rear direction around the rotation axis C2, moving toward or away from the fixed crushing arm 12. When the movable crushing arm 13 rotates forward (i.e., moves forward), the fixed crushing arm 12 and the movable crushing arm 13 pinch the wall at the top end of the chimney E and crush it. Note that the chimney E in the figure shows the position during crushing.

[0027] The fixed crushing arm 12 and the movable crushing arm 13 are respectively provided with vertical reinforcing bars (i.e., vertical bars) cutter and horizontal reinforcing bars (25, 26) cut horizontal reinforcing bars (i.e., horizontal bars) extend in the horizontal direction. These vertical reinforcing bar cutters 23, 24 and horizontal reinforcing bar cutters 25, 26 apply shear force to the vertical reinforcing bars and horizontal reinforcing bars, respectively, to cut the vertical reinforcing bars and horizontal reinforcing bars like scissors.

[0028] The crushing device 100 also includes a bucket 30 that is suspended from the fixed crushing arm 12 and receives crushed pieces that fall outside the chimney E.

[0029] The bucket 30 is suspended via a suspension member 32 from a bracket 31 that is integrally provided at the center of the left-right width of the front part of the fixed crushing arm 12. The lower end of the suspension member 32 is fixed integrally to the bucket 30. The upper end of the suspension member 32 is rotatably attached to the bracket 31 by a support shaft 33. The support shaft 33 defines a rotation axis C8 that extends in the left-right direction. The rotation axis C8 is parallel to the rotation axis C3. The suspension member 32 and the bucket 30 are integrally rotatable, i.e., swingable, in the front-rear direction around this rotation axis C8.

[0030] A seal member 34 that protrudes from the rear end of the bucket 30 seals the gap between the bucket 30 and the chimney E. The seal member 34 is formed of a flexible plate such as a rubber plate.

[0031] The bottom plate 35 of the bucket 30 is attached by a hinge 36 and can be opened and closed. The bucket 30 is provided with a hydraulic cylinder 37 for driving the bottom plate 35 to open and close. Normally, the hydraulic cylinder 37 is contracted as shown by the solid line, and the bottom plate 35 is closed. On the other hand, when the hydraulic cylinder 37 is extended as shown by the imaginary line, the bottom plate 35 opens and the crushed pieces in the bucket 30 are discharged and dropped. At this time, the crushing device 100 is moved by the crane 1, and the bucket 30 is positioned directly above the chimney E, and the crushed pieces are discharged and dropped into the chimney E.

[0032] The crushing device 100 also includes the camera 4 described above to capture images of the crushing process performed by the fixed crushing arm 12 and the movable crushing arm 13.

[0033] The camera 4 is attached to the tip of an L-shaped arm 38 attached to the swivel base 11, and is designed to capture images of the crushing operation from diagonally above and in front of the fixed crushing arm 12. In the illustrated example, the arm 38 extends forward from the swivel base 11, with its tip bent downward. The camera 4 is attached to this tip facing diagonally downward and rearward. The arm 38 and camera 4 are positioned at the center of the left-right width of the fixed crushing arm 12. Well-known optional mechanisms, such as a lens rotation mechanism for fine-tuning the lens orientation and a zoom mechanism, may be added to the camera 4.

[0034] FIG. 3 is a front view of the hanging member 32 in the crushing apparatus 100 of the basic embodiment, as viewed from the front. As shown in the figure, the hanging member 32 has a generally A-shaped or triangular, plate-like overall shape that is symmetrical from left to right. The hanging member 32 is configured by integrally connecting left and right side beams 39 with a cross beam 40, a front panel 41, and a rear panel (not shown). The side beams 39 and cross beam 40 are formed from square steel pipes, and the front panel 41 and rear panel are formed from steel plates, which are welded together. The left and right side beams 39 have a symmetrical shape, and the front panel 41 and rear panel have the same shape when viewed from the front. The front panel 41 and rear panel are welded to the front and rear portions of the left and right side beams 39 and cross beams 40, respectively, and close the space enclosed by the left and right side beams 39 and cross beams 40.

[0035] The lower ends of the side beams 39 are fixed by welding to the inner surfaces of the left and right side walls 42 of the bucket 30 at approximately the center of the front-to-rear width. The upper ends of the side beams 39 are rotatably attached to the brackets 31 of the fixed crushing arms 12 by means of support shafts 33.

[0036] 4 is an enlarged cross-sectional view showing a connection portion of the hanging member 32 to the bracket 31. The bracket 31 is formed from a steel plate and is arranged so that its front and back surfaces face in the left-right direction. A pair of brackets 31 is provided on the left and right.

[0037] The upper ends of left and right side beams 39, which are bent so as to be parallel in the vertical direction, are sandwiched and positioned between these brackets 31. A support shaft 33 made of a steel pin is inserted from the side through shaft holes 31A, 43 of the bracket 31 and side beam 39. A retaining pin 45 is inserted through pin holes 44 in the parts of the support shaft 33 that protrude on both the left and right sides of the bracket 31. This allows the hanging member 32 to be rotatably connected to the bracket 31 and, ultimately, to the fixed crushing arm 12. Appropriate means is provided to prevent the retaining pin 45 from coming out of the pin hole 44.

[0038] The bracket 31 and the hanging member 32 are positioned at the center of the left-right width of the fixed crushing arm 12 and the bucket 30.

[0039] As described above, the crushed pieces generated by crushing are generally dropped into the chimney E. In addition, the crushed pieces that have fallen to the outside of the chimney E are generally received by the bucket 30 that has been placed close to or in contact with the outer wall of the chimney E in advance.

[0040] However, during crushing, relatively small crushed pieces (for example, about 5 to 10 cm in diameter) may fly outside the bucket 30, and may not be able to be collected by the bucket 30 and may end up falling. Because crushing is performed at a height, it is preferable to prevent even these small crushed pieces from falling as much as possible.

[0041] Therefore, in this embodiment, a fence is provided to prevent the broken pieces from scattering outside the bucket 30. This embodiment will be described below.

[0042] This embodiment is based on the basic embodiment described above. In the following explanation, changes or improvements from the basic embodiment will be mainly explained, and explanations of the same parts will be basically omitted. For ease of understanding, components with the same names will be assigned the same reference numerals whenever possible, regardless of whether their configurations are different or the same.

[0043] Figure 5 shows a side view of the crushing device 100 of this embodiment, in contrast to Figure 2. As shown in the figure, the crushing device 100 of this embodiment is provided with a fence 50 that is erected on the bucket 30 and catches crushed fragments that tend to scatter outside the bucket 30.

[0044] 6 and 7(A), (B) are a front view and a plan view showing the bucket 30 and the fence 50. Fig. 7(A) is a plan view seen from a height position of VIIA-VIIA in Fig. 6, and Fig. 7(B) is a plan view seen from a height position of VIIB-VIIB in Fig. 6.

[0045] Fig. 8 is a schematic left-side cross-sectional view showing the bucket 30 and the fence 50, taken along line VIII-VIII in Fig. 6. For convenience, the seal member 34 is omitted from Figs. 6 to 8.

[0046] A shelf 51 is provided along the upper edge of the front surface of the bucket 30. A fence 50 is erected on this shelf 51. The fence 50 is placed upright on the shelf 51 and fixed to the shelf 51 with bolts, nuts, etc. (not shown).

[0047] The fence 50 includes a fixed fence 52 fixed to a shelf material 51 of the bucket 30, and a movable fence 53 rotatably and angle-adjustably attached to the side end of the fixed fence 52. The movable fences 53 are attached to both left-right end portions of the fixed fence 52.

[0048] The fence 50 also has an opening 54 for allowing access to the connection between the upper end of the hanging member 32 and the bracket 31 of the fixed crushing arm 12, and a door 55 for opening and closing the opening 54.

[0049] Hydraulic cylinders 37 that open and close the bottom plate 35 of the bucket 30 are disposed close to both the left and right outer sides of the bucket 30. Fixed fences 52 fixed to the shelf material 51 have a rectangular shape that is long in the horizontal direction when viewed from the front, and extend to the left and right up to positions above the left and right hydraulic cylinders 37.

[0050] The fixed fence 52 is constructed by assembling a plurality of vertical members 56 extending in the up-down direction and a plurality of horizontal members 57 extending in the horizontal (left-right) direction in a frame-like and lattice-like configuration to form a fixed fence frame, and attaching wire mesh 58 as a wall material to these vertical members 56 and horizontal members 57 so that it covers the entire fixed fence 52 except for the area around the opening 54. For example, the vertical members 56 and horizontal members 57 are made of shaped steel such as L-shaped steel, and the wire mesh 58 is made of a relatively fine-mesh wire mesh. The vertical members 56 and horizontal members 57 are assembled and the wire mesh 58 is attached using bolts and nuts.

[0051] The fixed fence 52 is also provided with a number of braces 59 of adjustable length to increase its strength.

[0052] The opening 54 is provided in the center of the left-right width of the fixed fence 52. The position of this opening 54 corresponds to the left-right positions of the bracket 31 and the hanging member 32, and is a position suitable for connecting them. The opening 54 has a rectangular shape that is long in the vertical direction. Two doors 55 that open and close like double doors are installed in this opening 54. Like the fixed fence 52, the doors 55 are configured by attaching wire mesh 58 to a door frame made of multiple vertical members 56 and horizontal members 57 assembled into a frame and lattice shape. The doors 55 are rotatably attached to the fixed fence 52 via hinges (not shown).

[0053] The movable fence 53 is configured in the same manner as the fixed fence 52. The movable fence 53 is configured by assembling multiple vertical members 56 and horizontal members 57 in a frame-like and lattice-like pattern to form a movable fence frame, and attaching wire mesh 58 to these vertical members 56 and horizontal members 57 so that it extends over the entire movable fence 53. The movable fence 53 is also provided with multiple braces 59.

[0054] The movable fence 53 has a rectangular shape with its width slightly longer than its height when viewed from the front, but its width is shorter than that of the fixed fence 52. The height of the movable fence 53 is the same as that of the fixed fence 52, and the positions of the upper and lower ends of the movable fence 53 and the fixed fence 52 are the same.

[0055] The direction toward the width center O1 of the fixed fence 52 in the left-right direction is referred to as the widthwise inner side, and the direction away from the width center O1 of the fixed fence 52 is referred to as the widthwise outer side.

[0056] The inner edge portions (vertical members 56) in the width direction of the left and right movable fences 53 are each rotatably connected to the outer edge portions (vertical members 56) in the width direction of the fixed fence 52 by multiple (four) hinges 60. The hinges 60 define a rotation axis C9 that extends in the vertical direction, and the movable fence 53 can rotate relative to the fixed fence 52 around this rotation axis C9.

[0057] The angle θ formed by an extension line a in the left-right direction of the reference position (front surface in this embodiment) of the fixed fence 52 in a plan view (FIGS. 7(A) and (B)) and the reference position (front surface in this embodiment) of the movable fence 53 is defined as the closing angle of the movable fence 53. An adjustment mechanism for adjusting the closing angle θ of the movable fence 53 is provided on the fence 50.

[0058] The closing angle θ of the movable fence 53 is changed according to the diameter in plan view of the chimney E, which is the object to be crushed. The larger the diameter of the chimney E, the smaller the closing angle θ is made.

[0059] The adjustment mechanism has a top adjustment mechanism 61 located at the top of the fence 50 as shown in Figure 7(A), and a bottom adjustment mechanism 62 located at the bottom of the fence 50 as shown in Figure 7(B). The top adjustment mechanism 61 and the bottom adjustment mechanism 62 are both provided for the left and right movable fences 53. The left and right top adjustment mechanisms 61 and bottom adjustment mechanisms 62 are both symmetrical in structure.

[0060] 7 shows the left and right movable fences 53, top adjustment mechanism 61, and bottom adjustment mechanism 62 by imaginary lines when the movable fence 53 rotates rearward from the reference position (position of minimum closing angle) of θ=0° and the closing angle θ becomes 45°. The following explanation will mainly use the components shown by the imaginary lines.

[0061] The right-side top adjustment mechanism 61 includes a link bar 63 arranged on the top edge (cross member 57) of the fixed fence 52. The inner end of the link bar 63 in the width direction is connected to the top edge (cross member 57) of the fixed fence 52 by a connector 80 such as a bolt or pin that extends vertically. Note that a hole is provided in the top edge (cross member 57) of the fixed fence 52 for attaching the connector 80 (and the same applies below).

[0062] The outer ends of the link bars 63 in the width direction are connected to the top edge (cross member 57) of the movable fence 53 by connectors 65 extending in the vertical direction, thereby fixing the closing angle θ of the movable fence 53. The fixed fence 52, movable fence 53 and link bars 63 form a truss structure, and the movable fence 53 is firmly fixed at a constant closing angle θ.

[0063] When the closing angle θ is greater than zero, the movable fence 53 and link bar 63 are connected by another intermediate link bar 64. This forms an additional truss structure, further strengthening the fixation of the closing angle θ. Both ends of the intermediate link bar 64 are connected to the movable fence 53 and link bar 63 by connectors 64A.

[0064] When the closing angle θ is changed, the link bar 63 is replaced with another link bar 63 having a different length. For example, when the closing angle θ is made smaller than the illustrated example, the link bar 63 is replaced with another link bar 63 that is longer than the illustrated example.

[0065] Similarly, the intermediate link bar 64 is replaced with another intermediate link bar 64 having a different length. For example, when the closing angle θ is made smaller than in the illustrated example, the intermediate link bar 64 is replaced with another intermediate link bar 64 that is shorter than in the illustrated example.

[0066] When the movable fence 53 is in the reference position of θ=0°, the movable fence 53 and the fixed fence 52 are aligned in a straight line in a plan view, as shown by the solid line in Figure 7, and the link bar 63 is placed on them, with its tip connected to the movable fence 53.

[0067] The left bottom adjustment mechanism 62 is equipped with a link bar 66 that extends in the left-right direction and connects the bucket 30 and the movable fence 53. The inner end of the link bar 66 in the width direction is connected to the upper edge and rear end of the left side surface of the bucket 30 by a connector 81 that extends in the up-down direction.

[0068] The outer ends of the link bars 66 in the width direction are connected to the bottom edge (cross members 57) of the movable fence 53 by connectors 68 extending in the vertical direction. This fixes the closing angle θ of the movable fence 53. The integrated fixed fence 52 and bucket 30, the movable fence 53, and the link bars 66 form a truss structure, and the movable fence 53 is firmly fixed at a constant closing angle θ.

[0069] A tab 69A protruding rearward is provided at the bottom edge of the movable fence 53. A tab hole 69 is formed in the tab 69A. By inserting a connector 68 into the tab hole 69, the outer end of the link bar 66 in the width direction is connected to the tab 69A.

[0070] When the closing angle θ is greater than zero, the movable fence 53 and link bar 66 are connected by another intermediate link bar 67 extending in the front-to-rear direction. This forms an additional truss structure, further strengthening the fixation of the closing angle θ. Both ends of the intermediate link bar 67 are connected by a connector 67A. At the bottom edge (cross member 57) of the movable fence 53, a tab hole 70 is provided in another tab 70A, widthwise inward of the tab 69A and tab hole 69. The front end of the intermediate link bar 67 is connected to another tab 70A by the connector 67A and tab hole 70.

[0071] When the closing angle θ is changed, the link bar 66 is replaced with another link bar 66 having a different length. For example, when the closing angle θ is made smaller than the illustrated example, the link bar 66 is replaced with another link bar 66 that is longer than the illustrated example.

[0072] Similarly, the intermediate link bar 67 is replaced with another intermediate link bar 67 having a different length. For example, when the closing angle θ is made smaller than in the illustrated example, the intermediate link bar 67 is replaced with another intermediate link bar 67 that is shorter than in the illustrated example.

[0073] When the movable fence 53 is in the reference position of θ=0°, the movable fence 53 and the fixed fence 52 are aligned in a straight line in a plan view, and the link bar 66 is positioned below the bottom surface of the movable fence 53 or along the bottom surfaces of the movable fence 53 and the fixed fence 52, with its tip connected to the movable fence 53 or the fixed fence 52.

[0074] As shown in Figure 8, to prevent the fence 50 from falling over, a stop bar or inclined support member 71 is provided to connect the fence 50 and the bucket 30. In this embodiment, an upwardly protruding bracket 72 is provided on the upper edge and rear of each of the left and right side surfaces (only the left side is shown) of the bucket 30. A bracket 73 is also provided on the vertical member 56A (see Figure 6) of the fixed fence 52 that is aligned with and located in front of the left and right side surfaces of the bucket 30 in a plan view. The bracket 73 is provided on the rear side or back surface and upper end of the vertical member 56A. Both ends of the inclined support member 71 are fixed to these brackets 72, 73 with bolts or the like.

[0075] Next, the effects of this embodiment will be described.

[0076] 5, if relatively small fragments H attempt to fly outside the bucket 30 during crushing operation, the fragments H will collide with the fence 50 and be caught by the fence 50. Therefore, it is possible to reliably prevent the fragments H from flying outside the bucket 30.

[0077] The broken pieces H fall after colliding with the fence 50. Since the bucket 30 is positioned directly below the fixed fence 52 across almost the entire width on both sides, almost all of the broken pieces H that collide with the fixed fence 52 and fall fall into the bucket 30 and are collected.

[0078] On the other hand, since the bucket 30 is not positioned directly below the movable fence 53, the fragments H that collide with the movable fence 53 and fall are usually not collected by the bucket 30, but fall into the gap between the movable fence 53 and the chimney E. However, even then, they only fall onto the ground in the vicinity of the chimney E, and since sufficient safety measures are in place on the ground, there is no particular problem in terms of safety.

[0079] In addition, scattered fragments H can also be caught by the plate-shaped hanging members 32 and dropped into the bucket 30 for collection. However, the shape of the hanging members 32 in a front view is relatively small, and the effect of the hanging members 32 in preventing fragments from scattering is limited. In this embodiment, a fence 50 is provided whose area in a front view is much larger than that of the hanging members 32. Therefore, the effect of preventing fragments H from scattering can be significantly improved compared to the basic embodiment.

[0080] The crushing device 100 of this embodiment is equipped with a movable fence 53 that is rotatably and angle-adjustably attached to the side end of the fixed fence 52. By providing such a movable fence 53, the angle of the movable fence 53, i.e., the closing angle θ, can be adjusted according to the outer diameter of the chimney E. For example, if the outer diameter of the chimney E is large, the closing angle θ of the movable fence 53 can be made smaller. This allows the shape of the fence 50 in a plan view to match the shape of the chimney E. This also makes it possible to minimize the gap between the movable fence 53 and the chimney E, further suppressing the scattering of crushed fragments H outside the bucket 30.

[0081] As shown in FIG. 1, the chimney E is formed with a slight taper, with its diameter increasing toward the bottom. Meanwhile, the crushing operation proceeds from top to bottom, and the diameter of the chimney E gradually increases during the crushing operation. In this embodiment, the angle of the movable fence 53, i.e., the closing angle θ, can be adjusted in accordance with this change in diameter. In other words, as the diameter of the chimney E increases during the crushing operation, the closing angle θ can be gradually reduced. This allows the angle of the movable fence 53 to be optimally set in accordance with changes in the diameter of the chimney E.

[0082] The movable fences 53 are provided on both end portions of the fixed fence 52. This allows the left and right movable fences 53 to reliably catch the fragments H that tend to scatter to the left and right sides of the fixed fence 52. In addition, the left and right weight balance of the fence 50 can be improved compared to when the movable fence 53 is provided on only one side end portion of the fixed fence 52.

[0083] The fence 50 of this embodiment has an opening 54 for allowing access to the connection between the upper end of the hanging member 32 and the bracket 31 of the fixed crushing arm 12, and a door 55 for opening and closing the opening 54. This makes it easy to connect the hanging member 32 and the bracket 31.

[0084] Specifically, during the connection work, the bucket 30 with the fence 50 attached is placed on the ground, and the door 55 is opened to open the opening 54. Then, scaffolding is created using a stepladder or the like on the ground in front of the opening 54 and inside the bucket 30 behind the opening 54. Next, the crushing device 100 is lowered, the fixed crushing arms 12 are brought close to the hanging members 32, and the brackets 31 are aligned with the upper ends of the hanging members 32.

[0085] In this state, a worker stands on the scaffold and performs the connection work. Because of the opening 54, the connection part near and behind the fence 50 can be accessed even from the front of the fence 50, which makes the connection work easier.

[0086] After the connection work is completed, the door 55 and the opening 54 are closed, and the door 55 is locked. As a result, during the crushing work, scattered crushed pieces can be caught by the door 55 and collected in the bucket 30.

[0087] Although the embodiments of the present disclosure have been described in detail above, various other embodiments and modifications of the present disclosure are possible.

[0088] For example, when adjusting the angle of the movable fence 53, instead of or in addition to replacing the link bars 63, 66 with ones of a different length, the connection positions of the link bars 63, 66 may be changed. In this case, the component to which the link bars 63, 66 are connected is provided in advance with multiple holes into which connectors can be inserted. By selecting the most appropriate one of these holes, it is possible to adjust the angle while still using the same link bars 63, 66. The same applies to the intermediate link bars 64, 67.

[0089] The door 55 does not necessarily have to be a hinged type, but may be a detachable type or the like.

[0090] The structure does not have to be a tower-like structure such as a chimney, and may be any structure.

[0091] In the above embodiment, the fixed crushing arm 12 and the movable crushing arm 13 are attached to the swivel base 11 that can rotate relative to the base 10. However, such a swivel configuration is not necessarily required, and the fixed crushing arm 12 and the movable crushing arm 13 may be attached directly to the base 10. The same applies to the camera 4.

[0092] The embodiments of the present disclosure are not limited to the above-described embodiments, and all modifications, applications, and equivalents encompassed within the spirit of the present disclosure as defined by the claims are included in the present disclosure. Therefore, the present disclosure should not be interpreted as being limited, and can be applied to any other technology that falls within the spirit of the present disclosure. [Explanation of symbols]

[0093] 12 Fixed Crushing Arm 13 Movable crushing arm 30 buckets 32 Hanging member 50 Fence 52 Fixed Fence 53 Movable Fence 54 Opening 55 Door 100 Crushing equipment E. Chimney

Claims

1. A crushing device for crushing a structure, comprising: Fixed crushing arm, A movable crushing arm rotatably connected to the fixed crushing arm; a bucket suspended from the fixed crushing arm to receive crushed pieces falling outside the structure; a fence that is erected on the bucket and that catches broken pieces that tend to fly out of the bucket; A crushing device comprising:

2. The fence includes a fixed fence fixed to the bucket and a movable fence rotatably and angle-adjustably provided at a side end of the fixed fence. The crushing device according to claim 1.

3. The movable fences are provided on both side ends of the fixed fence. The crushing device according to claim 2.

4. The bucket is suspended from the fixed crushing arm via a suspension member, The hanging member has an upper end portion rotatably connected to the fixed crushing arm and a lower end portion connected to the bucket, The fence has an opening for allowing access to a connection between the upper end of the hanging member and the fixed crushing arm, and a door for opening and closing the opening. The crushing device according to claim 1.

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