JP2016017285A - Scattering prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scattering prevention device capable of preventing upward scattering of debris by a simple configuration, without making a scattering prevention sheet higher than necessary or requiring a work machine such as a juxtaposed crane, when a building is demolished.SOLUTION: An arm 15 of a working front of a demolition machine is provided with an attachment frame 26. A cover frame 33 is attached in such a manner as to be capable of longitudinally rotating by a hydraulic cylinder 41 on a pivot shaft 39 provided in the attachment frame 26. Cover materials 34-36 are attached to the cover frame 33. In an attitude in which the cover frame 33 is rotated forward, a crushing tool 19 attached to the arm 15 is covered with the cover materials 34-36 from an upper side thereof.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a shatter prevention device for preventing scattered matter such as bolts and rivets generated at the time of dismantling of a building from splashing beyond a shatter prevention sheet provided around the dismantling site, in particular a concrete building. It is related with the thing suitable when applying to the dismantling work of.

  When dismantling a concrete building, for example, as described in Patent Document 1, a saddle-like crushing tool is attached to the tip of an arm of a self-propelled working machine, and the crushing tool is used to crush the concrete. Disconnect. As a work form for performing such a dismantling work, there is a form in which a dismantling machine is placed on a concrete building and the dismantling is sequentially performed from an upper floor to an adjacent floor below it. When such a dismantling operation is performed, there are cases where a coupling tool such as a bolt or a rivet used for coupling steel frames is scattered. For this reason, the concrete structure to be demolished is surrounded by a scattering prevention sheet to prevent scattering. Such a scattering prevention sheet is provided so that the top thereof is higher than the floor dismantled at that time.

  However, in some cases, in order to prevent the scattered matter from jumping over the anti-scattering sheet even when the scattered object scattered by the dismantling work has flown upward, a measure to increase the anti-scattering sheet has been adopted in the past. . As another measure, a crane other than the demolition machine is placed on the floor where the demolition work is being performed, a cover is suspended from the boom of the crane, and the dismantling is performed while covering the crushing tool of the demolition machine with the cover. Work was done.

Japanese Patent Laid-Open No. 7-4072

  However, as one measure for preventing the scattered matter from exceeding the anti-scattering sheet as in the prior art, when the anti-scattering sheet is made higher, the support supporting the anti-scattering sheet is made higher, or a larger number of sheets It is necessary to stretch the anti-scattering sheet, and a great deal of labor and time are required to construct and remove the anti-scattering sheet. On the other hand, when a crane is juxtaposed to the dismantling machine and the cover suspended by the crane is moved in accordance with the movement of the crushing tool, a crane is required in addition to the dismantling machine, and a crane operator is also required. For a trader, at least two work machines and their operators are required, which increases the burden. In addition, the work performed by juxtaposing two work machines is likely to cause interference between the work machines, resulting in difficulty in the work.

  In view of the above-mentioned problems, the present invention eliminates the need for an anti-scattering sheet that is unnecessarily high, or requires a working machine such as a crane to be placed side by side with a simple configuration. An object of the present invention is to provide a scattering prevention device capable of preventing scattering.

The scattering prevention device according to claim 1 is:
A mounting frame provided on the arm at the tip of the work front of the demolition machine,
A cover frame that is pivotably mounted in the front-rear direction by a drive device around a pivot shaft provided in the mounting frame;
A cover material that is attached to the cover frame and covers the crushing tool attached to the arm from above in a posture in which the cover frame is rotated forward is provided.

The scattering prevention device according to claim 2 is the scattering prevention device according to claim 1,
The cover frame to which the cover material is attached has a configuration in which the lateral width can be changed.

The scattering prevention device according to claim 3 is the scattering prevention device according to claim 1 or 2,
The cover frame to which the cover material is attached has a configuration in which the front-rear width can be changed.

The scattering prevention device according to claim 4 is the scattering prevention device according to any one of claims 1 to 3,
The cover frame is rectangular,
As the cover material, comprising an upper surface cover material provided on the upper surface of the cover frame, a side cover material provided on the side surface of the cover frame, and a front cover material provided on the front surface of the cover frame,
The upper surface cover material is configured using a net.

The scattering prevention device according to claim 5 is the scattering prevention device according to any one of claims 1 to 4,
The cover frame is rectangular,
As the cover material, comprising an upper surface cover material provided on the upper surface of the cover frame, a side cover material provided on the side surface of the cover frame, and a front cover material provided on the front surface of the cover frame,
Among the side cover materials, at least a side cover material that may be interposed between the cab and the crushing tool is configured using a net.

  According to the first aspect of the present invention, the cover material for preventing the scattered matter from being scattered upward is attached to the front arm of the dismantling machine. It is not necessary to provide a crane for prevention. For this reason, the burden on human and dismantling facilities in the dismantling work is reduced.

  In addition, since the anti-scattering device is attached to the arm, the cover material can be automatically positioned on the crushing tool, and the position adjustment of the cover material is not required as in the case of using a crane, and the operation becomes easy. . Further, since it is not necessary to place a crane in addition to the dismantling machine, there is no interference between the crane and the dismantling machine, and the dismantling work is facilitated.

  In addition, since the cover frame to which the cover material is attached can be rotated back and forth, if there is no concern about the flying object flying upward, the cover frame is retracted backward to facilitate disassembly work. .

  According to the invention of claim 2, since the left and right width of the cover frame to which the cover material is attached can be changed, the work can be performed in a work posture suitable for the site by performing the work with the left and right width according to the situation of the site. The Further, by reducing the left and right width during transportation, it becomes easier to clear the transportation restriction width.

  According to the invention of claim 3, since the front-rear width of the cover frame can be changed, the front-rear width of the anti-scattering device can be reduced during transportation and storage so that the cover frame can be transported and stored in a compact posture. .

  According to the invention of claim 4, since the upper surface cover material is configured by using the net, it is possible to prevent the upper surface cover material from being lifted by wind.

  According to the invention of claim 5, since the side cover material that may be interposed between the cab and the crushing tool is configured using a net, the crushing tool can be visually observed from the operator of the dismantling machine, The cover material does not interfere with visual inspection of the crushing part.

It is a side view of the demolition machine which shows one Embodiment of the scattering prevention apparatus of this invention. It is a side view which shows the state which attached the scattering prevention apparatus of this Embodiment to the arm. It is a top view which shows the scattering prevention apparatus main body of this Embodiment. It is a front view which shows the scattering prevention apparatus main body of this Embodiment. It is a side view shown in the state where the cover frame of the scattering prevention device of this embodiment was stored behind the arm. FIG. 6 is a plan view of FIG. 5. It is a side view shown in the state where the cover frame of the scattering prevention device of this embodiment was expanded. It is sectional drawing which shows the attachment structure of the horizontal frame with respect to the main frame of the cover frame of the scattering prevention apparatus of this Embodiment. It is sectional drawing which shows the attachment structure of the extended side frame with respect to the side frame of the cover frame of the scattering prevention apparatus of this Embodiment. (A) is an exploded side view showing the attachment structure of the extension main frame to the main frame of the cover frame of the scattering prevention device of the present embodiment, (B) is a side view showing a state in which the extension main frame is coupled to the main frame. FIG. It is a top view of FIG. It is sectional drawing which shows the attachment structure of the upper surface cover material with respect to the cover frame of this Embodiment. It is sectional drawing which shows the attachment structure of the side cover material of this Embodiment, and a front cover material. It is sectional drawing which shows the attachment structure of the front surface and side cover material of this Embodiment.

  FIG. 1 is a side view showing a dismantling machine showing an embodiment of the scattering prevention device of the present invention in a working state. In FIG. 1, 1 is a demolition machine, 2 is the floor surface in the concrete building currently demolished. Reference numeral 3 denotes a scatter prevention sheet for preventing scattered objects such as bolts, rivets and the like from being scattered around during the dismantling work by the dismantling machine 1. 3a is a scattering prevention sheet located in front of the dismantling machine 1, and 3b is a scattering prevention sheet located on the side of the dismantling machine 1. As shown in the figure, these scattering prevention sheets 3 a and 3 b are installed so as to be higher than the dismantling machine 1.

  The demolition machine 1 has a swivel frame 7 installed on a crawler-type lower traveling body 5 via a swivel device 6, and a hydraulic power unit 8 including a hydraulic pump driven by a prime mover and a cab 9 are placed on the swivel frame 7. It is installed and constructed by attaching a work front 10 to the revolving frame 7.

  The work front 10 includes a boom 13 attached to the revolving frame 7 by a hydraulic cylinder 12 so as to be able to move up and down, an arm 15 attached to the boom 13 so as to be vertically rotatable by a hydraulic cylinder 14, and a hydraulic cylinder 16 attached to the arm 15. The crushing tool 19 is mounted so as to be pivotable in the vertical direction via links 17 and 18 for increasing the rotation angle.

  As shown in the side view of FIG. 2, the crushing tool 19 is attached to a bracket 21 that is rotatably attached to the arm 15, a turning device 22 attached to the bracket 21, and a swiveled side of the turning device 22. And the crushing tool main body 23. The crushing tool main body 23 includes a pair of crushing claws 23a, a hydraulic cylinder 23b for opening and closing the crushing claw 23a, and a cutter 23c for cutting a steel frame or the like attached to the root part of the crushing claw 23a.

  Reference numeral 25 denotes a scattering prevention device attached to the arm 15 according to the present invention, and 26 denotes a mounting frame of the scattering prevention device 25. The mounting frame 26 also serves to protect the hydraulic cylinder 16 that rotates the crushing tool 19 from scattered matter. The mounting frame 26 includes a side frame portion 26 a and an upper frame portion 26 b and has a structure that covers the hydraulic cylinder 16. The mounting frame 26 is fixed to the bracket 27 provided on the both side surfaces of the arm 15 with bolts 28 and the rear end portion of the upper frame portion 26 b is provided on the arm 15 for mounting the hydraulic cylinder 16. Attached to the bracket 29 with bolts (not shown) or the like.

  Reference numeral 31 denotes a bracket fixed to the front portion of the upper frame portion 26b of the mounting frame 26 by welding or the like. 32 is an anti-scattering device main body, and as shown in the side view of FIG. 2, the plan view of FIG. 3, and the front view of FIG. An upper surface cover member 34 that covers the upper surface of the cover frame 33, side cover members 35 and 36 that are provided in a suspended manner on the side surface of the cover frame 33, and a front cover member 37 that is provided in a suspended manner on the front surface of the cover frame 33.

  As shown in FIG. 3, the cover frame 33 includes a pair of main frames 38 that are provided at the center in the left-right direction of the arm 15 and are formed long in the front-rear direction. As shown in FIG. 2, the main frame 38 is attached to a bracket 31 fixed to the front portion of the attachment frame 26 so as to be pivotable in the front-rear direction as indicated by an arrow 40 around a pivot shaft 39.

  Reference numeral 41 denotes a hydraulic cylinder provided as a drive device that rotates the scattering prevention device main body 32. The head side of the hydraulic cylinder 41 is connected by a pin 43 to a bracket 42 welded to the rear end portion of the mounting frame 26. The rod side end of the hydraulic cylinder 41 is commonly connected to one end of each of the links 45 and 46 for increasing the rotation angle by a pin 44, and the other end of the link 45 is connected to the bracket 31 by a pin 47. The other end of the link 46 is connected to a boss 38a (see FIG. 3) provided on the main frame 38 by a pin 48.

  Due to such a configuration, when the hydraulic cylinder 41 is extended, the main body 32 of the anti-scattering device can be positioned above the crushing tool 19 as shown by the solid line in FIG. Further, when the hydraulic cylinder 41 is extended most, the side cover members 35 and 36 can be positioned on the side of the crushing tool 19 and the front cover member 37 can be positioned on the front surface of the crushing tool 19.

  In this way, if the scattering prevention device main body 32 is positioned on the upper side of the crushing tool 19 so as to cover the crushing tool 19, among the scattered matter such as bolts and rivets generated in the dismantling work using the crushing tool 19, What goes up hits the cover materials 34-37. For this reason, it is possible to prevent the scattered matter from jumping over the anti-scattering sheet 3.

  On the other hand, when the hydraulic cylinder 41 is contracted, as shown by a two-dot chain line in FIG.

  When carrying out the present invention, the cover frame 33 may be configured as a frame having a fixed structure in which the left-right width and the front-rear width cannot be changed. It is said. Next, a mechanism for changing the width will be described.

  FIG. 5 is a partial cross-sectional side view showing only the cover frame 33 in the scattering prevention device main body 32, with the cover frame 33 in the retracted posture and omitting a side frame 51 described later. FIG. 6 is a plan view showing a state in which not only the front-rear width but also the left-right width is reduced. The main frame 38 has a square cross-sectional shape. As shown in FIG. 5, the main frame 38 has a plurality of (three in the illustrated example) rectangular openings 38b with a space in the front-rear direction. Is provided. Two horizontal frames 50 each having a rectangular cross section are fitted into each opening 38b so as to be slidable in the left-right direction. As shown in FIG. 6, a common side frame 51 is fixedly attached to the outer ends in the left-right direction of the plurality of horizontal frames 50 by welding or the like.

  As shown in FIG. 6, each horizontal frame 50 has a plurality of through holes 50 a for fixing to the main frame 38, and the main frame 38 also has a plurality of through holes 38 c for fixing the horizontal frame 50. . Further, in the reduced state of the left and right widths shown in FIG. 6 and the enlarged state of the left and right widths shown in FIG. 7, the through holes 50a provided in the horizontal frame 50 are respectively fixed so that the horizontal frame 50 can be fixed to the main frame 38. It is provided at a plurality of locations corresponding to the reduced and enlarged states of the left and right widths.

  As shown in FIG. 8, the horizontal frame 50 is fixed to the main frame 38 by inserting bolts 52 into the through holes 38 c provided in the main frame 38 and the through holes 50 a provided in the horizontal frame 50 and screwing into the nuts 53. This is done by fastening.

  As shown in the cross-sectional views of FIGS. 6, 7 and 9, the side frame 51 welded to the end of the horizontal frame 50 has a rectangular cross-sectional shape, and the expansion side frame 55 is slidably fitted therein. . As shown in FIG. 6, the expanded side frame 55 is accommodated in the side frame 51, and the expanded side frame 55 is pulled out from the side frame 51 as shown in FIG. It is configured so that a state in which the front-rear width is enlarged can be taken. The side frame 51 is provided with a through hole 51a for fixing the extended side frame 55 to the side frame 51. As shown in FIG. 7, the extended side frame 55 also has a through hole 55a for fixing to the side frame 51. Provide.

  Then, as shown in FIG. 6, in the contracted state in which the extended side frame 55 is accommodated in the side frame 51 and in the expanded state in which the extended side frame 55 is pulled out as shown in FIG. The expansion side frame 55 is fixed to the side frame 51 by being inserted into the through hole 51a of the 51 and the through hole 55a of the expansion side frame 55, screwed into the bolt 58, and fastened.

  In FIG. 5, reference numeral 60 denotes an extended main frame for extending the front-rear width of the cover frame 33, and is provided corresponding to each main frame 38. Reference numeral 60e denotes a left and right extended main frame 60, 60 is a combined frame in which the tips are combined. As shown in the side view of FIG. 10 (A), in order to attach the extended main frame 60 to the main frame 38, a bracket 61 is welded to the opposite side of the main frame 38 from the pivotal attachment side by the pivotal attachment shaft 39. A pivot attachment hole 61a for pivotally attaching the extension main frame 60 to each bracket 61, a retracted posture in which the extension main frame 60 is shown by a two-dot chain line in FIG. 10B, and a solid line in FIG. 10B. Fixing holes 61b and 61c for fixing in the extended posture are provided. On the other hand, a bracket 60b having a pivot attachment hole 60a and a bracket 60d having a fixing hole 60c for fixing the extension main frame 60 to the main frame 38 are welded to the expansion main frame 60.

  10B, the bracket 60b of the extended main frame 60 is aligned with the bracket 61 of the main frame 38, the shaft 62 is inserted into the pivot holes 60a and 61a, and the extended main frame is attached to the main frame 38. 60 is rotatably attached as indicated by arrow 66. As shown by a solid line in FIG. 10B, when the extended main frame 60 is in the extended posture on the extension of the main frame 38, the fixing hole 60c of the extended main frame 60 is aligned with the fixing hole 61c of the bracket 61. The expansion main frame 60 is fixed with bolts 67 and nuts 68 (see FIG. 11). Further, as shown by a two-dot chain line in FIG. 10B, when the extended main frame 60 is folded onto the main frame 38 to be in the retracted posture, the fixing hole 61b of the extended main frame 60 is fixed to the fixing hole 61b of the bracket 61. The expansion main frame 60 is fixed to the main frame 38 with bolts 67 and nuts 68.

  As shown in FIGS. 6 and 7, a side surface of the free end of the extended main frame 60 is provided with a bracket 69 projecting sideways. As shown in FIGS. 10 (A), 10 (B) and FIG. A reinforcing frame 73 connected to the expansion side frame 55 is pivotally attached to 69 around the shaft 71. As shown in FIG. 6, coupling holes 55 b and 73 a are provided at the respective ends of the expansion side frame 55 and the reinforcing frame 73. Then, in the state where the cover frame 33 is expanded as shown in FIG. 7, the bolts 74 are inserted into the holes 55b and 73a, and nuts (not shown) are screwed and fastened to fix the tip of the reinforcing frame 73. It connects with the tip of the extended side frame 55.

  FIG. 3 shows a state in which the upper surface of the cover frame 33 is covered with the upper surface cover member 34 in a state where the cover frame 33 is expanded into a rectangle as shown in FIG. In this example, an example in which the upper surface of the cover frame 33 is covered with three upper surface cover members 34 is shown. Each upper surface cover member 34 is configured by providing three openings 34b in a plate-like main member 34a and attaching a single mesh (mesh) 34c to the main member 34a. Thus, the reason why the mesh 34c is used for the upper surface cover material 34 is to prevent the cover material from being lifted by wind. The entire upper surface cover member 34 may be constituted by a net.

  Reference numeral 34 d denotes an attachment hole for attaching the upper surface cover member 34 to the horizontal frame 50, the side frame 51, and the reinforcing frame 73. Each attachment hole 34d is provided as a pair at a position where the main material 34a straddles the horizontal frame 50, the side frame 51, and the reinforcing frame 73. As shown in FIG. 12, the top cover member 34 is attached to the horizontal frame 50, the side frame 51, and the reinforcing frame 73 by tying a string 75 through the attachment hole 34d. The string 75 may be fastened by providing a coupling tool at both ends of the string 75 and detaching the string 75 by one-touch coupling or removal. Further, a bolt is projected upward on the upper surface of the main frame 38, the extended main frame 60 or the horizontal frame 50, the side frame 51, the reinforcing frame 73, etc., and the bolt is passed through the hole of the upper surface cover member 34, and the bolt is a nut. The upper surface cover member 34 may be fixed by screwing.

  The side cover members 35 and 36 shown in FIG. 2 are both provided to hang from the side frame 51 and the extended side frame 55. Of these side cover members 35, 36, the four rear side cover members 35 are provided with an opening 35 b in a plate-like main member 35 a, similarly to the upper cover member 34, similarly to the upper cover member 34. And a net 35c is attached to cover the opening 35b. Thus, the side cover member 35 provided with the net 35 c is interposed between the cab 9 and the crusher 19 of the dismantling machine 1 when the side cover member 35 is located on the side surface of the crusher 19. That is, the net 35c is used so that the operator of the dismantling machine can visually check the state of crushing by the crushing tool 19. The front side cover member 36 is made of a sheet, plate, cloth or the like. The front side cover member 36 may also be configured by using a net in the same manner as the side cover member 35.

  FIG. 13 is a cross-sectional view showing an example of the attachment structure of the side cover member 35 to the side frame 51 and the attachment structure of the front cover member 37 to the reinforcing frame 73. The bolts 77 are welded to the side frames 51 and the reinforcing frames 73, the mounting holes 78 provided in the cover members 35 and 37 are fitted into the bolts 77, and the nuts 79 are screwed into the bolts 77, whereby the cover members 35, 37 is fixedly attached.

  FIG. 14 is a cross-sectional view showing an example of a structure for attaching a part of the side cover member 35 and the front side cover member 36 to the expansion side frame 55. This is achieved by embedding and fixing a nut 80 in the expansion side frame 55, inserting a bolt 82 through a mounting hole 81 provided in the cover material 35, 36 and screwing it into the nut 80, thereby attaching the cover material 35, 36 to the expansion side. It is attached to the frame 55.

  As described above, the scattering prevention device 25 according to the present embodiment is provided with the attachment frame 26 on the arm 15 at the tip of the work front 10 of the dismantling machine 1, and the cover frame 33 is attached to the attachment frame 26. Since the cover materials 34 to 37 for preventing the scattered matter generated during the dismantling work from being scattered upward are attached to the frame 33, it is not necessary to provide a crane to prevent the scattered matter, and a scattering prevention sheet is also necessary. There is no need to make it higher. For this reason, the burden on human and dismantling facilities for the dismantling contractor is reduced.

  Further, since the anti-scattering device 25 is attached to the arm 15, the cover members 34 to 37 can be automatically positioned at the anti-scattering position on the crushing tool 19, and the cover member as in the case where a crane is used is used. An operation for position adjustment is not necessary, and the operation becomes easy. Moreover, since it is not necessary to place a crane in addition to the demolition machine of the anti-scattering device, there is no interference between the crane and the demolition machine, and the demolition work is facilitated.

  In addition, since the scattering prevention device main body 32 made up of the cover frame 33 and the cover materials 34 to 37 can be rotated back and forth, the scattering prevention device main body 32 is moved rearward when there is no fear of flying scattered objects upward. By retracting, dismantling work is facilitated.

  In the present embodiment, since the left and right widths of the cover frame 33 to which the cover members 34 to 37 are attached can be changed, the work posture suitable for the site can be obtained by performing the work with the left and right widths according to the situation on the site. Can do the work. For example, when the space on the right side (left side) of the crushing tool 19 is narrow, the expansion of the cover frame 33 to the right side (left side) can be stopped and only the left side (right side) can be expanded. Further, by reducing the left and right width during transportation, it becomes easier to clear the transportation restriction width.

  In the present embodiment, since the front-rear width of the cover frame 33 can be changed, the front-rear width of the anti-scatter device 25 can be reduced during transportation and storage so that the cover frame 33 can be transported and stored in a compact posture. .

  In the present embodiment, since the upper surface cover member 34 is configured using the net 34c, the cover member 34 can be prevented from being lifted by the wind.

  In the present embodiment, since the side cover member 35 that may be interposed between the cab 9 and the crushing tool 19 is configured using the net 35c, the side cover member 35 is located on the side of the crushing tool 19. Even if it is located in, the operator of the dismantling machine 1 can visually check the crushing tool 19, and the side cover material 35 does not obstruct the visual inspection of the crushing part. Further, the degree to which the side cover member 35 is blown by the wind can be reduced.

  In addition, this invention is applicable also when using the breaker which crushes a demolition target object with a vibration instead of the crushing tool 19. FIG. Further, when the present invention is implemented, a motor or winch can be used as a means for rotating the scattering prevention device main body 32 in addition to the hydraulic cylinder. Also, structures other than the above-described embodiment, such as folding the cover frame 33 in the left-right width or changing the structure in the structure, or changing the width in the front-rear direction to be extendable, can be employed. Further, the structure of the front 10 is not limited to the above-described embodiment, and for example, a part that can be expanded and contracted or an additional part can be provided. In addition, when implementing this invention, not only the said embodiment but a various change and addition are possible in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Dismantling machine 2 Floor surface 3 Anti-scattering sheet 5 Crawler type lower traveling body 7 Turning frame 10 Working front 13 Boom 15 Arm 19 Crushing tool 25 Anti-scattering device 26 Mounting frame 32 Anti-scattering device main body 33 Cover frame 34 Upper surface cover material 34c Net 35 Side cover material 35c Net 36 Side cover material 37 Front cover material 38 Main frame 39 Pivoting shaft 41 Hydraulic cylinder (drive device)
50 Horizontal frame 51 Side frame 55 Extended side frame 60 Extended main frame 73 Reinforcing frame

Claims (5)

A mounting frame provided on the arm at the tip of the work front of the demolition machine,
A cover frame that is pivotably mounted in the front-rear direction by a drive device around a pivot shaft provided in the mounting frame;
A scattering prevention device, comprising: a cover member that is attached to the cover frame and covers the crushing tool attached to the arm from above in a posture in which the cover frame is rotated forward. In the scattering prevention apparatus of Claim 1,
The said cover frame which attaches the said cover material has the structure which the left-right width | variety can change, The scattering prevention apparatus characterized by the above-mentioned. In the scattering prevention device according to claim 1 or 2,
The said cover frame which attaches the said cover material has the structure which can change the front-back width | variety, The scattering prevention apparatus characterized by the above-mentioned. In the scattering prevention device according to any one of claims 1 to 3,
The cover frame is rectangular,
As the cover material, comprising an upper surface cover material provided on the upper surface of the cover frame, a side cover material provided on the side surface of the cover frame, and a front cover material provided on the front surface of the cover frame,
An anti-scattering device, wherein the upper surface cover material is configured using a net. In the scattering prevention device according to any one of claims 1 to 4,
The cover frame is rectangular,
As the cover material, comprising an upper surface cover material provided on the upper surface of the cover frame, a side cover material provided on the side surface of the cover frame, and a front cover material provided on the front surface of the cover frame,
Of the side cover materials, a scattering prevention device comprising a side cover material that may be interposed between at least a cab and the crushing tool, using a net.

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