JP5145064B2 - Boom structure - Google Patents

Description

  The present invention relates to a boom structure of a boom attached to a vehicle body or the like of a work vehicle, and more particularly to a boom boom structure in which a line-shaped member that performs oil supply or power transmission is disposed from the vehicle body or the like to the tip of the boom. .

The boom structure as described above is generally provided in a work vehicle on which a work device is mounted. The working device is configured to include a swivel base that is swingably movable on the vehicle body, a boom that is pivotably pivoted to the swivel base, and a work base that is provided at the tip of the boom. There is something. The boom of this working device is configured such that a plurality of boom members are nested, and the entire boom can be expanded and contracted by an expansion cylinder, and can be moved up and down by a lifting cylinder (hydraulic cylinder). The part is pivotally connected to a cylinder bracket provided on the lower surface of the boom, and the bottom side end of the hoisting cylinder is pivotally connected to a swivel. The boom is provided with a line-shaped member including an oil feeding hose that supplies pressure oil to an actuator disposed on the distal end side of the boom, a signal transmission line that connects between the proximal end side and the distal end side of the boom, and the like. (For example, refer to Patent Document 1).
JP-A-8-108997

  In general, a line member such as an oil feeding hose or a signal transmission line disposed on a boom passes through the inside of a plurality of boom members, and the most proximal boom member (hereinafter referred to as a base member) among the plurality of boom members. (Referred to as an end boom member) is drawn to the outside from an extraction hole of a line-shaped member formed on the lower surface of the base boom member, and extends to the base end portion on the lower surface of the base boom member along the boom extending direction. At this time, the cylinder bracket is mainly provided on the lower surface of the proximal boom member on the most proximal side among the plurality of boom members, and the line-shaped member is drawn around the lower surface side of the proximal boom member as described above. In such a case, the cylinder bracket may interfere with the routing work and may reduce workability. On the other hand, in the cylinder bracket, various measures are taken to improve the workability of the routing of the line-shaped member by providing an opening through which the line-shaped member can be inserted in the mounting portion between the cylinder bracket and the lower surface of the base end boom member. However, in this case, there is a risk that the mounting strength of the cylinder bracket to the base end boom member may be reduced. Therefore, it is necessary to prevent the strength from being lowered by providing a reinforcing member on the cylinder bracket. There arises a problem that the cost increases and the weight of the cylinder bracket increases.

  The present invention has been made in view of the above problems, and has a relatively simple structure that prevents a decrease in strength and facilitates the work of disposing a line-shaped member on the lower surface of the boom. An object is to provide a boom structure.

  In order to solve the above-described problem, a boom structure according to the present invention includes a base (for example, the traveling body 10 in the embodiment) and a hollow having an internal space that is provided at least in a vertically movable manner on the base and extends in the longitudinal direction. A long boom (for example, the telescopic boom 30 in the embodiment), a cylinder bracket provided on the lower surface of the boom, and one end portion pivotally connected to the cylinder bracket for raising and lowering the boom, and the other end portion serving as a base A boom structure having a pivoted undulation cylinder, wherein the boom is formed in a lower surface of the boom and communicates with the internal space, and a line extending in the internal space and routed from the extraction hole The drawer hole is located near the cylinder bracket mounting position and between one end and the other end of the cylinder bracket in the boom longitudinal direction. It is.

  In the boom structure configured as described above, the cylinder bracket is disposed so as to face the lower surface of the boom with a predetermined interval in the boom width direction, and a pair of side plate portions whose upper ends are fixed to the lower surface of the boom and extend downward. And a box member having a bottomed container shape having a lower plate portion connecting the lower end portions of the pair of side plate portions, and a flat plate shape that is fixed to the side surface of the box member on the boom base end side and extends in the boom width direction. A vertical plate member, a flat boss member that is fixed to the side surface of the boom base end side of the vertical plate member and the lower surface of the boom and extends vertically and pivotally connects one end portion of the hoisting cylinder (for example, the boss plate 74 in the embodiment) In the standing plate member, an insertion hole (for example, the cutout portion 73c in the embodiment) through which the line-shaped member can be inserted in the boom longitudinal direction corresponds to the drawing position in the boom width direction. To be formed It is preferred.

  The cylinder bracket includes a flat-plate-like tip member that is fixed to the boom tip side of the box member and extends in the boom width direction, and has a drawer hole between the tip member and the standing plate member and the boom width of the side plate portion. It is preferable to be arranged outside the direction.

  Furthermore, it is preferable that a drawer hole is formed between the upper ends of the pair of side plate parts, and a box member is provided on the lower surface of the boom so as to cover the drawer hole from below.

  Further, the lower surface of the boom has a pair of inclined surface portions that inwardly incline from both ends in the boom width direction and extends downward, and a bottom surface portion that connects between the lower end portions of the pair of inclined surface portions, and the drawer hole has a pair Preferably, the line-shaped member is disposed along the inclined surface portion from the lead-out hole.

  According to the boom structure according to the present invention, it is possible to easily perform the line-shaped member disposing operation for drawing the line-shaped member to the outside from the pull-out hole on the lower surface of the boom and drawing it to the base end portion of the boom. In particular, the relatively simple structure can facilitate the installation work of the line-shaped member without lowering the mounting strength on the lower surface of the boom. An increase in weight can be prevented.

  Further, by forming inclined surface portions that are inclined inwardly from both ends in the boom width direction and extend downward on the lower surface of the boom, the line-shaped member is disposed along the inclined surface portion, and thus the outer side of the line-shaped member is arranged. It is possible to prevent the safety of the work from deteriorating, such as being caught by an obstacle during work because the protrusion to

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, the configuration of an aerial work vehicle to which the boom structure according to the present invention is applied will be described with reference to FIG. The aerial work vehicle 1 includes tire wheels 11, 11,..., A truck-type traveling body 10 that can be traveled from a driving cab 12, a swivel base 20 provided on the traveling body 10, and the turning A telescopic boom 30 attached to the upper part of a support column 21 extending upward from the base 20 by a foot pin 22 so as to be swingable up and down, and a work platform 60 for boarding an operator attached to the tip of the telescopic boom 30. And is configured.

  The swivel base 20 is attached to the upper part of the traveling body 10 so as to be rotatable 360 degrees around a vertical axis. A turning motor (hydraulic motor) 23 is provided inside the traveling body 10, and by rotating the turning motor 23, the turntable 20 can be horizontally turned through a gear (not shown).

  The telescopic boom 30 includes a base end boom member 31 pivotally supported on the swivel base 20, an intermediate boom member 32 inserted into the base end boom member 31 so as to extend and contract in the longitudinal direction, and the intermediate boom. Telescopic (nested) is combined with the tip boom member 33 inserted into the member 32 so as to be movable in the longitudinal direction, and the built-in telescopic cylinder (hydraulic cylinder) 37 is telescopically operated to extend the entire telescopic boom 30 in the longitudinal direction. Can be expanded and contracted in the direction. Further, the telescopic boom 30 is pivotally connected to the cylinder bracket 70 fixed to the lower surface of the proximal boom member 31 located on the most proximal side, and the bottom end is pivotally connected to the swivel base 20. Further, by operating the hoisting cylinder (hydraulic cylinder) 24 to extend and retract, the entire telescopic boom 30 can be raised and lowered within the upper and lower surfaces.

  The base end boom member 31 has a rectangular shape in a longitudinal sectional view, and as shown in FIG. 3, a pair of inclined surface portions that incline inward and extend downward at both ends of the bottom surface of the boom width direction (left and right direction). 31a is formed, and a bottom surface portion 31b is connected between the lower end portions of the pair of inclined surface portions 31a. A ridge portion connecting the inclined surface portion 31a and the bottom surface portion 31b is formed with a rectangular lead-out hole 34 penetrating the inclined surface portion 31a and the bottom surface portion 31b in a substantially vertical direction. Further, a plurality of boss portions having screw holes 31d that can be screwed with bolts 79 for screwing a second cover member 76 (see FIG. 4), which will be described later, protrude from the bottom surface portion 31b.

  A boom head 38 is attached to the distal end portion of the distal end boom member 33, and a lower end portion of a vertical post 52 is attached to the boom head 38 via a swing pin 51. The vertical post 52 is configured so that the vertical posture is always maintained by a leveling device (not shown) provided in the telescopic boom 30 regardless of the undulation angle of the telescopic boom 30.

  The work table 60 has a box shape, and is rotatably attached to the upper end portion of the vertical post 52 via a work table holding bracket 61 that protrudes to the outside. A swing motor (hydraulic motor) 62 is provided inside the worktable holding bracket 61. By swinging the swing motor 62, the worktable 60 is swung around the vertical post 52 (horizontal). Swivel motion). Here, since the vertical post 52 is always maintained in the vertical posture as described above, as a result, the floor surface of the work table 60 is always held horizontally regardless of the undulation angle of the telescopic boom 30.

  Outrigger jacks 13, 13,... Are provided at the front, rear, left, and right portions of the traveling body 10 to support the traveling body 10 in a stable state. Each outrigger jack 13 includes an outer jack (cylinder tube) 13a that extends in the vertical direction, an inner jack (piston rod) 13b that is provided in the outer jack 13a and can be expanded and contracted in the vertical direction, and a lower end portion of the inner jack 13b. Each of the outrigger jacks 13 is moved (elongated), and the jack pad 13c is grounded to the ground and stretched. The body 10 can be supported in a lifted state. In addition, each outrigger jack 13 can be extended to the side of the traveling body 10 so that higher stability of the traveling body 10 can be obtained.

  On the work table 60, there is provided an operation device 63 for performing a moving operation of the work table 60, that is, a turning operation of the swivel table 20, raising and lowering of the telescopic boom 30, a telescopic operation, and a swinging operation of the work table 60. The operator who has boarded the work table 60 operates the operation device 63 to rotate the swing motor 23, extend and retract the hoisting cylinder 24, extend and retract the expansion cylinder 37, and rotate the swing motor 62. An operation can be performed to move the workbench 60 to a desired position.

  In the aerial work vehicle 1 configured as described above, as shown in FIG. 3, an oil feeding hose that supplies hydraulic oil from a hydraulic pump (not shown) built in the traveling body 10 to the swing motor 62 and the like. Further, the telescopic boom 30 is provided with a line-shaped member 40 including a signal transmission line or the like that connects between the operation device 63 provided on the work table 60 and a controller (not shown) provided on the traveling body 10. ing. The line-shaped member 40 is supported inside the telescopic boom 30 by a belt-shaped protective guide member (not shown) so as to be smoothly guided according to the expansion and contraction movement of the telescopic boom 30, and the bottom surface of the proximal boom member 31. It is pulled out to the outside of the telescopic boom 30 through the pull-out hole 34 formed in the portion 31 b and supported so as to extend along the longitudinal direction of the inclined surface portion 31 a via the cylinder bracket 70. Now, two examples of the configuration of the boom structure according to the present invention will be described.

  First, a first embodiment of a boom structure according to the present invention will be described with reference to FIGS. 1 and 3 to 4. As shown in FIG. 4, the boom structure according to the first embodiment includes a telescopic boom 30, a line member 40, a hoisting cylinder 24, a cylinder bracket 70, a first cover member 75, and a second cover member 76. Is done. The configuration of the telescopic boom 30, the line-shaped member 40 and the hoisting cylinder 24 has already been described in detail as described above, and therefore will not be repeated. The configuration of the cylinder bracket 70 and the cover members 75 and 76 will be mainly described. Explained.

  The cylinder bracket 70 is a box that covers a substantially box-shaped box member 71 that is fixed to the bottom surface portion 31b of the proximal boom member 31 and extends in the boom extending direction, and an opening that opens in the boom extending direction of the box member 71. The member 71 includes a tip member 72 and a standing plate member 73 fixed to respective ends of the boom extending direction of the member 71, and a pair of boss plates 74 fixed to the standing plate member 73.

  The box member 71 has a pair of drawer holes 34 (only the left drawer hole 34 is shown in FIG. 1) formed on the lower surface of the proximal boom member 31 on the left and right sides, respectively. 31 is fixed to the bottom surface portion 31b. The box member 71 is formed to have a pair of side plate portions 71a opposed to each other with a predetermined interval in the boom width direction and a lower plate portion 71b connecting the lower ends of the pair of side plate portions 71a. . A screw hole 71c for attaching the first cover member 75 by a bolt 79 (see FIG. 4) is formed in the lower plate portion 71b. In this embodiment, the box member 71 is formed by welding the pair of side plate portions 71a and the lower plate portion 71b. However, the box member 71 may be formed integrally by bending a sheet metal.

  At both ends of the box member 71 in the boom extending direction (front-rear direction), a tip member 72 and a standing plate member 73 are fixed by welding so as to sandwich the box member 71 from the front and rear and cover the opening in the boom extending direction. Is provided.

  The distal end member 72 is formed in a plate shape extending in the vertical direction, and is fixed to the front end portion of the box member 71 as described above, and the upper end is fixed across the lower surface and the left and right side surfaces of the proximal boom member 31. .

  The standing plate member 73 is fixed to the rear end portion of the box member 71 and has a main body portion 73a formed in a plate shape in which the upper end is fixed over the lower surface and the left and right side surfaces of the proximal boom member 31 and extends in the vertical direction; It is formed to have a joint portion 73b that is fixed to the bottom surface portion 31b of the base end boom member 31 and is bent from the center upper portion of the main body portion 73a and extends to the boom base end side. The main body 73a is formed with a notch 73c through which the line-shaped member 40 can be inserted in the boom extending direction.

  The boss plates 74 are formed in a rectangular shape when viewed from the side, and are arranged to face each other with a predetermined interval in the boom width direction. The pair of left and right boss plates 74 has a front end portion fixed to the main body portion 73a of the standing plate member 73 and an upper end portion fixed to the joint portion 73b. In addition, a through hole 74 a that penetrates in the boom width direction is formed at the center of the boss plate 74. Then, the rod side end portion of the hoisting cylinder 24 is inserted between the pair of boss plates 74, and the pin 29 is inserted in a state where a hole portion (not shown) formed in the rod side end portion communicates with the pin hole 74a. The rod side end is attached so as to be swingable up and down.

  As shown in FIG. 4, the first cover member 75 is formed in a substantially box shape. The first cover member 75 is fitted between the tip member 72 and the standing plate member 73 and covers the lead-out hole 34 from below, and is boxed by a bolt 78. The member 71 is detachably attached.

  The second cover member 76 is detachably attached by a bolt 79 so as to cover the space from the standing plate member 73 to the proximal end portion of the proximal boom member 31 on the lower surface (inclined surface portion 31a) of the proximal boom member 31. . Thereby, all the parts exposed to the lower surface side of the base end boom member 31 in the line-shaped member 40 can be covered with the first and second cover members 75 and 76, and the outside of the line-shaped member 40 can be covered. Large protrusion to the direction can be prevented.

  Next, in the boom structure configured as described above, a procedure when the line-shaped member 40 is routed around the bottom surface of the proximal boom member 31 will be described. First, as shown in FIG. 1, the tip end portion 40 a (see FIG. 3) of the line-shaped member 40 disposed inside the telescopic boom 30 is pulled out from the telescopic boom 30 to the outside. At this time, since the extraction hole 34 is in an exposed state that is not covered by the cover member 72 or the like, the operator can easily draw the line-shaped member 40 to the outside by placing a hand in the extraction hole 34.

  Then, the drawn line-shaped member 40 is pulled toward the base end side of the base end boom member 31 along the boom extending direction and is inserted into the cutout portion 73 of the cylinder bracket 70, and then the base end boom member 31 is tilted. It moves so that it may extend to the base end part of the base end boom member 31 along the surface part 31a. Then, as shown in FIG. 3, the distal end portion 40 a of the line-shaped member 40 is passed through the lower surface opening portion 31 c formed in the proximal end portion of the proximal end boom member 31 so as to enter the interior thereof. A plurality of line holding members 80 attached to the base boom member 31 and the support column 21 so as to protrude from the side portions of the base end boom member 31 and the support column 21 after being pulled out from an upper surface opening (not shown) formed in the upper surface portion. Hold. Such a routing operation of the line-shaped member 40 is performed by an operator. However, according to this boom structure, the routing operation is not hindered, and the line-shaped member 40 is removed from the pull-out hole 34 of the base end boom member 31. It can be pulled out to the outside and easily routed to the lower surface of the base end boom member 31. Note that, for example, an oil supply hose that supplies pressure oil from a hydraulic pump is connected to the tip of the line-shaped member 40 via a joint, a nipple, or the like (not shown).

  Then, the first cover member 75 is attached to the lower surface of the base end boom member 31 with a bolt 78, and the second cover member 76 is attached with a bolt 79, thereby being pulled out from the lead-out hole 34 as shown in FIG. All of the line-shaped members 40 routed along the lower surface of the proximal boom member 31 can be covered. Moreover, since the line-shaped member 40 is supported along the inclined surface portion 31a on the lower surface of the base end boom member 31, the outward protrusion of the line-shaped member 40 can be reduced as shown in FIG. In particular, by suppressing the line-shaped member 40 from protruding to the side of the base end boom member 31, it is possible to prevent the safety of the work from being lowered, such as being caught by an obstacle during the work.

  As described above, according to the boom structure according to the first embodiment, the line-shaped member 40 can be easily routed along the lower surface of the base end boom member 31 with a relatively simple structure, and Protrusion to can be prevented.

  Next, a second embodiment of the boom structure according to the present invention will be described with reference to FIG. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The boom structure according to the second embodiment has a telescopic boom 30, a line member 40, a hoisting cylinder 24, and a cylinder bracket 70 '. Hereinafter, the second embodiment will be described focusing on the configuration of the cylinder bracket 70 as in the case of the description of the first embodiment.

  As shown in FIG. 6A, the cylinder bracket 70 'is fixed to the lower surface of the base end boom member 31 and extends in the boom extending direction, and opens to the base end side of the box member 71'. The standing plate member 73 ′ fixed so as to cover the opening and the boom base end side surface of the standing plate member 73 ′ are attached to the boom proximal end side surface and extend vertically, and are arranged to face each other with a predetermined interval in the boom width direction. A pair of boss plates 74 ′ and a mounting plate 77 fixed to the inclined surface portion 31 a of the proximal boom member 31 and fixing the left and right ends of the standing plate member 73 ′ to the inclined surface portion 31 a of the proximal boom member 31. Configured.

  The box member 71 ′ is arranged to face each other with a predetermined interval in the boom width direction, and is substantially in plan view connecting a pair of triangular side plate portions 71 a ′ in a side view and the lower surfaces of the pair of side plate portions 71 a ′. A trapezoidal lower plate portion 71b 'is formed. Each of the pair of side plate portions 71b ′ is formed with a rectangular work hole 71d penetrating substantially in the boom width direction.

  The standing plate member 73 ′ has a main body 73 a ′ having a substantially trapezoidal shape (substantially trapezoidal shape similar to the opening of the box member 71 ′) in a plan view covering the opening of the box member 71 ′, and the main body 73 a ′. And a joint portion 73b 'which is bent from the upper part of the arm and extends toward the boom base end side. As shown in FIG. 6B, a pair of through holes 73d penetrating in the boom extending direction are formed in the main body 73a 'on the left and right, and the through holes 73d pass through the line-shaped member 40 in the boom extending direction. Is possible.

  In the boom structure of the second embodiment configured as described above, when the line-shaped member 40 is routed around the bottom surface of the base end boom member 31, first, the line-shaped member 40 disposed inside the telescopic boom 30 is used. After the distal end portion 40a (the line-shaped member 40 is not shown in FIG. 6) is pulled out of the telescopic boom 30 from the extraction hole 34, it is pulled to the proximal end side of the proximal boom member 31 along the boom extending direction. The plate member 73 'is inserted through the insertion hole 73d. At this time, since the work hole 71d is formed in the box member 71 ', the operator puts his hand into the box member 71' through the work hole 71d and easily raises the line-shaped member 40 to the upright plate member 73. ′ Through the through-hole 73d. Then, the linear member 40 is moved along the inclined surface portion 31 a of the proximal boom member 31 so as to extend to the proximal end portion of the proximal boom member 31, thereby moving the linear member 40 of the proximal boom member 31. Can be routed to the bottom surface. Further, since the box member 71 ′ is provided so as to cover the drawing hole 34, the cylinder bracket 70 ′ is included in the line-shaped member 40 without providing the first cover member 75 as in the boom structure of the first embodiment. Exposure can be prevented by covering the portion (the portion covered by the first cover member 75).

  As described above, even with the boom structure according to the second embodiment, the line-shaped member 40 can be easily routed along the lower surface of the proximal boom member 31 with a relatively simple structure. Also in the boom structure of the second embodiment, the second cover member 76 is provided in the same manner as the boom structure of the first embodiment, and the line-shaped member 40 is covered on the lower surface of the proximal boom 31 to thereby form the line-shaped member. It is preferable to further prevent exposure of 40.

  Although the preferred embodiments of the present invention have been described so far, the scope of the present invention is not limited to those shown in the above-described embodiments. For example, in the above-described embodiment, the case where the line-shaped member 40 disposed in the telescopic boom 30 is composed of an oil feeding hose and a signal transmission line has been described as an example, but the present invention is not limited to this. Of course, the line-shaped member can also be used for line-shaped members having other configurations such as an optical fiber cable.

  Moreover, in the said embodiment, although the boom was the direct extension type expansion-contraction boom 30 which expands-contracts in a longitudinal direction, this invention is not limited to this, It is a front-end extension type extension boom, a bending extension boom, etc. There may be.

It is a perspective view which shows the boom structure concerning 1st Example of this invention. It is a side view of an aerial work vehicle provided with a boom structure according to the present invention. It is a perspective view which shows the boom structure which concerns on 1st Example, Comprising: The state before the 1st and 2nd cover member is attached is shown. It is a perspective view which shows the boom structure which concerns on 1st Example, Comprising: The state in which the 1st and 2nd cover member was attached is shown. It is principal part sectional drawing which shows the state by which the 2nd cover member was attached to the base end boom member. The cylinder bracket which comprises a part of boom structure concerning 2nd Example of this invention is shown, (A) is a perspective view of a cylinder bracket, (B) is a bottom face part of a cylinder bracket.

Explanation of symbols

1 aerial work vehicle 10 traveling body (base)
24 Hoisting cylinder 30 Telescopic boom (boom)
31 Base end boom member 31a Inclined surface portion 31b Bottom surface portion 40 Line-shaped members 70, 70 'Cylinder bracket 71, 71' Box member 72 Tip member 73, 73 'Standing plate member 73c Notch (insertion hole)
73d Through hole (insertion hole)
74, 74 'Boss plate (boss member)

Claims (5)

A base, a hollow boom having an inner space extending at least in the longitudinal direction, the cylinder bracket provided on the lower surface of the boom, and the boom being raised and lowered. Therefore, a boom structure having an undulating cylinder having one end pivoted to the cylinder bracket and the other end pivoted to the base,
The boom has a drawing hole formed in a lower surface of the boom and communicating with the internal space, and a line-shaped member extending in the internal space and routed from the drawing hole.
A boom structure characterized in that the drawer hole is provided in the vicinity of an attachment position of the cylinder bracket and between one end and the other end of the cylinder bracket in the boom longitudinal direction. The cylinder bracket is disposed opposite to the lower surface of the boom at a predetermined interval in the boom width direction, and has a pair of side plate portions and an upper end portion fixed to the lower surface of the boom and extending downward. A box member having a bottomed container shape having a lower plate portion connecting the lower end portions, a flat plate-like plate member fixed to the side surface of the box member on the boom base end side and extending in the boom width direction, A flat boss member that is fixed to the side surface of the boom base end side of the upright plate member and the lower surface of the boom and extends vertically, and pivotally connects the one end portion of the hoisting cylinder;
The insertion hole through which the line-shaped member can be inserted in the boom longitudinal direction is formed in the standing plate member with the arrangement position in the boom width direction corresponding to the extraction hole. The boom structure according to 1. The cylinder bracket includes a flat plate-like tip member that is fixed to the boom tip side of the box member and extends in the boom width direction,
The boom structure according to claim 2, wherein the drawer hole is configured to be positioned between the tip member and the standing plate member and outside the side plate portion in the boom width direction. The extraction hole is formed between the upper end portions of the pair of side plate portions,
The boom structure according to claim 2, wherein the box member is provided on a lower surface of the boom so as to cover the drawer hole from below. The bottom surface of the boom has a pair of inclined surface portions that inwardly incline from both ends in the boom width direction and extends downward, and a bottom surface portion that connects between the lower end portions of the pair of inclined surface portions,
The extraction hole is formed in at least one of the pair of inclined surface portions,
The boom structure according to any one of claims 1 to 4, wherein the line-shaped member is disposed along the inclined surface portion from the lead-out hole.

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