JP4699343B2 - Fall prevention device for work machines - Google Patents

Description

  The present invention relates to a fall prevention device for a work machine, and more particularly to a fall prevention device for a work machine that can be used on a place having a slope that is a valley and used on a flat ground.

  Conventionally, many devices for preventing overturning of work machines have been known (see, for example, Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4).

  Patent Document 1 discloses that an outrigger provided with a grounding portion at a tip portion on left and right crawler frames of a traveling body, a storage position stored within the width of the crawler, and an outer lateral direction projecting from the side surface of the traveling body, and A crawler-type work machine overturn prevention device is shown that can be switched to a use position in which a grounding portion is in surface contact with a grounding surface on which a traveling body is arranged. This overturn prevention device is based on the assumption that the outrigger extends over a flat ground, and the pontoon (grounding portion) of the outrigger is installed on a substantially horizontal grounding surface on which the traveling body is arranged.

  In Patent Document 2 and Patent Document 3, an outrigger in which a grounding portion is provided at the tip of the frame of the traveling body is stored in the storage position within the width of the frame of the traveling body, and laterally outward from the side surface of the traveling body. Further, there is shown a fall-preventing device for a wheel-type work machine that can be switched to a use position in which a grounding portion is arranged in contact with a surface on a grounding surface that projects over the surface. This overturn prevention device is also based on the premise that the outriggers overhang on a flat ground, and the pontoons of the outriggers are installed on a substantially horizontal ground plane on which the traveling body is arranged.

Patent Document 4 discloses a fall prevention device for a work machine in which an outrigger is provided on a blade of a hydraulic excavator. This fall prevention device is also premised on the installation of an outrigger on a flat ground.
Japanese Utility Model Publication No. 7-35559. Japanese Patent Application Laid-Open No. 7-10473. Japanese Patent Publication No. 63-64339. JP 2006-103627 A.

  However, work machines used in forestry and the like are often used on narrow mountain roads where one is a mountain and the other is a valley. In the work at such a place, as shown in Patent Documents 1 to 4, it is not possible to use a fall prevention device that projects and installs the outriggers. For this reason, the method of preventing falls by carefully proceeding without using a fall prevention device has been adopted, but there is always the danger of falling and there is a problem that workability is poor .

  Therefore, a technology to be solved to prevent the work machine from falling over and to be able to use the work machine safely even in a place where at least one of the ground contact surfaces of the traveling body has a slope descending from the ground contact surface. The present invention aims to solve this problem.

The present invention has been proposed to achieve the above object, and the invention according to claim 1 comprises a center frame and a pair of side frames provided in parallel on both sides of the center frame during operation. In the overturn prevention device for a work machine that protrudes laterally outward from the side surface of the traveling body having a lower frame and temporarily extends the stance of the traveling body,
A telescopic hydraulic cylinder having one end attached to a lug fixed to a turning wheel attaching part on the center frame of the traveling body via a first shaft so as to be rotatable in the vertical direction;
A link mechanism that is separated from the hydraulic cylinder at an upper or lower position, and is attached to the side frame of the traveling body via a second shaft so as to be vertically rotatable.
A grounding portion is provided on one end side, and the other end side is provided with one end of the link mechanism and an outrigger connected to be rotatable in the vertical direction,
A part of the link mechanism is connected to a piston rod inserted into the other end of the hydraulic cylinder, and the outrigger is moved to the side of the traveling body within the width of the traveling body based on the expansion / contraction operation of the hydraulic cylinder. Use in which the storage position is stored and projects from the side surface of the traveling body laterally outward, and the grounding portion comes into contact with the grounding surface on which the traveling body is disposed or the slope that descends from the grounding surface. Provided is a fall prevention device for a work machine that can be disposed at a position.

  According to this configuration, when the work machine is moved, the grounding portion can be stored in the side surface of the traveling body within the width of the traveling body so as not to obstruct the movement. On the other hand, when the hydraulic cylinder is extended, when the hydraulic cylinder is extended, the outrigger protrudes from the side surface of the traveling body to the left and right lateral sides in conjunction with the extension movement of the hydraulic cylinder and the movement of the link mechanism, and the grounding portion is in contact with the hydraulic cylinder. The work machine is supported against a ground or a slope descending from the ground contact surface, and the stance is temporarily expanded to prevent the work machine from falling down.

  Further, by changing the extension amount of the hydraulic cylinder, the inclination of the ground contact portion can be adjusted in accordance with the angle of the slope. Furthermore, by adjusting the length of the ground contact portion extending from the traveling body and bringing the ground contact portion into contact with a horizontal flat ground, it can be used even on a flat ground.

  According to a second aspect of the present invention, there is provided the work machine overturn prevention device according to the first aspect, wherein the traveling body is a crawler type traveling body, and the storage position of the outrigger is provided inside the track shoe.

  According to this structure, the fall prevention device applied to the crawler type work machine is obtained.

  According to a third aspect of the present invention, there is provided the work machine overturn prevention device according to the first or second aspect, wherein the link mechanism is provided with a detachable link lock piece for restraining the movement of the link mechanism.

  According to this configuration, when the outrigger is disposed near the use position and then the link lock piece is attached, the movement of the link mechanism is restrained and the attitude of the outrigger can be maintained at the same time. On the other hand, when the work is completed and the outrigger is stored, the link mechanism can be freely moved by removing the link lock piece, and the outrigger can be moved to the storage position while moving the link mechanism together with the piston rod.

  According to the first aspect of the present invention, when the work machine is moved, the grounding portion is stored in the side surface of the traveling body within the width of the traveling body. Will not affect. On the other hand, when the hydraulic cylinder is extended, when the hydraulic cylinder is extended, the outrigger extends outward from the side surface of the traveling body in conjunction with the extension of the hydraulic cylinder, and the grounding unit is brought into contact with the slope to Supports and temporarily expands the stance to prevent the work machine from falling to the slope side, so it is highly safe for work in a place where one side has a slope that becomes a valley, and the workability is also improved. A good working machine is obtained.

  In addition, by changing the length of the hydraulic cylinder, the inclination of the grounding part can be adjusted according to the angle of the slope, and the grounding part can be used on a flat ground by abutting against a horizontal flat ground. The range of use is expanded.

  Since the invention described in claim 2 can be applied to a crawler type work machine, in addition to the effect of the invention of claim 1, a crawler type work machine having good safety and workability can be obtained.

  According to the third aspect of the present invention, when the link lock piece is attached at the time of work, the movement of the link mechanism is restrained, and at the same time, the posture of the outrigger can be maintained, so that the safety is improved. On the other hand, when the work is finished and the outrigger is stored, the link lock piece can be removed to move the outrigger to the storage position in conjunction with the contraction operation of the hydraulic cylinder. In addition to the effects of the present invention, safety and workability can be further improved.

  In order to achieve the purpose of preventing the work machine from falling down and allowing the work machine to be used safely, even in a place having a slope descending from the ground contact surface on at least one of the ground contact surfaces of the traveling body, In an overturn prevention device for a work machine that protrudes laterally outward from a side surface of a traveling body during work and temporarily expands the stance of the traveling body, one end of the traveling body pivots vertically through a first shaft. A telescopic hydraulic cylinder that is detachably attached, and a link mechanism that is separated from the hydraulic cylinder at an upper or lower position and is pivotally attached to the traveling body via a second shaft. In addition, a grounding portion is provided on one end side, and the other end side is provided with one end of the link mechanism and an outrigger connected to be rotatable in the vertical direction, and connects a part of the link mechanism and the other end portion of the hydraulic cylinder. Shi The outrigger is retracted from the side surface of the traveling body within the width of the traveling body based on the expansion / contraction operation of the hydraulic cylinder, projects outward from the side surface of the traveling body, and extends to the ground. Can be placed on the grounding surface on which the traveling body is disposed or the use position where the traveling body is brought into contact with the inclined surface descending from the grounding surface.

  FIG. 1 shows an example of a hydraulic excavator that is a typical example of a work machine to which the present invention is applied. A hydraulic excavator 10 shown in FIG. 1 includes a lower traveling body 11 capable of self-propelling and an upper revolving body 12 that is rotatably installed on the lower traveling body 11.

  The lower traveling body 11 includes a center frame 13 and a lower frame 15 including a pair of side frames 14 and 14 provided on both sides of the center frame 13 so as to be parallel to each other. An idler wheel 16 is supported on one end side of each side frame 14, 14 so as to be movable back and forth, and a drive wheel 18 that is rotationally driven by a traveling hydraulic motor 17 is provided on the other end side.

  An endless track shoe 19 is provided between the idler wheel 16 and the drive wheel 18, and a plurality of track rollers 20, 20... Are rotatably supported on the upper and lower portions of the side frames 14, 14. The track shoe 19 is driven by the drive wheels 18 and the traveling of the track shoe 19 is guided by the track rollers 20, 20,.

  The upper swing body 12 that is pivotably installed on the center frame 13 of the lower frame 15 is configured with a pivot frame 12a at the bottom, and a work machine 21 is mounted at the front center of the pivot frame 12a.

  The work machine 21 has a base end pivotally attached to the revolving frame 12 a, a boom 23 that can be raised and lowered by a boom cylinder 22, and a base end side pivotally attached to the tip of the boom 23, and an arm 25 that can be rotated by an arm cylinder 24. And a wood grapple 27 pivotally attached to the tip of the arm 25 and rotatable by a bucket cylinder 26.

  A cab 28 is installed at the front of the revolving frame 12a on the left side of the work implement 21 and in the vicinity of the work implement 21, and an engine room covered with a bonnet cover 29 at the rear of the revolving frame 12a. 30 is installed. A power engine (not shown) is accommodated in the engine chamber 30, and a counterweight 31 is attached to the rear end of the turning frame 12a.

  On the other hand, a fall prevention device 32 is attached to one side of the lower frame 15. In the present embodiment, the fall prevention device 32 is provided only on one side of the lower frame 15, but may be provided symmetrically on both the left and right sides.

  As shown in FIGS. 2 to 9, the overturn prevention device 32 includes a pair of front and rear hydraulic cylinders 33, 33, a link mechanism 34, an outrigger 35, and the like.

  The hydraulic cylinder 33 is a cylinder having a piston rod 33 a that can advance and retreat, and is disposed between the upper surface of the center frame 13 and the side frame 14 that constitute the lower frame 15 and the shoe 19. Further, one end portion 33b of the hydraulic cylinder 33 is pivotally attached to a lug 37 fixed to the swivel wheel mounting portion 36 on the center frame 13 through a pivot 38 which is a first shaft so as to be vertically rotatable. . On the other hand, the other end 33 c of the hydraulic cylinder 33 is connected to the link mechanism 34.

  The link mechanism 34 includes a pair of front and rear first link pieces 39, 39, second link pieces 40, 40 arranged on the front and rear sides of the first link pieces 39, 39, a link lock piece 41, A pivot 43 that is a second axis, a pivot 44 that is a third axis, a pivot 45 that is a fourth axis, a collar 46, and the like.

  Each of the first link pieces 39 is attached to a lug 42 whose one end is fixed to the lower portion of the outer surface of the side frame 14 so as to be rotatable in the vertical direction via a pivot 43, and the other end is disposed via a pivot 45. The other end 33c of the hydraulic cylinder 33 is connected to be rotatable in the vertical direction.

  Each of the second link pieces 40 is connected to the other end part 33c of the hydraulic cylinder 33 and the other end part side of the first link piece 39 via the pivot 45 so as to be rotatable in the vertical direction, and the other end part side is connected to the second link piece 40. It is connected to the outrigger 35 through the pivot 44 so as to be rotatable in the vertical direction.

  As shown in FIG. 10, the link lock piece 41 has a hook portion 41a that can be detachably engaged with the pivot 43 on one end side, and can be detachably engaged with the pivot 44 on the other end side. It has a hook part 41b. 4 to 9, the link lock piece 41 is dropped from above the pivot 43 and the pivot 44, and the hook portions 41a and 41b of the link lock piece 41 are engaged with the pivots 43 and 44, respectively. Then, the movement between the first link pieces 39 and 39 and the second link pieces 40 and 40 that can be folded up to that time is restricted, the opening angle is restricted, and the shape of the link mechanism 34 is maintained. .

  The outrigger 35 includes a plate-like pontoon 35a which is a grounding portion and a pair of front and rear lugs 35b and 35b fixedly attached to the upper surface of the pontoon 35a. The pair of lugs 35b and 35b are connected to the link mechanism 34 via the pivot 44 so as to be rotatable in the vertical direction.

  Next, operation | movement of the fall prevention apparatus 32 is demonstrated. When the fall prevention device 32 is not used, the link lock piece 41 is removed from the link mechanism 34. As shown in FIG. 2, the hydraulic cylinder 33 is contracted by retracting the piston rod 33a into the cylinder. Further, the link mechanism 34 is also folded by contracting the hydraulic cylinder 33, and the outrigger 35 raises the pontoon 35a vertically and is disposed at the retracted position in the track shoe (crawler) 19 which is the side surface of the lower traveling body 11. ing. As a result, the outrigger 35 is stored within the width of the excavator 10 so as not to obstruct the movement when the excavator 10 is moved.

  When the overturn prevention device 32 is used, if the piston rod protrudes from the cylinder, the hydraulic cylinder 33 is extended, and the first link piece 39 is rotated around the pivot 43, it will eventually fall as shown in FIG. The entire prevention device 32 projects outwardly in the lateral direction of the track shoe 19, and the pontoon 35 a as a grounding portion is grounded on a slope 48 that descends from the flat ground 47 on which the excavator 10 is placed.

  Further, immediately before the pontoon 35a is grounded, that is, with the second link piece 40 and the outrigger 35 suspended, the lower part of the second link piece 40 or the pontoon 35a is drawn toward the side frame 14 and stored as shown in FIG. When the link lock piece 41 that is sometimes removed is engaged between the pivot 43 and the pivot 44, the triangular shape of the link mechanism 34 is constrained, and at the same time, the posture of the outrigger 35 with respect to the link mechanism 34 is maintained. Thereafter, when the hydraulic cylinder 33 is further extended, only the posture around the pivot 44 is adjusted, and the inclination of the pontoon 35a is adjusted according to the angle of the inclined surface 48, and the pontoon 35 is pressed in parallel to the inclined surface 48. Final ground.

  As a result, the outrigger 35 supports the excavator 10 and prevents the excavator 10 from falling to the slope 48 side. Therefore, it is possible to work safely and efficiently in a place where one side has a slope 48 that becomes a valley.

  When the fall prevention device 32 is used while being grounded on the flat ground 47, adjusting the amount by which the hydraulic cylinder 33 is extended changes the position of the pontoon 35 in the height direction from the lower frame 15, and the pontoon 35 is moved to the flat ground. 47 can be grounded.

  Furthermore, when returning the fall prevention device 32 from the overhanging state (use position) shown in FIG. 4 to the storage position again, the link lock piece 41 is removed and the hydraulic cylinder 33 is contracted. When the hydraulic cylinder 33 is contracted, the first link piece 39 rotates about the pivot 43 in the clockwise direction of FIG. 3, and the second link piece 40 and the outrigger 35 are suspended while the side frame 14 side. Be drawn to. In the final storage position, as shown in FIG. 2, the link mechanism 34 is folded and the outrigger 35 is stored in the track shoe (crawler) 19 with the pontoon 35a standing vertically. The length of the second link piece 40 here is shorter than that of the first link piece 39 so as not to interfere with the lug 42 fixed to the side frame 14 in the retracted state of FIG.

  In the present embodiment, the work machine in which the wood grapple 27 is mounted instead of the excavation bucket in the crawler excavator 10 has been described. However, the work machine includes a hydraulic excavator, a bulldozer, a crane, a forklift, and the like. There are work vehicles and transport vehicles such as trucks used at construction sites. Therefore, the present invention is not limited to hydraulic excavators, and is applicable to those work machines. Furthermore, the fall prevention device of the present invention can be provided in combination with a conventional fall prevention device used on a flat ground.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The side view of the hydraulic excavator carrying the fall prevention device by this invention. The front view which fractures | ruptures and shows a part of lower traveling body which stored the fall prevention apparatus same as the above. The front view which fractures | ruptures and shows a part of lower traveling body in the middle of extending the fall prevention apparatus same as the above. The front view which fractures | ruptures and shows a part of lower traveling body which overhanged the fall prevention apparatus same as the above. The top view of a fall prevention apparatus same as the above shown in an overhanging state. The front view of a fall prevention apparatus same as the above shown in an overhanging state. FIG. 6 is a cross-sectional view taken along arrow A in FIG. 5. B arrow sectional drawing of FIG. C arrow sectional drawing of FIG. The side view of the link lock piece in a fall prevention device same as the above.

Explanation of symbols

10 Hydraulic excavator (work machine)
DESCRIPTION OF SYMBOLS 11 Lower traveling body 14 Side frame 32 Fall prevention device 33 Hydraulic cylinder 33a Piston rod 34 Link mechanism 35 Outrigger 35a Pontoon (grounding part)
35b Lug 36 Swivel wheel mounting part 37 Lug 38 Pivot (first axis)
39 first link piece 40 second link piece 41 link lock piece 43 pivot (second axis)
44 Axis (third axis)
45 Axis (fourth axis)
47 Flat ground 48 Slope

Claims (3)

During work , the stance of the traveling body is temporarily extended by projecting laterally outward from the side surface of the traveling body having a center frame and a lower frame comprising a pair of side frames provided parallel to both sides of the center frame. In the fall prevention device for work machines,
A telescopic hydraulic cylinder having one end attached to a lug fixed to a turning wheel attaching part on the center frame of the traveling body via a first shaft so as to be rotatable in the vertical direction;
A link mechanism that is separated from the hydraulic cylinder at an upper or lower position, and is attached to the side frame of the traveling body via a second shaft so as to be vertically rotatable.
A grounding portion is provided on one end side, and the other end side is provided with one end of the link mechanism and an outrigger connected to be rotatable in the vertical direction,
A part of the link mechanism is connected to a piston rod inserted into the other end of the hydraulic cylinder, and the outrigger is moved to the side of the traveling body within the width of the traveling body based on the expansion / contraction operation of the hydraulic cylinder. Use in which the storage position is stored and projects from the side surface of the traveling body laterally outward, and the grounding portion comes into contact with the grounding surface on which the traveling body is disposed or the slope that descends from the grounding surface. A fall prevention device for a work machine, characterized in that it can be placed at a position.   2. The overturn prevention device for a work machine according to claim 1, wherein the traveling body is a crawler traveling body, and the storage position of the outrigger is provided inside the track shoe.   The fall prevention device for a work machine according to claim 1 or 2, wherein the link mechanism is provided with a detachable link lock piece for restraining movement of the link mechanism.

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