JP2006009463A - Cab raising device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cab raising device capable of improving transport efficiency and widening the range of selecting the position of a cab. <P>SOLUTION: A cab raising parallel link 13 is pivoted on a parallel link supporting bracket 12 erected on an upper turning body 4 in a vertically rotatable manner and, at the same time, a cab raising cylinder 21 is interposed between the parallel link 13 and the supporting bracket 12. A cab overhanging parallel link 23 is pivoted on a connection bracket 22 fixed to the front end section of the cab raising parallel link 13 in a longitudinally rotatable manner and, at the same time, a cab overhanging cylinder 31 is interposed between the parallel link 23 and the connection bracket 22. A holder as a horizontal link member 28 is provided to the front end section of the cab overhanging parallel link 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cab raising device, and more particularly to a cab raising device with a bulge function that raises a cab via a parallel link to an upper swing body on a lower traveling body.

  This type of conventional cab lifting device is such that a first parallel link having a pair of front and rear long side link members is rotatable in the front-rear direction on a horizontally long horizontal bracket fixed to an upper turning body such as a port cargo handling work machine. The upper ends of the pair of front and rear link members are pivotally attached to the lower edge of the right triangle bracket. A second parallel link having a pair of upper and lower long side link members is pivotally supported on the vertical side edge of the right triangle bracket so as to be rotatable in the vertical direction, and the front end portions of the pair of upper and lower long side link members are A cab installation base is extended forwardly to a vertical bracket that is pivotally connected to each other (see Patent Document 1).

  Thus, the cab is projected as the first parallel link rotates forward from the rearward tilting posture when retracted toward the forward tilting posture, and the second parallel link is tilted downward when retracted. It rises as it turns upward toward the upward tilting posture.

  When the cab is stored, the second parallel link is stored in a downwardly inclined position between the cab and the first parallel link in the rearwardly inclined position. In this case, the downwardly inclined end portion of the second parallel link is in a state in which the front portion of the airframe is closely directed.

When the cab in the stowed state is extended, when the first parallel link is first rotated forward from the rearward tilting posture toward the forward tilting posture, the second parallel link in the downward tilting posture is rotated forward and downward. There is a risk of interference with the front of the aircraft. Therefore, in order to avoid interference between the two, the cab overhanging operation using the first parallel link and the cab raising operation using the second parallel link need to be performed in an interrelated manner. For example, after raising the cab to a predetermined height with the second parallel link, it is necessary to project the cab forward with the first parallel link.
JP 2001-260952 A

  In the cab raising device described in Patent Document 1, since the second parallel link is stored between the cab and the first parallel link, the distance between the cab and its turning center (the turning radius) ) Becomes longer. Accordingly, since the working machine is also increased in overall length, the transport workability is deteriorated when the work machine is transported by a truck or the like.

  Further, as the turning radius of the cab becomes longer, the interference range in front of the cab becomes longer accordingly, and there is a problem that the range of selectable cab positions is reduced. In particular, when the cab in the storage state is extended, it is necessary to operate the first parallel link and the second parallel link in association with each other, so that the range of the operable cab position is narrowed.

  Therefore, a technical problem that should be solved in order to improve the transport efficiency of the swivel work machine and expand the range of selectable cab positions arises, and the present invention solves the problem. With the goal.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that an upper revolving unit is rotatably mounted on a lower traveling body and a vertically long parallel link is supported on the upper revolving unit. A bracket is erected, and a cab raising parallel link having a pair of upper and lower link members is pivotally attached to the upper end portion of the parallel link support bracket so as to be pivotable in the vertical direction. Are pivotally connected to each other by a vertical link member, and a connection bracket is fixed to the vertical link member substantially horizontally. Further, a parallel link for extending a cab having a pair of front and rear link members is rotated on the connection bracket in the front-rear direction. A pair of front and rear link members are pivotally attached to each other, and a cab is mounted on the gantry / horizontal link member, and a cab is mounted on the gantry / horizontal link member. The parallel link rises as it rotates upward from the downward tilted position to the upward tilted position during storage, and the parallel link for extending the cab rotates forward from the backward tilted position to the forward tilted position during storage. There is provided a cab raising device configured to project along with the cab.

  According to this configuration, when the cab in the stored state is extended, the cab is extended by rotating the cab extension parallel link forward, but in this case, the cab need not be raised to a predetermined height. Since the parallel link for extending the cab moves forward on the connection bracket, it does not interfere with the front part of the airframe.

  Further, the cab-lifting parallel link and the cab-extending parallel link are rotated so as to be inclined downward and backward, respectively, and the cab is stored. In this storage state, the cab-extending parallel link is It is stored at a position directly below the cab, and the turning radius between the cab and the turning center is shortened.

  According to a second aspect of the present invention, the parallel link for raising the cab is driven by a raising cylinder provided between the parallel link for raising the cab and the parallel link support bracket, and the parallel link for extending the cab is The cab raising device according to claim 1, wherein the cab raising device is driven by a protruding cylinder provided between a parallel link for extending the cab and the connection bracket.

  According to this configuration, the cab raising parallel link is driven by the cab raising cylinder, and the cab extension parallel link is driven by the cab extension cylinder.

  According to the first aspect of the present invention, since the turning radius of the cab is shortened when the cab is stored, the overall length of the work implement is shortened, and the transport efficiency of the work implement is improved. Further, the interference area in front of the cab disappears as the turning radius of the cab is shortened, and the range of selectable cab positions is expanded. Furthermore, since there is no possibility that the parallel link for extending the cab interferes with the front part of the aircraft during the extension of the cab, the parallel link for raising the cab and the parallel link for raising the cab can be operated individually without being interrelated.

  According to the second aspect of the present invention, since the cab raising cylinder and the cab overhanging cylinder are disposed on the parallel link support bracket and the connection bracket, respectively, in addition to the effect of the first aspect, The overhanging operation can be operated individually. Further, the cylinder for extending the cab can be stored compactly at a position directly below the cab together with the parallel link for extending the cab on the connection bracket.

In the present invention, an upper swing body is rotatably mounted on a lower traveling body, a vertically long parallel link support bracket is erected on the upper swing body, and a pair of upper and lower link members is provided at an upper end portion of the parallel link support bracket. A parallel link for raising the cab having a pivot is pivotally mounted in the vertical direction, the distal ends of the pair of upper and lower link members are pivotally connected by a vertical link member, and a connection bracket is substantially horizontally attached to the vertical link member. Further, on the connecting bracket, a parallel link for extending a cab having a pair of front and rear link members is pivotally attached to the front and rear direction so that the upper ends of the pair of front and rear link members are horizontally mounted as a gantry. A cab is mounted on the pedestal / horizontal link member while being pivoted by a link member, and the cab rotates upwardly from a downward inclined position to an upward inclined position when the cab raising parallel link is stored. So that the parallel link for extending the cab protrudes from the rearward tilting posture toward the forward tilting posture during storage, thereby shortening the overall length of the machine body. The purpose of improving the transportation efficiency of the vehicle and expanding the range of selectable cab positions was achieved.

  An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes a hydraulic excavator, and the hydraulic excavator 1 has a lower traveling body 2 and an upper revolving body 4 that is rotatably mounted on the lower traveling body 2 via a revolving mechanism 3. . A cab 5 is provided on one front side of the upper swing body 4 so as to be movable up and down and back and forth through parallel links 13 and 23 described later. Further, a boom 6 is attached to the front center portion of the upper swing body 4 so as to be able to be raised and lowered, and a boom cylinder 7 is interposed between the boom 6 and the upper swing body 4.

  An arm 8 is attached to the tip of the boom 6 so as to be rotatable up and down, and an arm cylinder 9 is interposed between the arm 7 and the boom 6. A work tool 10 such as a grapple bucket or a lifting magnet is rotatably attached to the tip of the arm 8, and a bucket cylinder 11 is interposed between the work tool 10 and the arm 8. Yes.

  Next, the cab lifting device will be described in detail. A vertically long parallel link support bracket 12 is erected on the front portion of the upper swing body 4, and an upper portion of the parallel link support bracket 12 is formed to be inclined rearward so as to warp the upper swing body 4 side. Yes. Further, the upper end portion of the parallel link support bracket 12 extends to a position above the upper swing body 4.

  A cab raising parallel link 13 for raising the cab 5 is attached to the upper end portion of the parallel link supporting bracket 12 so as to be rotatable in the vertical direction. The cab raising parallel link 13 is separated from the upper and lower sides. The upper long side link member 14 and the lower long side link member 15 which oppose each other are provided. Further, one end portions of the long side link member 14 and the long side link member 15 are pivotally supported by a horizontal pin 16 and a horizontal pin 17 provided vertically apart from the upper end portion of the parallel link support bracket 12, respectively.

  Further, the other end of the upper long side link member 14 and the other end of the lower long side link member 15 are pivotally connected via a short side link member 18 (vertical link member) extending in the vertical direction. Yes. That is, a horizontal pin 19 and a horizontal pin 20 are provided at the upper end portion and the lower end portion of the short side link member 18, respectively, and the other end portions of the long side link members 14 and 15 are pivoted on the horizontal pins 19 and 20, respectively. It is worn.

  Further, a cab raising cylinder 21 is interposed between the intermediate portion of the upper long side link member 14 and the lower end portion of the parallel link support bracket 12. The link members 14, 15, 18 rotate in the vertical direction about the horizontal pins 16, 17 of the bracket 12 by the expansion / contraction of the cab raising cylinder 21.

A connection bracket 22 is fixed substantially horizontally at the lower end portion of the short side link member 18 of the parallel link 23 for raising the cab, and the connection bracket 22 extends forward by a predetermined length. Further, on the connection bracket 22, a cab-extending parallel link 23 for extending the cab 5 forward is attached so as to be rotatable in the front-rear direction. The cab-extending parallel link 23 is separated from the front and rear. The front link member 24 and the rear link member 25 are opposed to each other. Further, lower ends of the front link member 24 and the rear link member 25 are pivotally supported by a front horizontal pin 26 and a rear horizontal pin 27 provided on the connection bracket 22, respectively.

  Reference numeral 28 denotes a gantry horizontal link member. The horizontal link member 28 is provided with a front horizontal pin 29 and a rear horizontal pin 30. A front link member 24 and a rear link member 25 are pivotally attached to the front horizontal pin 29 and the rear horizontal pin 30, respectively. Further, the cab 5 is mounted on the horizontal link member 28.

  A cab overhanging cylinder 31 is interposed between an intermediate portion of the front link member 24 and a rear end portion of the connection bracket 22. As the cab overhanging cylinder 31 expands and contracts, the cab overhanging parallel link 23 pivots about the horizontal pins 26 and 27 of the bracket 22 so as to be movable in and out in the front-rear direction.

  With the above configuration, when the cab 5 is raised, the cab raising cylinder 21 is extended upward, so that the cab raising parallel link 13 is moved upward from a downward inclined position to an upward inclined position when stored. Turn to. Then, as the parallel link 13 rotates, the connection bracket 22 and the horizontal link member 28 rise as shown in FIG. 2, and the cab 5 on the horizontal link member 28 moves upward.

Next, when the cab 5 is extended, the cab extension cylinder 31 is extended to the front upper side, so that the cab extension parallel link 23 is moved forward from the rearward tilted posture to the forward tilted posture. Rotate. Then, as the parallel link 23 rotates, the horizontal link member 28 moves forward as shown in FIG. 3, and the cab 5 on the horizontal link member 28 projects forward.

Here, when the cab 5 is extended, the tip end portion of the parallel link 23 for extending the cab rises while drawing an arc with respect to the connection bracket 22. Accordingly, the horizontal link member 28 fixed to the tip of the parallel link 23 is also displaced upward by the amount of the arc. Thus, the upward displacement amount of the cab 5 is a total value obtained by adding the upward displacement amount due to the arc motion of the parallel link 23 for extending the cab to the upward displacement amount due to the rotation of the parallel link 13 for raising the cab. .

  Thereafter, when the cab 5 is stored during transportation or suspension of the hydraulic excavator 1, the cab overhanging cylinder 31 and the cab raising cylinder 21 are shortened, and the cab overhanging parallel link 23 and cab raising By rotating the parallel link 13 downward, the cab 5 is stored in its original position.

  Next, the effect of the present embodiment will be described in detail in comparison with a hydraulic excavator (comparative example) 33 equipped with a conventional cab lifting device. Here, in the comparative example, as shown in FIG. 6, a first parallel link 36 is pivotally supported by a horizontal bracket 35 fixed to the upper swing body 34, and a cylinder 37 is interposed between the parallel link 36 and the bracket 35. Has been. A bracket 38 is attached to the tip of the first parallel link 36, and a second parallel link 39 is pivotally attached to the front end of the bracket 38. Further, a cylinder 40 is interposed between the parallel link 39 and the bracket 38, and a gantry 42 is attached to the tip of the parallel link 39.

  In the comparative example, when the cab is stored, as shown in FIG. 7, since the second parallel link 39 is stored between the cab 41 and the first parallel link 36, the cab 41 and the turning center C2 are stored by the stored amount. The distance L2 becomes longer.

In contrast, in the present embodiment, the parallel link 23 for extending the cab is stored at a position directly below the cab 5, so that a front and rear space for storing the parallel link 23 becomes unnecessary. Therefore, as shown in FIG. 4, the distance L1 between the cab 5 and the turning center C1 is shortened by the storage space (about 1/5 of the distance L2). Therefore, since the overall length of the hydraulic excavator 1 is also shortened, the transportation efficiency of the hydraulic excavator 1 is improved.

  Further, in the comparative example, as shown in FIGS. 8 and 9, it is necessary to operate the cab 41 in an ascending operation and an overhanging operation in correlation with each other. Since the cab-extending parallel links 23 can be independently operated, the operability of the ascending operation and the extending operation is improved, and the range of selectable cab positions is expanded.

  Further, in the comparative example, as shown in FIG. 6, the range in which the forward and backward movement is possible in the front work area S2 is limited to about 8.5 m, but in this embodiment, the turning radius of the cab 5 is small. Therefore, the interference range in the front work area S1 disappears by that much. As shown in FIG. 5, the range in which the work tool 10 can be moved back and forth is expanded to about 10 m (about 17.6% increase).

  In particular, when only the cab raising parallel link 13 is turned upward from the horizontal posture toward the backward leaning posture, the cab 5 approaches the turning center C1 side as it rises. When raised, the turning radius of the cab 5 is minimized.

  When the object to be crushed in the stationary crushing device M is gripped by the work tool 10 and operated, the hydraulic excavator 1 is moved as close as possible to the outer wall of the crushing device M with the turning radius minimized. Since the working tool 10 can be moved to a desired point in the crushing apparatus M, it is possible to easily and reliably grip the object to be crushed.

  It should be noted that 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 which shows one Embodiment of this invention and shows the cab raising apparatus of a hydraulic shovel. The side view which shows the time of the raise of the cab raising apparatus of FIG. The side view which shows the time of extension of the cab raising apparatus of FIG. The side view which shows the time of accommodation of the cab raising apparatus of FIG. The side view explaining the work area | region of the cab raising apparatus of FIG. The side view of the conventional cab raising apparatus of a hydraulic excavator. The side view which shows the time of accommodation of the conventional cab raising apparatus of FIG. The side view which shows the time of the raise of the conventional cab raising apparatus of FIG. The side view which shows the time of extension of the conventional cab raising apparatus of FIG.

Explanation of symbols

1 Hydraulic excavator (Swivel work machine)
2 Lower traveling body 3 Swing mechanism 4 Upper revolving body 5 Cab 6 Boom 7 Boom cylinder 8 Arm 9 Arm cylinder 10 Work tool 11 Bucket cylinder 12 Parallel link support bracket 13 Parallel links 14 and 15 for raising the cab Long side link members 16 and 17 Horizontal pin 18 Short side link member (vertical link member)
19, 20 Horizontal pin 21 Cylinder for raising cab (hydraulic drive means)
22 Connection bracket 23 Parallel link for cab overhang
24, 25 Link members 26, 27 Horizontal pin 28 Mounting / horizontal link members 29, 30 Horizontal pin 31 Cab extending cylinder (hydraulic drive means)

Claims (2)

The upper swing body is mounted on the lower traveling body in a freely swingable manner, a vertically long parallel link support bracket is erected on the upper swing body, and the cab is lifted with a pair of upper and lower link members at the upper end of the parallel link support bracket. The parallel link is pivotally pivotable in the vertical direction, the tip portions of the pair of upper and lower link members are pivotally connected by a vertical link member, and a connection bracket is fixed to the vertical link member substantially horizontally,
Further, a cab-extending parallel link having a pair of front and rear link members is pivotally mounted on the connection bracket so as to be pivotable in the front-rear direction, and the upper ends of the pair of front and rear link members are pivoted by a horizontal link member serving as a gantry. And a cab is mounted on the horizontal link member that also serves as a frame,
The cab rises as the cab-lifting parallel link rotates upward from a downwardly inclined position when retracted to an upwardly inclined position, and the parallel link for extending the cab tilts forward from a backwardly inclined position when retracted. A cab raising device, characterized in that the cab raising device is configured to project as it rotates forward toward a posture. The cab raising parallel link is driven by a raising cylinder provided between the cab raising parallel link and the parallel link support bracket, and the cab extension parallel link is connected to the cab extension parallel link. 2. The cab raising device according to claim 1, wherein the cab raising device is driven by a cylinder for extension provided between the brackets.

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