JPH0355596Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a hydraulic excavator that is provided with a hook on the tip side of the arm for lifting materials, etc.

BACKGROUND ART As a method of attaching a hook having a crane function to a conventional hydraulic excavator, there is a known method as disclosed in the published utility model publication No. 58-20681 shown in FIGS. 3 and 4. That is, FIG. 3 is a side view of the posture during crane work, where a winch 11' is fixed to the side surface of the base end of the boom 4, and an idler sheave 27 is attached to the side surface of the bent portion of the boom 4. An idler sheave 23 is installed near the pivot point of the arm 6 on the tip side of the boom 4.
However, an idler sheave 24 is rotatably supported on the side surface of the end of the arm 6, and the wire rope 14 is connected to the idler sheave 27, 23, 2 from the winding drum of the winch 11'.
4, the movable pulley 2 hangs down from the tip side of the arm 6, and is further attached with a hook 19'.
2' and the tip is on the tip side of arm 6,
It is tied near the idler sheave 24.
When this hydraulic excavator is used as a crane, the boom 4 and arm 6 are held at appropriate heights, and in this state, the movable pulley 22' is lowered and the material to be hoisted onto the hook 19'. Hook the
The wire rope 14 is hoisted up by the winch 11'.
When excavating with this hydraulic excavator, the movable pulley 22' having a hook 19' is removed from the wire rope 14 as shown in FIG. It can be used like a conventional hydraulic excavator.

Problems to be Solved by the Invention When using a conventional hydraulic excavator with a crane function as described above as a crane or an excavator, the tip of the wire rope 14 tied near the idler sheave 24 must be removed each time. Moving pulley 2
It is necessary to attach and detach the hook 19' together with the hook 2'. Furthermore, since the wire rope 14 is always stretched on the side surface of the arm 6 during excavation work, earth and sand adhere to it. Therefore, when transitioning from excavation work to crane work, it is necessary to perform cleaning, oiling, etc.
Further, during excavation work, the detached hook 19' and movable pulley 22' must be stored and managed separately. Furthermore, during crane work, each sheave and winch are connected to boom 4,
Since it is attached to the side of the arm 6, when a load is hung, a torsional moment is applied to the boom 4 and the arm 6, which may cause strength problems.

Means for Solving the Problems The means of the present invention taken to solve the above problems are as follows: (a) A winch 11 is installed on the bottom side near the base end of the boom 4, and a winch 11 is installed near the intermediate bending part and the boom 4
Near the pivot point of the arm 6, the idler sheaves 20, 20 are supported by pins 17, 17, respectively, and the sheave blocks 15, 15' are pivotally supported, and the shaft 21 is engaged between the sheave brackets 15, 15'. Fix the bracket 26 to be worn,
Further, a bracket 16 is provided near the tip of the lower surface of the arm 6, and the bracket 16 has a space for attaching the sheave block 18 and the idler sheave 20, and a pin having the same diameter as the pin 17 for pivotally supporting the idler sheave 20. The wire rope 14 let out from the winch 11 along the boom 4 and the arm 6 is guided by the idler sheave 20, 20, and the bracket 16 on the tip side of the arm 6 is fixedly installed.
When the hydraulic excavator performs excavation work, the sheave block 18 attached to the bracket 16 at the tip of the arm 6 is moved back and forth between the sheave block 18 attached to the sheave block 18 and the hook block 25 consisting of the hook 19 and the movable pulley 22. At the same time, replace the hook 19 of the hook block 25 with the sheave bracket 15'.
is configured to be hooked onto the shackle 21 and stored.

Operation To shift from the crane working position to the excavating working position, remove the pin that pivots the sheave block provided near the tip of the bottom of the arm to the bracket, and remove the pin that pivots the sheave block near the tip of the bottom of the boom. Attach the above sheave block to the bracket in place of the idler sheave, hook the hook of the hook block to the shackle at the middle of the lower surface of the boom, and wind up the wire rope using a winch to the extent that the wire rope does not loosen. When excavating in this position, all the parts that make up the crane device are fixed to the boom, except for the bracket near the tip of the lower surface of the arm that pivots the sheave block when the crane is in the crane working position, so there are no obstacles to the excavating work. Not.

Embodiments Hereinafter, embodiments of this invention will be described in detail based on the drawings. In FIG. 1, reference numeral 1 denotes a revolving body which is rotatably mounted on a traveling body 3 having crawler tracks 2. At the front of the revolving body 1, a base end portion of a boom 4, which is substantially in the shape of an angle, is pivoted. It is worn. A boom cylinder 5 is provided between the bending part of the boom 4 and the revolving structure 1, and the boom cylinder 5 allows the tip of the boom 4 to freely rotate in the vertical direction.
A proximal end of an arm 6 is pivotally attached to the distal end of the boom 4. An arm cylinder 7 is provided between the proximal end of the arm 6 and the boom 4 for rotating the distal end of the arm 6 in the front-rear direction, and a bucket belt 8 is attached to the distal end of the arm 6. The base end of the bucket 8 is pivotally connected to the arm 6, and is rotatable by the expansion and contraction of a bucket cylinder 9 connected via a link device 10 consisting of an idler link, a push rod, and the like. On the other hand, a winch 11 is fixed to the bottom surface of the boom 4 on the base end side. The winch 11 has a drum 13 that is rotated forward and backward by the power of a hydraulic motor 12 or the like.
A wire rope 1 is attached to this drum 13.
One end of 4 is rolled up. winch 11 drum 1
The wire rope 14 let out from the boom 4 is attached to an idler sheave 20 rotatably supported by a pin 17 on a sheave bracket 15 fixed to the bent lower surface of the boom 4, and near the pivot point of the arm 6 on the tip side of the boom. The idler sheave 20 is rotatably supported by a pin 17 on a sheave bracket 15' fixed to the lower surface, and then the sheave bracket 15' fixed to the lower surface of the distal end side of the arm 6 is connected to the inner dimension and pin insertion hole diameter. It is guided by a sheave block 18 rotatably suspended from an equal bracket 16 by a pin 17, and is reciprocated between the sheave in the sheave block 18 and the moving pulley 22 of a hook block 25 having a hook 19. The end of the sheave block is tied to the sheave block 18 (when an even number is hung) or to the hook block 25 (when an odd number is hung). Furthermore, a bracket 2 is attached to the bottom surface of the boom 4 between the sheave brackets 15 and 15'.
6 is fixedly installed, and a shackle 21 is engaged with the through hole of the bracket 26. Since the present invention has the structure as described in detail above, when starting excavation work using the bucket belt 8, as shown in FIG. and sheave bracket 1
Remove the pin 17 that pivotally supports the sheave 20 at 5',
The sheave block 18 is attached to the sheave bracket 15' with the pin 17, the hook 19 is hooked to the shackle 21 attached to the bracket 26, and the winch 11 is activated to wind the wire rope 14 around the drum 13 to the extent that it does not loosen. Sheave block 18 and hook block 25 are both connected to boom 4.
It is stored in a fixed position on the underside of the The idler sheave 20 on the sheave bracket 15' that has been removed can be stored separately inside the excavator main body, or it can be locked to the bracket 16 with a pin 17, so that it can be stored inside the sheave bracket 15' and the bracket 16. This is convenient because the dimensions and the diameters of the insertion holes for the pins 17, 17 are the same as described above.

In addition, in order to shift from the excavation work position to the crane work position, that is, from the position shown in Fig. 2 to the position shown in Fig. 1, the sheave block 18 is attached to the bracket 16, and the idler sheave 20 is attached to the sheave in almost the reverse procedure to the above. Pins 17 and 17 on bracket 15', respectively.
All you have to do is support it.

Effects of the invention According to this invention, there is no need to attach or detach the hook or movable pulley from the wire rope as in the past, and only the pins of the bracket and sheave bracket can be replaced.
The crane and the sheave block can be easily used alternately for excavation work, and there is no need to worry about storing or losing the hook block.During excavation work, the stored hook block and sheave block do not get in the way at all, and the wire rope is removed from the arm, so there is no need to worry about storing or losing the hook block. , and will not be contaminated by water. In addition, since the brackets and winches that carry loads are located on the center line of the bottom surface of the boom and arm, no torsional moment is applied to the boom or arm, which is advantageous in terms of strength.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the posture of the excavator of the present invention during crane work, Fig. 2 is a side view showing the posture of the excavator of the present invention during excavation work, and Fig. 3 is the crane work of the conventional example. FIG. 4 is a side view showing the posture during excavation work in the conventional embodiment. 1... Revolving body, 3... Traveling body, 11', 11'...
...Winch, 15', 15'... Sheave bracket, 16... Bracket, 18... Sheave block, 20... Idler sheave, 21... Shackle, 25... Hook block.

Claims (1)

[Scope of utility model registration request] A revolving body is rotatably provided on the upper part of the traveling body, a boom, an arm, and a bucket are connected to the front part of the revolving body so as to be rotatable in the front and rear directions in sequence, a winch is provided near the base end of the boom, and A hydraulic excavator is equipped with a sheave block attached to the tip of the arm, a wire rope from a winch is wound around the sheave block and a movable pulley in the hook block, and the hook block is hoisted by winch operation. A winch 11 is attached to the lower surface near the base end of the boom 4, and idler sheaves 20 are attached to the pins 17 and 1 near the intermediate bending portion and near the pivot point between the boom 4 and the arm 6, respectively.
At 7, the sheave brackets 15, 15' for pivotal support are fixed, and a bracket 26 for securing the shackle 21 is fixed between the sheave brackets 15, 15'. A bracket 16 has a space for attaching the idler sheave 20 to the sheave block 18, and a bracket is fixed to the idler sheave 20 with a pin having the same diameter as the pin 17 that pivotally supports the idler sheave 20. It guides the wire rope 14 let out from the winch 11 along the boom 4 and the arm 6 by sheaves 20, 20, and is made up of a sheave block 18, a hook 19, and a movable pulley 22, which are attached to the bracket 16 on the front end side of the arm 6. When the hydraulic excavator performs excavation work, the sheave block 18 attached to the bracket 16 at the tip of the arm 6 is replaced with the sheave bracket 15', and the hook 19 of the hook block 25 is moved back and forth between the sheave block 25 and the hook block 25. A hydraulic excavator having a crane function, characterized in that it is configured to be hooked onto the shaft 21 and stored.