JPH0364653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic excavator with a crane device that allows cargo handling work to be carried out with a bucket attached.

[Conventional technology]

First, the configuration of a general hydraulic excavator will be described with reference to FIG.

A boom 2 that is raised and lowered by a boom cylinder 5 is attached to the front part of the shovel body 1. A boom 2 that is swung by an arm cylinder 6 is connected to the tip of the boom 2. A bucket belt 4, which is rotated by a bucket cylinder 7, is attached by a pin 10. The base end of the bucket cylinder 7 is connected to the rear upper side of the arm 3, and the tip of the piston rod of the bucket cylinder 7 is connected to one end of the first link 8 and the second link 9. First link 8
The other end is connected to the front side surface of the arm 3 by a pin, and the other end of the second link 9 is connected to the upper side plate 4a of the bucket bag 4 by a pin. A plurality of claws 4b are attached to the tip of the bucket 4. As the bucket cylinder 7 expands and contracts, the bucket 4 rotates in forward and reverse directions.

FIG. 26 shows a conventional hydraulic shovel with a crane device in which a hook 101 is attached to the tip of the arm 3 by a pin 102, and the bucket belt 4 is removed.

[Problem that the invention seeks to solve]

In the above-described conventional hydraulic excavator with a crane device, the bucket cart 4 must be removed and the hook 101 must be attached during cargo handling work. In waterworks, sewerage work, and field maintenance, a ditch is excavated and then a hump pipe or U-shaped ditch is laid immediately, but the bucket and hook must be replaced each time, which is time-consuming.

The present invention is intended to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a hydraulic excavator with a crane device that allows cargo handling work to be carried out smoothly without removing the bucket.

[Means for solving problems]

In order to achieve this object, the present invention provides a bucket belt and a pair of left and right links whose upper end attachment portions are located outside the upper side plate of the bucket belt, at the tip of an arm constituting a working machine, using mounting pins. The link is rotatably supported, and a connecting pin hole is provided in the lower part of the link in a direction perpendicular to the pin hole for the mounting pin,
The upper ends of the pair of left and right rods, which have connecting pin holes at the upper and lower ends, are connected to the connecting pin holes by connecting pins, and the hooks are attached to the connecting pin holes at the lower ends of the rods. The hanger is connected by a connecting pin, and the arm is provided with a hook for hanging the hanger or hook.

Furthermore, the present invention is characterized in that a locking means is provided for locking either one of the pair of left and right rods and the hanger to each other.

[Function] During crane work, the left and right pair of links, rods, and hangers are allowed to hang down, the bucket cylinder is shortened to its maximum length, and the tip of the bucket claw is kept away from the hanger.

When storing links, rods, hangers, and hooks, extend the bucket cylinder, place the tip of the claw of the bucket against the plate-like part of the hanger, and then extend the bucket cylinder to store the hook, hanger,
The rod and link are located on the underside of the arm and held in the retracted position via the hook.

〔Example〕

Next, an embodiment of the present invention will be described in FIGS. 1 to 7.
This will be explained using figures.

A bucket belt 4 and a link 11 whose upper end attachment portions are located outside the pair of left and right upper side plates 4a of the bucket belt 4 are attached to the tip of the arm 3 by attachment pins 10. The mounting pin 10 has a longer shaft dimension than that of the bucket-only machine, and is attached to the link 11, the upper side plate 4a of the bucket 4, and the arm 3.
is inserted into the pin hole. The mounting pin 10 is fixed to one upper side plate 4a of the bucket bag 4 by a fixing pin 12. A threaded portion is provided at both ends of the mounting pin 10, and this includes a link 1.
Two nuts 13 are attached to prevent the nut from coming off. The nut 13 is fixed so that the link 11 can rotate without being over-tightened.

Note that both ends of the mounting pin 10 are not limited to the nuts 13, and may be of any other type as long as they can prevent the link 11 from coming off.

A connecting pin hole is provided at the lower end of both links 11 in a direction perpendicular to the pin hole into which the mounting pin 10 is inserted, and the upper end of the symmetrical rod 14 is connected through the connecting pin hole. They are connected by pins 15. The lower ends of the rods 14 are each connected to the outer side of the hanger 16 by a connecting pin 17. That is, a pin hole into which a connecting pin 17 is inserted is provided at the lower end of the rod 14 and at the outer side of the hanger 16. The length of rod 14 is
When the bucket belt 4 rotates due to the extension of the bucket cylinder 7, the tip of the claw 4b is set so as to come into contact with the plate-shaped portion 16g of the hanger 16.

As shown in FIG. 7, a holder 18 is inserted inside the box-shaped structure 16a of the hanger 16.
The holder 18 is supported by pins 19. The pin 19 is attached to the box-shaped structure 16a, and the pin hole of the holder 18 into which the pin 19 is inserted is an elongated hole 18a. A load detector (compression type load cell) 20 is attached inside the holder 18, and a hook 21 is connected to the lower part of the holder 18 by a pin 22. Hook 21 is the 4th
As shown by the arrow in the figure, the hook 21 can be freely rotated via a bearing inside the hook 21. The load from the hook 21 is applied to the pin 22, the holder 18,
The load is transmitted to the load detector 20, which pushes the pin 19 downward and detects the load based on the reaction force. Note that the load detection mechanism is not limited to that of this embodiment, and may include the hanger 16 and the hook 2.
It may be installed between 1 and 1, or
Alternatively, a completely different load detection means such as a hydraulic cylinder pressure detection means may be used. If a tube is used for the rod 14, the cable of the load detector 20 can be passed inside the tube to protect it.

On the lower surface of the arm 3, hangers 16,
Hook fittings 23, 2 for storing the hook 21
4 is attached, and its hook fittings 23, 2
4 has a pin hole for inserting a pin.
A pin hole is provided in the portion of the hanger 16 that is hooked onto the hook 23.

The crane equipment is assembled as follows. First, connect the mounting pin hole at the end of arm 3 and bucket 4.
Align the pin holes of the upper side plate 4a with the mounting pins 10, insert the mounting pins 10 into those pin holes, and
Attach the upper side plate 4 of the bucket 4 with the fixing pin 12.
Fix it to a. Next, the links 11 are fitted to both ends of the mounting pin 10, and the nuts 13 are fitted. The nut 13 is tightened to the extent that the link 11 can rotate freely. And hanger 16 in advance
The assembled rod 14 is connected to the link 11 by a connecting pin 15.

When removing the crane device, connect pin 15
, and remove the rod 14, hanger 16 and hook 21. The link 11 remains attached to the mounting pin 10, but the upper side plate 4 of the bucket 4
Since it is located outside of point a, there is no problem with excavation work using bucket 4.

During cargo handling work, as shown in Fig. 1, the link 11, rod 14, hanger 16, and hook 21 are suspended from the tip of the arm 3, the bucket cylinder 7 is shortened to its shortest length, and the tip of the claw 4b of the bucket 4 is Keep it away from hanger 16. In this state, the suspended load 26 is lifted up via the slinging wire rope 25, the boom cylinder 5 and the arm cylinder 6 are expanded and contracted, and the shovel body 1 is rotated to move the load.

As shown in Figure 4, link 11, rod 1
4. Since the hanger 16 forms a rectangle with the connecting pins 15 and 17 at its vertices, it can be used to pull the slinging wire rope 25 diagonally as shown in FIG. Even if the hanger 16 hits an obstacle as shown by the arrow in the figure, the rod 14 will tilt around the connecting pin 15 and the hanger 16 will only move laterally, so no excessive force will be applied and it will be safe. be.

In this embodiment, the distance between the connecting pins 15 of the left and right links 11 is equal to the distance between the left and right connecting pins 17 of the hanger 16, and the straight line connecting the connecting pins 15 and 17 forms a rectangle. However, a trapezoid may be formed by changing the interval dimension.

When storing the link 11, rod 14, hanger 16, and hook 21, the bucket cylinder 7 is extended and the tip of the claw 4b of the bucket 4 is brought into contact with the plate-shaped portion 16g of the hanger 16. The direction of the connecting pins 15 and 17 is the mounting pin 1, which is the rotation center of the bucket 4.
Since the direction is perpendicular to 0, link 1
1. The rod 14 and hanger 16 swing together as one without bending. If the bucket cylinder 7 and the arm cylinder 6 are further extended, the crane device will be folded to the lower surface side of the arm 3 due to its own weight, as shown in FIG. In this state, as shown in FIG. 3, the hook 21 is held on the hook 24 via the pin 27, and the hanger 16 is held on the hook 23 via the pin 28. Bucket 4 and Link 1
1. Since the center of rotation of the rod 14 and the hanger 16 is the mounting pin 10, the contact portion between the hook 4b of the bucket bag 4 and the hanger 16 does not come off when folded.

When performing excavation work, the crane device is held on the lower surface of the arm 3 by hooks 23 and 24, so it does not interfere with the boom 2, arm 3, and bucket 4 in any way. That is, the boom 2, arm 3, and bucket 4 can be operated to perform excavation work without any trouble.

FIG. 7 shows a state in which the rod 14 is separated from the link 11 and folded toward the hook 21 using the connecting pin 17 as a fulcrum. This allows for compact storage.

Further lifting height of the hook 21 may be required depending on the circumstances of the suspended load. In this case, rod 1
4 and connect the hanger 16 directly to the link 11. An embodiment for this purpose will be explained in detail with reference to FIGS. 8 to 13.

As shown in Figures 9 and 10, link 1
A plate-shaped forked portion 11a is provided on the lower side of the link 11, a pin hole 11b into which a mounting pin 10 is inserted is provided in the upper part of the link 11, and a connecting pin 15 is provided in the forked portion 11a. A pin hole 11c into which the pin hole 11c is inserted is perpendicular to the pin hole 11b. As shown in FIGS. 12 and 13, the upper end of the rod 14 is provided with a coupling boss portion 14a that is inserted into the forked portion 11a of the link 11, and the lower end of the rod 14 is provided with a hanger shown in FIG. A coupling boss portion 14b is provided to be inserted into the 16 forked portion 16b. Dimension A between the forked parts 11a, width dimension D of the joint boss part 14a, width dimension E of the joint boss part 14b, fork part 16b
The width dimension B of the outer surface of the forked portion 16b and the dimension C between the inner surfaces of the forked portion 16b are set as follows: A>B=D C>E. Further, the dimension between the connecting pin holes of the hanger 16 is made the same as the dimension between the pin holes 11c of the link 11. In this way, the rod 14 can be connected to the link 11, or the rod 14 can be removed and the hanger 16 can be directly connected to the link 11 as shown in FIG. In other words, the lift height of the suspended load can be easily changed.

Further, as shown in FIG. 11 and FIGS. 14 to 17, an insertion portion 11d provided in the link 11
Width dimension F, forked part 1 provided at the top of the rod 14
The width dimension G between the inner surfaces of the rod 4c, the width dimension H of the connecting boss portion 14d provided at the bottom of the rod 4, and the dimension C between the inner surfaces of the forked portion 16b of the hanger 16 are set to C=G>F=H. However, the hanger 16 can be directly connected to the link 11 as well.

Furthermore, the shape and dimensions of this embodiment may be reversed (link side, hanger side).

By the way, during excavation work, the excavated soil (especially gravel and small rocks) fills the bucket 4.
When the bucket 4 is held on the side of the arm 3, the force of the bucket cylinder 7 causes the excavated soil near the claw 4b to press the hanger 16 against the arm 3 as shown by the arrow in FIG. The crane device has a mounting pin 10 and a protrusion 16 formed on the hanger 16 for the arm 3.
Since they are in contact at two points c, the hanger 16 tries to rotate and deform counterclockwise around the protrusion 16c. Therefore, a large bending force is applied to the rod 14, which may cause deformation or damage.

Figures 18 to 20 and 21 and 2
Figure 2 shows a different embodiment that avoids the above-mentioned drawback.

The embodiment of FIGS. 18 to 20 shows the hanger 1
A protrusion 16c and another protrusion 16d are formed on the hanger 16.
When stored in the arm 3, it should touch the bottom surface of the arm 3 slightly or leave a slight gap.

In this way, the pressing force of the excavated earth and sand against the hanger 16 due to the force of the bucket cylinder 7 is reduced by the force of both protrusions 16.
The force is transmitted to the lower surface of the arm 3 through two points 16d and 16d, and no unreasonable force is applied to the rod 14.

21 and 22, the hanger 1
6 is provided with an upper plate protrusion 16e in addition to the protrusion 16c. The protruding height of the upper plate protrusion 16e is such that when the hanger 16 is stored in the arm 3, it slightly contacts the lower surface of the arm 3 or leaves a slight gap. This embodiment also provides the same functions and effects as those of the previous embodiment.

Now, since the link 11, rod 14, and hanger 16 of the above-mentioned crane device shown in FIGS. 1 to 6 form a rectangle with the connecting pins 15 and 17 as their vertices, the lower surface of the arm 3 as shown in FIG. When stored in the 25th rectangle due to weight imbalance
As shown in the figure, the hanger 16 is crushed and the center of the hanger 16 is greatly deviated from the center of the arm 3.
4 and 23 will no longer be able to be latched.

The embodiments shown in FIGS. 23 and 24 are designed to solve this problem, and are provided with locking means for locking either the left or right rod and the hanger to each other.

In the embodiment shown in Fig. 23, a stay 29 is swingably attached to one of the rods by a pin 32, and during normal cargo handling operations, the stay 29 is held parallel to the rod 14 as shown by the chain line 29'. .
When storing the crane device and putting it into the excavation work state, the stay 29 is swung as shown by the solid line, and the connecting part at the tip is connected to the hanger upper plate 1 by the pin 30.
Connect to 6f. As a result, the rod 14 and the hanger 16 are locked by the connecting pin 17 and the stay 29, thereby preventing mutual movement. If the crane device is swung to the storage position in this state, the hanger 16 will surely fall to the center of the arm 3 without crushing the aforementioned original rectangle. Therefore, the crane device can be smoothly held in the storage position via the hooks 23 and 24.

In the embodiment shown in FIG. 24, a pin hole for the connecting pin 17 and a pin hole for the fixing pin 31 are bored in the rod end plate 14d provided at the end of one rod 14 on the hanger 16 side, and a pin hole for the connecting pin 17 and the fixing pin 31 are made. There are two pin holes for the connecting pin 17 and the fixing pin 31 on the upper plate 16f.
It has a pin hole. During normal cargo handling work, the fixing pin 31 is removed, and when carrying out excavation work with the crane device stored, the fixing pin 31 is attached to the rod end plate 14d and the hanger top plate 1.
Insert into the 6F pin hole. As a result, rod 1
4 and the hanger 16 are locked by the connecting pin 17 and the fixing pin 31 to prevent mutual movement.

When storing the crane device, if the rod 14 and hanger 16 are kept locked by the above-mentioned locking means, the crane device will not shift laterally with respect to the arm 3, and the work can be carried out safely.

〔Effect of the invention〕

According to the present invention described above, it is possible to carry out cargo handling work without any hindrance with the crane device with the bucket attached, and at the same time, during excavation work, the crane device can be reliably stored on the underside of the arm and the excavation work can be carried out smoothly. I can do it.

[Brief explanation of drawings]

Fig. 1 is a side view showing a hydraulic excavator equipped with a crane device according to the present invention, Fig. 2 is a side view showing a state in which the crane device of the hydraulic excavator of Fig. 1 is being retracted from the arm, and Fig. 3 is a side view showing the crane device of the hydraulic excavator shown in FIG. 1 stored in the arm, FIG. 4 is a cross-sectional front view showing one embodiment of the crane device of the present invention, and FIG. 5 is the crane device shown in FIG. 4. Fig. 6 is a front view showing the hanger of the crane device shown in Fig. 4 in a pressed state, and Fig. 7 is a side view showing the crane device shown in Fig. 4 with the rod and hanger removed from the link. FIG. 8 is a front view showing the hanger of the crane device according to the present invention attached directly to the link, and FIGS. 9 to 13 show the hanger being attached directly to the link. Fig. 9 is a side view of the link, and Fig. 10 is a side view of the link in Fig. 9.
11 is a side view showing a part of the hanger, FIG. 12 is a front view of the rod, and FIG. 13 is a side view showing a part of the hanger.
2 is a side view, and FIGS. 14 to 17 show the components of another embodiment of the crane device according to the invention, in which the hanger can be attached directly to the link; FIG. 14 is a side view of the link; Fig. 15 is a cross-sectional front view of Fig. 14, Fig. 16 is a front view of the rod, Fig. 17 is a side view of Fig. 16, and Fig. 18 shows the present invention in which the hanger is provided with two protrusions that touch the arms. Fig. 19 is a side view showing an embodiment of the crane device according to Fig. 18;
Figure 0 is an enlarged cross-sectional view of Figure 18, and Figure 21.
The figure is a side view showing another embodiment of the crane device according to the present invention in which the hanger is provided with two protrusions that touch the arms, Figure 22 is an enlarged sectional view taken along line XII-XII of Figure 21, and Figure 23 shows the stay FIG. 24 is a front view showing an embodiment of the crane device according to the present invention in which a rod and a hanger are engaged with each other through a pin; FIG. , FIG. 25 is an explanatory front view of the crane device according to the present invention, and FIG. 26 is a side view showing the crane device in a conventional hydraulic excavator.

Claims (1)

[Scope of Claims] 1. At the tip of an arm constituting a working machine, a bucket and a pair of left and right links whose upper end attachment portions are located outside the upper side plate of the bucket can be freely rotated by a mounting pin. A connecting pin hole is provided in the lower part of the link in a direction perpendicular to the pin hole for the mounting pin, and a pair of left and right connecting pin holes are provided in the upper and lower ends of the link. The upper ends of the rods are connected by connecting pins, the hangers with hooks attached are connected to the connecting pin holes at the lower ends of the rods, and the hangers or hook fittings are provided on the arms. A hydraulic excavator with a crane device. 2. The hydraulic excavator with a crane device according to claim 1, wherein the distance between the connecting pin holes of the pair of left and right links is equal to the distance between the left and right connecting pin holes of the hanger. 3. Claim 1 in which the hanger is provided with a plurality of protrusions that come into contact with the lower surface of the arm when the hanger is held by the arm via a hook fitting.
Hydraulic excavator with crane device as described in section. 4 At the tip of the arm constituting the work machine, a bucket and a pair of left and right links whose upper end attachment portions are located outside the upper side plate of the bucket are rotatably supported by mounting pins, and the lower part of the link is A connecting pin hole is provided in a direction perpendicular to the pin hole for the mounting pin, and the upper end portions of a pair of left and right rods having connecting pin holes provided at the upper and lower ends are respectively inserted into the connecting pin hole. A hanger with a hook attached is connected to the connecting pin hole at the lower end of the rod using a connecting pin, a hanger or hook fitting is provided on the arm, and a hook is attached to either the left or right side of the rod. A hydraulic excavator with a crane device, characterized in that a locking means for locking a rod and a hanger to each other is provided.