JPH0553900B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an excavator used for excavating and removing earth and sand in civil engineering and construction work, and particularly relates to This invention relates to an excavator with a crane, characterized in that the crane mechanism is housed in the holder and the crane mechanism is not exposed from the outside.

[Conventional technology]

BACKGROUND ART Excavators that have a swinging boom connected to an arm and a bucket attached to the tip of the arm have been widely used for digging trenches and holes.
And this excavator (also called Batskuhoe)
has been widely used in road construction and burial work.

The function of this excavator is to dig deep into the ground, and it is extremely effective for digging and removing large amounts of earth and sand using mechanical power.
This greatly improves work efficiency compared to manual labor.

Now, at the work site of trench digging and hole digging,
In addition to the work of digging out the earth and sand, there was also the work of burying pipes and pipes after digging them out, and covering the holes with iron plates, etc. When lifting heavy objects, there is no problem if the work can be done manually, but for example, when lifting heavy humid pipes or iron plates, a special crane truck must be used. It was something extraordinary. This is because lifting heavy objects requires a crane mechanism equipped with a specialized safety mechanism to meet the work standards.

However, at sites where excavators are working, there are only a few work processes where crane trucks may be used simultaneously, and two
It is normally impossible to have two vehicles ready at the same time. Furthermore, in a work site where the left and right sides are narrow, it is limited to bringing only an excavator to the site, and it is impossible to bring in additional crane trucks due to the small area. Furthermore, the work of lifting heavy objects can be completed in an extremely short time compared to the work of excavating earth and sand, and if a dedicated crane truck with only the lifting function is used, the actual working time of the crane truck is wasted. It took a lot of time.

For this reason, when lifting workpieces during excavation work, conventional methods often involve hooking a wire to the bucket of an excavator and moving a swinging boom that supports the bucket up and down to lift the load. The current situation was that people were lifting things. It is extremely easy to hoist heavy objects by hooking a wire onto a bucket, but excavators are not designed to lift heavy objects, so the wire may come off the bucket. It is extremely dangerous. Also,
Because the excavator was used in a manner that deviated from its original function, the limit of the weight that could be lifted was unknown, and the excavator was used to perform highly dangerous work.

[Problem that the invention seeks to solve]

As described above, in the past, it was illegal and dangerous to use an excavator as a substitute for a crane, so it had to be avoided. For this reason, the inventor decided to fix a crane mechanism to the side of the rocking boom of the excavator to provide a lifting function. However, if a crane mechanism is attached to the side of the swinging boom of an excavator, the appearance of the excavator itself will be unsightly, and since the crane mechanism is exposed to the outside, the crane mechanism may become an obstacle during excavation work. They were often damaged by contact and were extremely difficult to use.

[Means for solving problems]

The present invention consists of a movable vehicle body, a swinging boom that is bent into a dogleg shape and one end of which is connected to the front side of the vehicle body so as to be able to swing vertically; It has an arm that is freely connected, a bucket that is connected to the tip of the arm so that it can swing up and down, and a crane mechanism that is housed along the length of the straight part of the swinging boom on the side where the arm is connected. In an excavator, this crane mechanism has multiple cylindrical booms that can telescopically expand and contract in the length direction, and the length when contracted is set slightly shorter than the straight section of the swinging boom. The large-diameter boom is fixed inside the swinging boom, and the extending and contracting length direction is directed toward the connecting part of the swinging boom's arm. A temporary fixing mechanism is installed at the end of the small-diameter boom that is suspended and expands and contracts to hold the hook at the end of the boom by pulling a wire. To provide an excavator with a crane, characterized in that a connecting part of the swinging boom is opened, and multiple stages of booms are extended and contracted forward through the opening opened in the connecting part of the arm and the swinging boom. be.

[Effect]

The present invention shows a structure in which a crane mechanism is housed inside a cavity of a swinging boom. When lifting heavy objects, the arm is turned so as to approach the inside of the swinging boom, and the bucket is stored under the swinging boom. For this reason, the connecting part between the arm and the swinging boom has a large opening in the front, and when the boom of the crane mechanism is extended from this open space, the multiple stages of telescopic booms are extended, and the crane mechanism will extend in front of the excavator. At the tip of this extended crane mechanism, there is a hook suspended from a wire, which can be used to lift heavy objects. Since this crane mechanism can be housed in the internal cavity of the straight section of the swinging boom, the crane mechanism is not exposed to the outside during excavation work. For this reason,
Accidents in which obstacles come into contact with the crane mechanism can be prevented, and causes of malfunctions can be prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

There are front wheels 2 and rear wheels 3 on the front, rear, left and right sides of the vehicle body 1, respectively.
is pivotally supported, and an annular crawler 4 is wound around between the front wheel 2 and the rear wheel 3. A swivel base 5 that can rotate 360 degrees with respect to the vehicle body 1 is mounted on the top of the vehicle body 1, and a swing boom 6 bent into a dogleg shape is mounted at the center of the front surface of the swivel base 5. It is pivoted so that it can swing downward. Two hydraulic cylinders 7 are interposed between the left and right sides of the swinging boom 6 at a slightly intermediate position and the swivel base 5.
The structure is such that it can be tilted up and down. An arm 8 is connected to the tip of the swinging boom 6, and a bucket 9 is connected to the tip of the arm 8. A hydraulic cylinder 10 is interposed between the swinging boom 6 and the arm 8, and a hydraulic cylinder 11 is also interposed between the arm 8 and the bucket 9. Note that on the upper surface of the swivel base 5, on the front side,
A cabin 12 in which a driving vehicle appears is fixed, and a drive mechanism 13 housing an engine and the like is placed at the rear of the swivel base 5. These structures are the same as those of conventionally well-known excavators.

A crane mechanism 15 is housed inside the straight portion on the tip side of the swinging boom 6 bent into a dogleg shape. This crane machine 15 has a built-in hydraulic cylinder, and can be expanded and contracted in three stages as a whole, and has a conventionally well-known structure.

The crane mechanism 15 includes a main boom 16 fixed to a swinging boom 6, a middle boom 17 housed inside the main boom 16 so as to be able to move forward and backward, and a tip boom inserted into the middle boom 17 so as to move forward and backward. 18
It has a structure that can be expanded and contracted in three stages in a telescopic manner. This former boom 16
The length is approximately the same as the length from the center to the tip of the swinging boom 6, and the opening at the tip of the former boom 16 is located near the connection point between the swinging boom 6 and the arm 8. A head 19 housing a pulley, etc. for reversing the wire 20 is fixed to the tip of the front boom 18, and a hook receiver 21 is suspended from the wire 20 hanging down from the head 19. This hook receiver 21
A hook 22 is fixed to the lower end of. Further, a winding machine 25 is fixed at the center of the back side of the swinging boom 6, and a winding drum 26 of this winding machine 25 is fixed.
One end of the wire 20 is wound around.
The wire 20 extends in the direction of the head 19 and is reversed within the head 19 to face the hook receiver 21.

Next, FIG. 6 shows the head 19 and the hook receiver 2.
The area around 1 will be explained in an enlarged manner.

The hook receiver 21 has the shape of a steel plate bent into a slightly U-shape, and the lower end opening of the U-shape faces downward.
1 are positioned vertically.
Pulleys 32 and 33 are inserted between the shaft support plates 30 and 31, respectively.
2 and 33 are rotatably supported by a shaft 34 held by shaft support plates 30 and 31. Further, a U-shaped reversal body 35 is connected to the outside of the shaft support plates 30 and 31 as a temporary fixing mechanism, and the reversal body 35 is connected to the shaft support plates 30 and 31 by a shaft 36.
It is pivoted on 1. This shaft 36 is slightly offset from the shaft 34 toward the boom 18 side. Also, on both sides of the shaft support plates 30 and 31, the shaft 3
At a position above 4, a stopper 37 that comes into contact with the reversing body 35 is fixed and protrudes to the left and right.

Further, a pulley 38 is pivotally supported inside the hook receiver 21. The aforementioned wire 20 is pulled out from the winding drum 26 and first passed through the pulley 32.
After being flipped downward by the hook receiver 21, it is flipped upward by the pulley 38 in the hook receiver 21. Then, as the wire 20 moves upward, it passes through the pulley 33.
its direction is reversed downwards, and the wire 20
The tip of the hook receiver 21 is connected to the upper part of the hook receiver 21.

Next, the operation of this embodiment will be explained.

FIGS. 1 and 2 show the state of the excavator when lifting a heavy object using the crane mechanism 15. The hydraulic cylinders 10 and 11 are extended to the maximum extent, and the arm 8 is connected to the swinging boom 6.
The bucket 9 is rotated so as to face the bottom surface of the boom 6, and the bucket 9 is stored so as to be rolled up under the swinging boom 6. When the crane mechanism 15 is operated, these hydraulic cylinders 10 and 11 are not operated.

In this state, the hook 22 of the crane mechanism 15 is slung onto the hook 22, and the work of lifting a heavy object can be performed.

First, the middle boom 17 and the front boom 18 are extended along their lengths from the main boom 16, and the head 19 is moved above the heavy object to be lifted. Then, the winding machine 25 is operated, and the wire 2
The length of the wire 20 is adjusted by unwinding the wire from the winding drum 26, and the hook 22 is brought close to the top of the heavy object by moving the hook receiver 21 up and down. Thereafter, heavy objects can be lifted by slinging them onto the hooks 22. This lifting is done by operating the winding machine 25 and
0, but if necessary, the hydraulic cylinder 7 can be expanded and contracted to adjust the depression angle of the swinging boom 6 and change the inclination angle of the entire crane mechanism 15.

Then, the position of the heavy object is moved by extending and contracting the middle boom 17 and the front boom 18 from the main boom 16, but if the distance to be moved is long, the crawler 4 is operated with the heavy object once lifted, By moving the entire vehicle body 1, heavy objects can be carried to another work site.

Next, a description will be given of the procedure for stopping the work of suspending heavy objects in FIGS. 1 and 2 and proceeding to the work of excavation.

First, the wire is wound in the direction of the winding drum 26 by activating the winding device 25 and rotating the winding drum 26. Therefore, the wire 20 is wound up one after another, and the pulleys 32, 3
3 and 38, pull the hook receiver 21 upward. This state is the state shown in FIG. 7A.

When the wire 20 is wound up, finally,
The hook receiver 21 comes into contact with the lower end of the inverter 35 (see FIG. 7B). When this state is reached, the hook receiver 21 cannot be lifted any further. When the wire 20 is further wound up,
Since the hook receiver 21 is in contact with the lower surface of the reversing body 38, its lifting force acts in the direction of lifting the hook receiver 21 and the reversing body 35 as a whole around the shaft 36. Therefore, as shown in FIG. 7C, the hook receiver 21 and the inverter 35 are rotated upward about the shaft 36, and the inverter 35 is rotated until it contacts the stopper 31. Then, the hook receiver 21 and the inverter 35 are fixed to the stopper 37, and the hook receiver 21 and the inverter 3 are fixed to the stopper 37.
5 is held integrally with the head 19. Therefore, the hook receiver 21 and the hook 22 do not hang down from the lower part of the head 19 and are fixed integrally with the head 19 without swinging or fluctuating.

After this, the middle boom 17 and the front boom 18 are each pulled toward the original boom 16, and the crane mechanism 1
Shorten the total length of 5. At this time, the rotational speed of the winding drum 26 of the winding machine 25 is adjusted in synchronization with the amount of movement of the middle boom 17 and the front boom 18, and the rotational speed of the winding drum 26 of the winding machine 25 is adjusted.
is maintained in such a state that it does not separate from the stopper 37. In this way, when the swinging body 35 is held in contact with the stop bar 37, it can pass between the swinging boom 6 and the arm 8, and even if the middle boom 17 and the front boom 18 are moved, the swinging body 35 remains in contact with the stop bar 37. The receiver 21 and the hook 22 can be smoothly stored inside the swinging boom 6 without coming into contact with the swinging boom 6, the arm 8, etc.

In this way, the middle boom 17, the front boom 18
The state shown in FIG. 3 is the state in which the crane mechanism 15 is housed within the swinging boom 6 by reducing the size of the crane mechanism 15.

In the state shown in FIG. 3, the crane mechanism 15 is not exposed from the outside, and the appearance is the same as that of a normal excavator.
By operating 0 and 11 in coordination with each other, the swinging boom 6, arm 8, and bucket 9 can be interlocked to perform conventionally known excavation work.

〔Effect of the invention〕

Since the present invention is constructed as described above, the same excavator can perform the work of digging up earth and sand and the work of suspending heavy objects, and both functions can exhibit their respective abilities. When lifting heavy objects, a special crane mechanism is used, which makes it possible to lift heavy objects reliably and safely. It becomes possible to use it in a regular manner, rather than in the usage method.
Furthermore, since the entire crane mechanism can be housed in the internal cavity of the boom, the crane mechanism is not exposed from the outside, resulting in an extremely sleek design. Further, since the crane mechanism is not exposed to the outside, obstacles do not come into contact with the crane mechanism during excavation work, and causes of failure can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an excavator with a crane showing an embodiment of the present invention, Fig. 2 is a side view showing the above crane mechanism in an extended state, and Fig. 3 shows the crane mechanism housed in the boom. FIG. 4 is a side view showing the condition for performing excavation work; FIG. 4 is a partially cutaway side view showing the excavation mechanism inside the boom;
FIG. 5 is an enlarged view showing the structure of the crane mechanism near the tip of the boom, FIG. 6 is an enlarged view showing the vicinity of the head, and FIG. 7 is an explanatory view showing the operation of the hook receiver and the reversing body. 6... Boom, 8... Arm, 15... Crane mechanism, 16... Original boom, 17... Middle boom,
18... Tip boom, 19... Head, 20... Wire, 21... Hook receiver, 22... Hook,
35...Reverse body as a temporary fixing mechanism.

Claims (1)

[Claims] 1. A movable vehicle body, a swinging boom bent into a dogleg shape and one end of which is connected to the front side of the vehicle body so that it can swing up and down, and the other end of this swinging boom is connected to the other end of the swinging boom so that it can swing up and down. An excavator that has an arm, a bucket that is connected to the tip of the arm so as to be able to swing up and down, and a crane mechanism that is housed along the length of the straight part of the swinging boom on the side where the arm is connected, This crane mechanism has multiple cylindrical booms that can telescopically expand and contract in the length direction, and the length when contracted is set to be slightly shorter than the straight part of the swinging boom.
The large-diameter boom is fixed inside the swinging boom, and the extending and contracting length direction is directed toward the connecting part of the swinging boom's arm. A temporary fixing mechanism is installed at the end of the small-diameter boom that is suspended and expands and contracts to hold the hook at the end of the boom by pulling a wire. An excavator with a crane characterized in that a connecting part of a swinging boom is opened, and multiple stages of booms are extended and contracted forward through the opening opened in the connecting part of the arm and the swinging boom.