JPH0694677B2 - Lifting device - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a hoisting device, and more particularly to a hoisting device attached to an excavator called a backhoe.

[Prior art]

When constructing retaining walls, excavators called backhoes and hydraulic excavators are frequently used. This is the tip of the beam whose direction and angle are variable by hydraulic drive,
The bucket is rotatably attached, and the bucket can be rotated by hydraulic drive. FIG. 7 shows an example of this, in which the shovel bucket 6 is attached to the tip of the beam 5 with the shaft 51 and the beam 5
The bucket cylinder 7 arranged above is connected to the shovel bucket 6 via a rod 61 and to the beam 5 via a link 62. In the figure, 52 is a shaft connecting the rod 61 and the shovel bucket 6, 53 is a shaft connecting the link 62 and the beam 5, 54 is a bucket cylinder 7, the rod 61 and the link 62. It is the axis. On the other hand, when constructing a retaining wall, when stacking a retaining block on the retaining wall, since each block has a weight of about 40 kg, without a lifting device such as a crane, it would be a great effort and risk. Will be accompanied by. However, since it is costly to separately provide a crane, it is necessary to use the above-mentioned excavator, for example, to suspend the intelligent block from the shovel bucket 6 via a winch, or replace the shovel bucket 6 with it. It is conceivable to attach a lifting device to the tip of the beam 5.

[Problems to be Solved by the Invention]

However, in the former case, the speed of raising and lowering the intelligence block is only low, and the range in which the winch can be moved up and down is small, so for work in a place with a large height difference,
There is a problem in terms of work efficiency. In the latter case, by selecting a hoisting device having a large vertical range and a high speed, the above problems are eliminated, but excavation work by the shovel bucket 6 and hoisting are repeatedly performed. Shovel bucket 6
The trouble of replacing the lifting device with the lifting device becomes a problem. The present invention has been made in view of the above points, and an object of the present invention is to improve the working efficiency in a hoisting device attached to an excavator, by which the hoisting speed of an object to be hoisted can be easily increased. It is an object of the present invention to provide a hoisting device that can realize the above-mentioned measures and can promptly deal with the case where the excavation work and hoisting are repeatedly performed by the excavator.

[Means for Solving the Problems]

Thus, the present invention provides a retractable arm arranged on a beam to which a bucket of an excavator is mounted at the tip, and a bucket cylinder for driving the bucket, which is rotatably connected to the arm and has one end. It is characterized in that it is provided with a lever which is detachably connected, and a lifting wire is laid between sheaves provided at the other end of the lever and the tip of the arm. [Operation] According to the present invention, when the bucket cylinder and the lever are connected, a slight movement of the lever is amplified by the lever and the sheave and is transmitted to the lifting wire.
It is possible to obtain a large lifting amount, and because the bucket at the tip of the beam is not used and the arm is extendable, the lifting work and excavation using the bucket interfere with each other. There is no such thing. [Examples] The present invention will be described in detail below with reference to the illustrated examples.
FIG. 2 and FIG. 2 show an embodiment, in which 5 is a beam in an excavator. Then, as described in the above-mentioned conventional example, the shovel bucket 6 which is rotationally driven by the bucket cylinder 7 is attached to the tip of the beam 5. The lifting device is formed as an arm 1 and a lever 2 arranged on the beam 5, and sheaves 4, 4 provided at the tip of the arm 1 and the tip of the lever 2. The arm 1 here comprises a fixed arm 11 fixed to the beam 5 and a movable arm 12 slidably engaged with the fixed arm 11, and the movable arm 12
It is a flexible item whose total length changes depending on the slide of
The expansion / contraction drive mechanism 5 arranged in the fixed arm 11 expands and contracts. As shown in FIG. 4, the extension / contraction drive mechanism 5 includes a cylinder 50 attached to the fixed arm 11 and two sheaves 52, 5 attached to the rod of the cylinder 50.
3 and two sheaves 5 fixed at both ends in the fixed arm 1
1, 54, one end is attached to the base end side of the fixed arm 11 and the other end is attached to the tip end side of the movable arm 12 and the sheaves 51, 52.
And a wire 56 that is attached to the distal end side of the fixed arm 11 and the other end to the proximal end side of the movable arm 12 and that is attached to the sheaves 53 and 54. As shown in FIG. 4 (b), when the cylinder 50 is extended, the distance increases. The wire 55 laid over the sheaves 51 and 52 retracts the movable arm 12 to contract the arm 1 and shorten the cylinder 51. If the wire 56 is laid over the sheaves 53, 54, the distance between which increases.
Is sent out and the arm 1 extends. The lever 2 has a shaft 20 on the fixed arm 11 side near its one end.
It is rotatably attached by means of a pin 21 and 22, and a connecting plate 23 is fixed to one end of the connecting plate 23 and the bucket cylinder 7.
Is connected to a connecting plate 70 provided at the tip of the connecting plate 24 by a removable connecting pin 24. The insertion portion of the connection pin 24 on the connection plate 70 side is formed as a long hole 71. The sheaves 4, 4 are connected to the other end of the lever 2 and the movable arm 1
It is provided at the tip of 2. As shown in FIG. 2, here, the sheaves 4 on the rod 12 side are formed by two rows of four cars, and the sheaves 4 on the lever 2 side are formed by two rows of three cars. Then, the lifting wire 3 is hung on the sheaves 4, 4. The lifting wire 3 has one end fixed to the lever 2 and, after passing through the sheave 4 on the arm 1 side and the sheave 4 on the lever 2 side a plurality of times, is hung down through the sheave 4 on the arm 1 side. 1 and 3 at the other end
As shown in the figure, a carrier 8 having a plurality of manual type or electric type winches 9 is attached, and a wire 90 hung from each winch 9 is hooked for suspending a dino block 92. A member 91 such as is attached. The lifting operation in the lifting device thus configured is performed by driving the bucket cylinder 7 to change the distance between the sheave 4 at the tip of the arm 1 and the sheave 4 of the lever 2. That is, when the bucket cylinder 7 is driven, the lever 2 whose one end is connected to the bucket cylinder 7 has a shaft 20 which is a pivotal support for the arm 1.
It rotates around the
Since the radius of rotation of the other end of the lever 2 to which the sheave 4 is attached is larger than the radius of rotation about the axis 20 at the connection point between the bucket cylinder 7 and the bucket cylinder 7, A large amount of movement is performed by the sheave 4 on the lever 2 side.
The interval between them also changes more than the driving amount of the cylinder 3. When the distance between the sheaves 4 and 4 changes, the lifting wire 3 is hung on the sheaves 4 and 4 multiple times.
It is several times the change in the distance between 4 and 4. Therefore, even when work is performed in a place where the height difference is large, the lifting wire 3 can move up and down at a high speed, so that the work can be performed quickly. Although the shovel bucket 6 also moves with the driving of the bucket cylinder 7, the movement of the shovel bucket 6 is hindered because the arm 1 is extended and the tip of the arm 1 is swung upward. It never happens. In addition, the knowledge block 9 hoisted by the hoisting device is
After being positioned above the place where the stones are piled up, the carrier 8
By operating each winch 9 in the above, the winch 9 is lowered to the piling position. When excavation work is performed instead of hoisting work, as shown in FIG. 5, the arm 1 is shortened and the connecting pin 24
It suffices to disconnect the lever 2 and the bucket cylinder 7 by means of, and further remove the carrier 8 from the lifting wire 3 to stop the tip of the lifting wire 3. Excavation work can be performed by driving the shovel bucket 6 as it is. In the figure, reference numeral 19 denotes a fixed seat provided at the tip of the fixed arm 11 in order to keep the connecting plate 23 out of the way. The embodiment shown in FIG. 6 does not include the extension / contraction drive mechanism 5 for extending / contracting the arm 1. In this case, the work of extending the arm 1 is performed by holding the arm 1 in a horizontal state once and then fixing the arm 11. Remove the pin 15 that secures the movable arm 12 to the movable arm 12, then turn the tip of the arm 1 downward,
Shorten the bucket cylinder 7. If both ends of the lifting wire 3 are fixed to the sheaves 4, 4, the movable arm 12 is extended by its own weight in accordance with the above movement of the bucket cylinder 7. Therefore, when the movable arm 12 is extended to a predetermined position, the pin 16 connects the fixed arm 11 and the movable arm 12. The work of retracting the arm 1 may be performed in the reverse order.

【The invention's effect】

As described above, in the present invention, when the bucket cylinder and the lever are connected, a slight movement of the lever is amplified by the lever and the sheave and transmitted to the lifting wire, and the arm is expandable and contractible. Since the distance between the sheaves can be long, a large amount of lifting and lowering can be easily obtained and the lifting and lowering can be done speedily, and a shovel bucket at the tip of the beam is not used. Since the arm is retractable, the lifting work and the excavation work using the bucket do not interfere with each other, and the effort required to switch between the two works is small, which is necessary for the construction of the retaining wall. The work can be done with high efficiency, and the hoisting work also uses the bucket cylinder for driving the shovel bucket. In order to carry out, without requires a separate cylinder for lifting work, it is those that can be provided at a low cost.

[Brief description of drawings]

1 is a side view of an embodiment of the present invention, FIG. 2 is a partial plan view of the same as above, FIG. 3 is a front view showing a winch portion of the same, and FIG.
(A) and (b) are explanatory views of the operation of the extension drive mechanism of the above, FIG. 5 is a side view of a state for excavation work of the same, FIG. 6 is a side view of another embodiment, and FIG. It is an exploded perspective view of an excavator, 1 is an arm, 2 is a lever, 3 is a lifting wire,
4 is a sheave, 5 is a beam, 6 is a shovel bucket, and 7 is a bucket cylinder.

Claims (1)

[Claims] 1. An expandable and retractable arm arranged on a beam at the tip of which a bucket of an excavator is mounted, rotatably connected to this arm, and one end of which is attached to and detached from a bucket cylinder for driving the bucket. A hoisting device, comprising a lever that is freely connected, and a hoisting wire laid between sheaves provided at the other end of the lever and the tip of the arm.