JP2002371584A - Self-weight variable bucket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the lowering of a grasping efficiency due to a variation in ground by use of weights, simplify weight mounting and replacement operations for self-weight adjustment, and suppress the lowering of a working efficiency due to the self-weight adjustment. SOLUTION: A weight receiving part 9 is provided on the bucket 1 suspended from a crane and grasping and scooping up sediment and rock. The weights 8 with high specific gravity for varying the self-weight of the bucket 1 are detachably fitted to the weight receiving part 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket suspended by a crane in a dredging operation or the like to grab earth and rocks and scoop it up, and in particular, to adjust an own weight of the bucket by attaching an arbitrary weight to the bucket. The present invention relates to a variable-weight bucket that can be used.

[0002]

2. Description of the Related Art Conventionally, for example, in a dredging operation, a bucket suspended by a crane is lowered to the sea floor or the water floor,
By using the bucket's own weight to make the bucket opened to the left and right bite into the seabed or the bottom of the water bottom, close the bucket when lifting the bucket and grab earth and sand and rocks,
A large amount of earth and sand and rocks are scooped up in a bucket at once.
By the way, the ability of the crane to lift the bucket used in the dredging work is determined by the total weight of the bucket's own weight and the weight of the earth, sand and rocks that the bucket scoops.
When the ground is soft and a large amount of earth and sand or rocks are to be gripped, the weight of the bucket must be reduced to increase the gripping volume. When the ground is hard and the soil and sand or rocks must be reduced, the weight of the bucket must be increased. For this reason, buckets generally include a light type bucket and a heavy type bucket. The light type bucket is a bucket having a large capacity for grasping earth and sand and rocks and having a light weight, and the heavy type bucket is a bucket having a small capacity for grasping earth and sand and rocks and having a heavy weight. In the dredging work, a light type bucket and a heavy type bucket are selectively used depending on the nature of the ground at the sea bottom or the water bottom. That is, the light type bucket is used when the ground is soft. When the ground is soft, it is used because the bucket can easily penetrate deep into the ground even if the weight of the bucket is light. On the other hand, the heavy type bucket is used when the ground is hard. This is because when the ground is hard, the bucket cannot easily penetrate deep into the ground unless the weight of the bucket is heavy. And, in order to carry out the dredging work efficiently within the capacity limit of the crane, the light type bucket and the heavy type bucket are mainly prepared in the dredging work, and the light type bucket and the heavy type bucket are prepared depending on the condition of the ground. They are used properly.

[0003]

However, in the dredging operation, it is costly to prepare a plurality of buckets for adjusting the weight of the bucket, and the work of exchanging the bucket suspended from the crane requires replacing the bucket. Since the opening and closing wire ropes to be opened and closed are wound around many times, it is troublesome and time-consuming and troublesome, and also causes a reduction in work efficiency.

The present invention has been made in view of the above problems, and has been made in order to solve the problems. An object of the present invention is to reduce the gripping efficiency due to a change in the ground by using weights. It is an object of the present invention to provide a variable-weight bucket that can reduce the weight, and can easily attach and replace weights for adjusting its own weight, and can reduce a decrease in work efficiency due to its own weight adjustment.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a weight receiving portion provided on a bucket suspended by a crane to grasp and scoop up earth and sand or rock, and the bucket is provided on the weight receiving portion. And a means for detachably attaching a weight having a large specific gravity for changing its own weight.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments of the invention shown in the drawings. Here, FIG. 1 is a front view of the bucket, FIG. 2 is a side view of the bucket, FIG. 3 is a partial front view of the weight attaching portion, FIG. 4 is a partial side view of the weight attaching portion, and FIG. It is a partial expanded sectional view of a part.

In the figure, a bucket 1 is used, for example, in a dredging operation or the like, to grab earth and sand or rocks while breaking the ground on the seabed or water bottom, or to grip a large amount of earth and sand broken by other equipment. The bucket 1 is suspended via a hanging tool 1a at the lower end of a support wire rope 2 hanging from the tip of a crane on a work boat (not shown).

The bucket 1 is provided with an upper block 3 on its upper part. The upper block 3 is shaped like a pentagon upside down and extended horizontally in the left and right directions.
The lower end of the support wire rope 2 is connected to the center of the upper end of the upper block 3. At the upper end of the upper block 3, a rope guide roller 3b for guiding one end of an opening / closing wire rope 4 described later downward is provided.

The upper ends of the arms 5, 5 are rotatably connected to the left and right ends of the upper block 3 by upper arm pins 5a, 5a. Each arm 5 is connected in an obliquely downward state such that it opens on both sides. In a space surrounded between the upper block 3 and the left and right arms 5 and 5, a lower block 6 and a shell 7 are provided vertically.

A rotatable lower sheave 6a is attached to the lower block 6. The upper block 3 is also provided with a rotatable upper sheave 3a. Between the upper sheave 3a of the upper block 3 and the lower sheave 6a of the lower block 6 located below, one end of the opening / closing wire rope 4 for opening and closing the shell 7 is wound back and forth many times. Have been.

As described above, the one end of the opening / closing wire rope 4 is reciprocated and wound between the upper sheave 3a of the upper block 3 and the lower sheave 6a of the upper lower block 6 many times. And the upper lower block 6 can be a booster mechanism, and the opening and closing wire rope 4 can be operated with a small force to open and close the shell 7.

The opening / closing wire rope 4 is used to open / close the shell 7 as described above. One end of the opening / closing wire rope 4 has an upper sheave 3a and a lower sheave 6a.
After being wound back and forth many times, the end is fixed to the upper block 3 or the lower block 6. The other end of the opening / closing wire rope 4 extends upward through the rope guide roller 3b of the upper block 3,
It is connected to the work boat via a crane not shown.

A lower central portion of the lower block 6 is connected to an upper central portion of a shell 7 so as to be openable and closable. That is, the shell 7 is composed of two members on the left and right, and the upper central part of the shell 7 divided on the left and right is connected to the lower block 6 so as to be rotatable left and right by the main shafts 7a, 7a. The left and right ends of the left and right shells 7 are provided at the lower ends of the arms 5 and 5 provided on the left and right, respectively.
b and 5b are connected rotatably.

The shell 7 opens and closes downward and to the left and right to grab earth and sand, rocks, and the like, and when the weight of the bucket 1 is heavy, the weight of the bucket 1 can be used to break the ground on the seabed or water bottom. A tooth 7b that bites into the ground is formed at the tip of the shell 7 that opens left and right. The shell 7 moves up and down and opens and closes integrally with the lower block 6 which moves up and down by the opening and closing wire rope 4. That is, when the lower block 6 moves down, the shell 7 opens, and when the lower block 6 moves up, the shell 7 closes.

A weight 8 for changing the weight of the bucket 1 is detachably attached to the bucket 1. In this embodiment, the weight 8 is connected to both shells 7,7.
It is attached to the upper side. Therefore, weight receiving portions 9 for attaching and fixing the weights 8 are formed on upper side surfaces of the two shells 7 to which the weights 8 are attached.

The weight 8 is made of a material having a large specific gravity, for example, the same material as the bucket 1 is used. Since the weight 8 receives buoyancy in seawater, a material having a specific gravity larger than that of seawater is used. It is desirable to use a weight 8 having a very large specific gravity in order to minimize the decrease in weight due to buoyancy in seawater.

In this embodiment, the weight 8 has, for example, a cylindrical shape, and is mounted between the lower arm pins 5b, 5b on the upper side surfaces of the shells 7, 7, so that the weight 8 has an outer periphery. On the lower side surface, a pair of mounting guides 8a, 8a for mounting on the cross beams on the upper side surface of the shell 7 are formed so as to protrude at intervals in the length direction. Further, a suspending piece 8b for suspending the weight 8 is fixedly provided on the outer peripheral upper side surface opposite to the mounting guide 8a.

At both ends of the cylindrical weight 8, for example, circular fixed guide plates 8c, 8c are fixedly provided. The diameter of the fixed guide plate 8c is larger than the diameter of the weight 8, and a plurality of mounting holes 8d are formed at regular intervals in a portion protruding from the outer periphery of the weight 8.

The weight receiving portion 9 for mounting and fixing the weight 8 is composed of, for example, a pair of fixed receiving guide plates 9a, 9a fixed inside the lower arm pins 5b, 5b. A pair of fixed receiving guide plates 9a, 9a
The weight 8 is mounted and fixed in between.

Each of the fixed receiving guide plates 9a, 9a has the same shape as the fixed guide plate 8c, and the mounting receiving holes 9b, 9b, 9b are provided at the same positions corresponding to the mounting holes 8d on the peripheral side of the fixed receiving guide plates 9a, 9a. 9b are respectively formed. The bolts 8 are screwed into these mounting holes 8d and the mounting receiving holes 9b and tightened, so that the weight 8 is
Fixed to

Next, the operation based on the configuration of the above embodiment of the present invention will be described below. When the bucket 1 is selectively used for the heavy type and the light type, the bucket 1 is pulled up on a work boat (not shown). The lifting is performed by winding up the support wire rope 2.

A plurality of weights 8 having different weights are prepared on the work boat.

Since the weights 8 are smaller and lighter than the exchange buckets, it is possible to prepare a large number of weights 8 having different weights, and to keep the space for storing the work boat without any problem. Can be adjusted, and a more optimal weight of the bucket 1 can be made within the range of the crane's capacity.

When it is desired to use the bucket 1 after lifting the bucket 1 on the work boat, a weight 8 having an optimum weight is selected and attached to the weight receiving portion 9 provided on the upper part of the shell 7 of the bucket 1. Fix it.

The corresponding optimum weight 8 is lifted using a crane (not shown). Lifting of weight 8
This is performed by suspending the wire rope suspended from the tip of the crane on the suspension piece 8b of the weight 8, and pulling up the wire rope.

After the lifted weight 8 is carried over the weight receiving portion 9 provided above the shell 7 of the bucket 1, the weight 8 is moved between the pair of fixed receiving guide plates 9a, 9a constituting the weight receiving portion 9. And lower the weight 8. At this time, the pair of mounting guides 8a, 8a formed on the lower side surface of the outer periphery of the weight 8 are lowered so as to be mounted on the upper cross beam of the shell 7.

After attaching the weight 8 to the weight receiving portion 9 in this manner, the weight 8 is inserted into the mounting receiving holes 9b of the fixed receiving guide plates 9a, 9a of the weight receiving portion 9 and the mounting holes 8d of the fixed guide plate 8c of the weight 8. The weight 8 can be firmly fixed to the weight receiving portion 9 by screwing and tightening the bolt. Thus, the weight of the bucket 1 can be easily changed to an arbitrary weight.

The present invention is not limited to the above embodiments of the present invention, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the bucket is used for the dredging work. However, the present invention is not limited to this, and it is needless to say that the bucket can be used for land-based excavation work. Further, the case where the weight 8 is attached to the shell 7 has been described. However, the present invention is not limited to this, and the weight 8 can be attached to a portion other than the shell 7. Furthermore, although the case where the weights 8 are attached to the shells 7 on both sides has been described, the weights 8 may be attached to only the shells 7 on one side. Furthermore, it goes without saying that three or more weights 8 may be attached to the bucket 1.

[0029]

As is apparent from the above description, according to the variable-weight bucket according to the present invention, a weight receiving portion is provided on a bucket suspended by a crane to pick up and scoop up earth and sand or rock. The weight of the bucket, which can change the weight of the bucket, is detachably attached to the receiving part. The weight of the bucket can be adjusted arbitrarily by attaching the weight to the bucket at the work site. It is possible to obtain the optimum weight of the bucket within the range.

As described above, the weight for adjusting the weight of the bucket can be significantly reduced by using the weight which is much lower in cost than the use of the light type bucket and the heavy type bucket. In addition, the work of attaching and replacing the weight for adjusting the own weight can be easily performed as compared with the work of exchanging the bucket, and a decrease in work efficiency due to the work of adjusting the own weight of the bucket can be reduced. It is effective.

[Brief description of the drawings]

FIG. 1 is a front view of a bucket showing an embodiment of the present invention.

FIG. 2 is a side view of the bucket showing the embodiment of the present invention.

FIG. 3 is a partial front view of a weight attachment portion showing the embodiment of the present invention.

FIG. 4 is a partial side view of a weight attachment portion showing the embodiment of the present invention.

FIG. 5 is a partially enlarged sectional view of a portion “A” in FIG. 3 showing the embodiment of the present invention.

FIG. 6 is a front view of a conventional bucket.

FIG. 7 is a side view of a conventional bucket.

[Explanation of symbols]

 Reference Signs List 1 bucket 1a hanging tool 2 supporting wire rope 3 upper block 3a upper sheave 3b rope guide roller 4 opening and closing wire rope 5 arm 5a upper arm pin 5b lower arm pin 6 lower block 6a lower sheave 7 shell 7a main shaft 7b tooth 8 weight 8b mounting guide Hanging piece 8c Fixed guide plate 8d Mounting hole 9 Weight receiving portion 9a Fixed receiving guide plate 9b Mounting receiving hole

Claims (1)

[Claims] 1. A weight receiving portion is provided on a bucket suspended by a crane to grasp and scoop up earth and sand or rocks, and a weight having a large specific gravity for changing the weight of the bucket is detachably attached to the weight receiving portion. Variable weight type bucket characterized by the following.