JPH0362852B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a boom connection and separation device for a multi-purpose work boat that performs crane work, sometimes grab dredging work, etc. on water.

[Conventional technology]

A crane ship dedicated to crane work on the water.
Dredgers, etc. dedicated to grab dredging work are fully equipped with dedicated functions for each purpose.
A ship with a single purpose and a single function has the disadvantage that its operating rate as a work vessel is low. To solve this problem, multi-purpose work boats have been developed that can be used for a variety of tasks such as crane work and grab dredging work.

As this type of multi-purpose work boat, for example, the one shown in FIG. 5 has been known. this is,
This is a crane work vessel configured to be able to be used for grab dredging work. In the figure, 1 is a crane boom, 2 is a boom hoist line that adjusts the elevation angle of the crane boom, 3 is a cargo hoist line, 4 is a hanging hook, and 5 is a turntable that allows the crane to change direction. This crane work boat can be used as a grab dredging work boat by replacing the cargo hoist line 3 with a grab hoist line.

[Problem that the invention seeks to solve]

In such a multi-purpose work vessel, the following problems occurred especially when switching from a crane work vessel to a grab dredging work vessel.

(1) During crane work, it is necessary to make the crane boom 1 as long as possible in order to increase the lifting height and outreach of the lifting hook 4. Furthermore, for work safety, the lifting and lowering of the lifting hook 4 and the turning speed of the boom 1 must be appropriately restricted.

(2) Contrary to the above-mentioned crane work, in grab dredging work, it is not desirable for the length of the boom to exceed a certain length; It is necessary for work efficiency to make the turn as quickly as possible, and the number of repetitions is far greater than in crane work.

(3) Using a long boom used for crane work as is for grab dredging work is a waste of power energy, and moving a long crane boom at high speed increases the strength of the boom and auxiliary equipment. Not only is it necessary;
It is dangerous.

(4) As a way to avoid such disadvantages,
When switching from crane work to grab dredging work, it is necessary to shorten the boom length, but for this purpose, the structure of the boom 1 body can be separated and connected, and the boom hoist line 2, cargo hoist line 3, etc. It will be necessary to replace the moorings. During this mooring changeover work, the boom hoist line 2 has to wind around a large amount of pulleys and guide wheels.
This required a lot of labor and time and was inappropriate for shipboard work. For this reason, it has been difficult to convert the above-mentioned crane work vessel to a grab dredger.

[Means for solving problems]

The present invention has been made to solve these problems, and includes a joint part that can be separated and connected to the boom of a crane for both hook and grab operations, and a line wire is attached to the tip of the boom hoist line. A connection switching fitting is provided which is wound around and removably locked to a locking means provided on the boom below the joint, and furthermore, one end is rotatably fixed to a shaft at the tip of the boom and the other end is fixed to the boom. A boom connection and separation device is provided in which a connection means capable of being pivoted is provided at one end of a connection switching fitting.

[Effect]

During a hoist operation, after the joints of the boom are connected, the connection switching fitting and the connection means are connected to form a boom hoist line, thereby operating as a long crane boom.

During grab operations, by separating the joints of the boom and then separating the connection switching fittings and the connection means, a short boom hoist line can be formed and the boom can be operated as a short boom.

〔Example〕

FIG. 1 is a side view schematically showing the overall configuration of an embodiment of the present invention. In the figure, a joint by a joining hardware 6 is provided approximately in the center of the boom 1,
The boom 1 can be separated into a lower boom 1a and an upper boom 1b. FIG. 3 is a detailed view of the joint. As shown in the figure, the lower boom 1a and the upper boom 1b are tightened by metal fittings 6 and bolts 6a, and are detachable. Lower boom 1
A padded eye 7 is fixed to the upper part of the tip of a.
A connection switching fitting 8 is pivotally fixed to this padded eye 7.

FIG. 2A is a detailed view of an embodiment of the connection switching fitting 8. As shown in the figure, the top plate is made of flat steel with L-shaped side plates on both sides, and the two sides are connected to form a box shape. One end 8b is pivoted to the pad eye 7 provided on the lower boom 1a, and the other end 8c is pivoted to the tip of the upper boom 1b. The other end of the boom hoist rod 10 connecting means can be fitted and detachably fixed to the shaft. As shown in another embodiment of FIG. 2B, the sheave block 9 and the connection switching hardware 8 are connected by locking the sheave around which the boom hoist line 2 is wound around the central portion 8a of the side plate of the connection switching hardware 8.
If these are integrated, it will be lighter and easier to handle. Referring again to FIG. 1, 11 is a grab bucket, 12 is a grab hoist line for operating the grab bucket 11, and 13 is an A-shaped frame for locking the boom 1, which is installed on the turntable 5.

Next, this effect will be explained. FIGS. 4A to 4C are schematic diagrams illustrating this effect. The method of switching from crane work to grab work on a multi-purpose ship according to the present invention is as follows: First, after completing the crane work, turn the turntable 5 and turn the A-frame 13;
Thereafter, the boom hoist line 2 is extended to bring the boom 1 closer to the boom rest 14 installed on the deck of the ship (Fig. 4A).

Next, after placing the upper boom 1b of the boom 1 on the boom rest 14, one end 8b of the connection switching fitting 8 is placed.
is fixed to the pad eye 7 on the tip of the lower boom 1a, and then the boom hoist rod 10, which was fixed to the other end 8a of the connection switching fitting 8, is detached (FIG. 4B).

Next, by switching the cargo hoist line 3 to the grab hoist line 12 and hoisting the boom hoist line 2, the grab bucket 11 will be
It is suspended from the short lower boom 1a and can be used for grab dredging work (Fig. 4C).

When switching from grab dredging work to crane work, it can be easily done by performing the above procedure in reverse.

In this embodiment, a method for adjusting the length of the boom to accommodate both crane work and grab dredging work has been described. However, the present invention is not limited to this, and the method for adjusting the length of the boom is Needless to say, it can be applied to any case.

Furthermore, the boom hoist rod 10 is not limited to a rod; wire, flat steel, or other connecting materials with sufficient strength may be used.

〔Effect of the invention〕

According to the present invention, the field of application of multi-purpose ships has expanded by making it possible to easily extend and retract the boom, which has traditionally been a problem when multi-purpose ships perform crane work and grab dredging work on the water. This can greatly improve operating efficiency, safety, and energy savings.

[Brief explanation of drawings]

Fig. 1 is a side view of an embodiment of the present invention, Figs. 2A and B are perspective views of an embodiment of the connection switching fitting, and Fig. 3 is a schematic diagram showing the connection between the boom joint and the connection switching fitting. , FIGS. 4A to 4C are explanatory diagrams showing the operation of the present invention, and FIG. 5 is a side view of a conventional crane work boat. 1: Boom, 2: Boom hoist line, 3:
Cargo hoist line, 4: Cargo hoist, 5:
Turntable, 6: Joining hardware, 7: Padded eye, 8: Connection switching fitting, 9: Sheave block, 1
0: Boom hoist rod, 11: Grab bucket, 12: Grab hoist line, 13: A frame, 14: Boom rest.

Claims (1)

[Claims] 1 A locking means is provided on the boom of a crane that can be used for both hook and grab operations, and a line wire is wound around the tip of the boom hoist line, and the boom is provided below the joint. A connection switching fitting is provided that is detachably locked to the boom, and a connecting means is provided at the tip of the boom such that one end is rotatably fixed to the shaft and the other end is pivotable to one end of the connection switching fitting. Boom connection and separation device.