JPS6011900Y2 - Hanging beam steady rest device - Google Patents

Description

[Detailed description of the invention] This invention relates to a hanging beam steadying device for cranes used for cargo handling and transportation operations such as containers, and in particular to a hanging beam steadying device with an improved means for expanding the space between a pair of rope sheaves to prevent load swinging. .

The present applicant has previously provided this type of device, a suspended beam steadying device having the configuration shown in FIG. Rope sheep 3 supported and pivoted at their lower ends,
The hoisting sheave 6.6 of the spreader 5 is suspended from the hoisting sheave 6.6 of the spreader 5 via the hoisting rope 4.4, and the pendulum levers 2, 2 are operated to expand and contract in relative directions by a pair of horizontal hydraulic cylinders 7.7. .

The cargo is handled and transported by moving the trolley 1 sideways with the load 8 suspended by the spreader 5. In this case, if the distance between the rope sheeps 3 and 3 is narrow, the load will swing. In order to prevent this, by stretching the hydraulic cylinder 7.7, the rope sheep 3,
3 rooms are being expanded.

However, a large force that draws each other together due to the suspended load acts on these rope sheaves 3, 3, and this acting force becomes stronger as the sheave spacing becomes wider, so a considerable amount of power is required when widening the sheave spacing. The hydraulic cylinder 7.7, which requires a Problems arose, such as increased equipment costs due to the large-scale construction.

This invention was made to solve the above problems, and its purpose was to expand a pair of rope sheeps, which are subjected to a large acting force in the direction of mutual attraction under a suspended load, using an automatic mechanical screw feeding means to prevent the load from swinging. By doing so, it is possible to reduce the driving energy at the time of expansion, and it is possible to smoothly and easily expand the space between the rope sheeps with a small amount of power, and it is also possible to simplify the configuration and reduce costs. To provide a hanging beam steady rest device.

A preferred embodiment of this invention will be described below with reference to FIGS. 2 to 4.

In FIG. 2, a trolley body 11 is suspended from a crane track girder 10 via upper trolley wheels 12,13.

The trolley main body 11 has link mechanisms 14 and 15 for holding sheaves provided on both sides thereof.

Each link mechanism 14.15 includes a pair of pendulum levers 16.17 whose upper ends are pivoted at laterally spaced positions on both sides of the trolley main body 11, and a pair of pendulum levers 16.17 with pivots 18.19 at their lower ends. It has a pair of drive levers 20, 21 whose lower ends are rotatably connected, and the upper ends of these drive levers 20, 21 are connected to symmetrical positions on both sides of the screw feed piece 25 by pivots 22, 23, forming a substantially W-shape. The structure is as follows.

In the link mechanism 14.15 having the above configuration, the lower pivot 1
Rope sheeps 27, 28 are rotatably attached to 8.19, and a spreader (suspension) is attached to these rope sheeps 27, 28 via a hoisting rope 29 that is hoisted and rewound by a hoisting device (not shown). hoisting sheave 31 on beam) 30,
32 is a suspension.

On the other hand, the screw feeding piece 25 is made of an internal threaded loop such as a nut, and is a vertical screw rotatably attached to the central part of both sides of the trolley main body 11 via a bearing 26 between rope sheeps 27 and 28. It is screwed onto the rod 24.

This screw rod 24 is driven to rotate in forward and reverse directions by power, and an example of the driving means will be described below with reference to FIG. 4.

That is, a double-shaft type motor 33 that can freely rotate in forward and reverse directions as shown in the figure is mounted in the center of the trolley body 11 in FIGS. 2 and 3, and both rotating shafts 33a, 33
The motor 33 is configured to rotate the screw rod 24 by meshing the bevel gears 34 fitted to each end side of the trolley b with the bevel gears 35 fitted to the screw rods 24 on both sides of the trolley main body 11. Bye.

In this case, since the screw rods 24, 24 on both sides of the trolley main body 11 are rotated simultaneously in the same direction and at the same speed by the motor 33, both the screw rods 24, 24 are rotated by the respective screw rods 24, 24. 7
The directions are reversed so that the individual screw feed pieces 25 move up and down in the same direction at the same time.

Note that such driving means for the screw rod 24 may be other automatic mechanical means.

Next, the operation of the above embodiment will be explained.

First, as shown in FIG. 2, when the screw feed piece 25 of the screw rod 24 is in the raised position, the rope sheep 27.
8 is pulled closest, the hoisting device unwinds the hoisting rope 29 to lower the spreader 30 to a predetermined position.

Next, after a suspended load W such as a container is suspended by the pre-ladder 30, the hoisted load W is hoisted to a predetermined height by winding up the hoisting rope 29.

Therefore, when the motor 33 in FIG. 4 is started to rotate in one direction, the rotational force is transmitted to the screw rods 24 on both sides of the trolley main body 11 via the bevel gears 34 and 35.
Therefore, each screw rod 24 has an individual screw feed piece 25.
Rotate in the same direction and at the same speed to lower the

Therefore, each screw feed piece 25 descends from the solid line position to the dashed line position in FIG.
4.degree. 15 expands laterally using the upper end shaft support of the pendulum lever 16.17 as a fulcrum and is displaced to the maximum expansion position shown by the dashed line in FIG.

By the required expansion operation of the link mechanisms 14 and 15, the space between the rope sheeps 27 and 28 is widened, and swinging of the suspended load W when the trolley travels is prevented.

During the above operation, as the degree of expansion of the rope sheeps 27 and 28 increases, the force that draws the pendulum levers 16 and 17 inward increases; however, the downward speed of the screw feed piece 25 remains constant. , due to the link mechanism between the drive lever 20.21 and the pendulum lever 16.17, the expansion speed of these rope sheeps 27, 28 is reduced, so that when the load is small it is fast and the load gradually increases. As a result, the link mechanisms 14 and 15 are driven to expand later, and there is almost no change in the output power of the motor 33, that is, the power source during the drive. 15 can be smoothly expanded and contracted.

In addition, in the above embodiment, the expanded rope sheep 2
7 and 28, the distance between them can of course be narrowed by starting the motor 33 to rotate in reverse.

In summary, the present invention provides the following excellent effects.

■ The vertical movement of the feed piece due to the rotation of the screw rod,
The link mechanism between the drive lever and the pendulum lever allows the rope sheep to expand and contract in the traverse direction of the trolley, so the entire device is compact, yet the rope sheep can be expanded widely to prevent load swing. .

■ In addition, due to the above link mechanism, when the lifting speed of the swing piece is constant, the expansion speed gradually decreases as the rope sheep expands, so the mutual pulling direction due to the hanging load as the rope sheep expands. The rope sheep can be expanded quickly when the load is small, and slowly when the load is large, allowing for economical use of power in response to changes in load.
The rope sheep can be expanded and contracted with a small amount of power.

■ The simple structure reduces the weight of the trolley.
This can contribute to improving the economy and performance of the crane as a whole.

[Brief explanation of drawings]

FIG. 1 is a side view of the previously provided hanging beam steady rest device, FIG. 2 is a side view of a hanging beam steady rest device according to a preferred embodiment of this invention, and FIG. 3 is a schematic perspective view of the same device. 4 is a front view showing an example of the device driving means, and FIG. 5 is an explanatory view of the operation of the device. In the figure, 10 is a girder, 11 is a trolley main body, 14 and 15 are link mechanisms, 24 is a screw rod, 25 is a screw feeding piece, 27 and 28 are rope sheeps, and 33 is a rotational drive means.

Claims (1)

[Scope of utility model registration request] Pendulum levers, one end of which is pivotally supported on a trolley that traverses on the girder of the crane, so as to be able to freely swing at intervals in the traverse direction, a rope sheep provided at the tip of each pendulum lever, and a tip of each pendulum lever. A drive lever, one end of which is pivotally supported on the trolley and the other end pivoted on a common screw feed piece, is rotatably installed on the trolley by screwing the screw feed piece together, and expands and contracts between the two rope sheeps. A hanging beam steadying device characterized by comprising a screw rod that moves a screw feed piece up and down to move the screw feed piece up and down.