JPH0318598A - stacker crane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stacker crane that suspends a counterweight to reduce the load on a hoisting device for raising and lowering an elevating body.

Note that in the present invention, the rope includes a chain.

[Conventional technology]

As shown in Japanese Utility Model Application Publication No. 61-25397, a stacker crane consists of a traveling body, an elevating body provided to move up and down along the pillars of the traveling body, a transfer machine provided on the elevating body, and an elevating body. It consists of a hoisting device in which the lifting body is suspended from the top of the pillar via a rope in order to raise and lower the elevator.

The counterweight is suspended from the top of the column by a rope 6 fed out from a hoisting device. Wind up the rope to raise the elevator! When the rope is wound onto the hoisting drum at the ft position, the rope suspending the counterweight is let out from the hoisting drum, and the counterweight is lowered.

[Means to solve the problem]

If the rope breaks, the lifting body and counterweight will fall (
(free fall) and damage various parts, so safety devices are required.

For cutting ropes for lifting objects, an overspeed detection device is installed between the column and the lifting object, and when overspeed of descent is detected,
I try to grab onto the pillars to prevent myself from falling.

Further, a damper may be provided below the lifting area of the lifting body and the count weight. This is generally considered to be insufficient to prevent attacks when falling from a high place.

An object of the present invention is to provide a more reliable fall prevention means when a rope for a counterweight is cut.

[Means to solve the problem]

The present invention is characterized in that the lifting body and the counterweight are connected via a rope hung on a sheave installed above the lifting range of the lifting body.

[For production]

Under normal conditions, the distance from the elevating body to the counterweight via the upper sheave does not change, so even if a safety rope is installed to connect the two, the elevating body can be raised and lowered, and there is no need to worry about any problems. No.

If the rope suspending the lifting object or the rope suspending the counterweight breaks, for example, if the rope suspending the counterweight breaks, the counterweight will try to fall, but if you try to lift the lifting object through a safety rope, do. Therefore, high-speed fall (free fall) of the counterweight is prevented, and road loss of the traveling body can be prevented.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A stud crane according to an embodiment of the present invention will be explained below with reference to the drawings.

In FIG. 2, pillars 2, 2 are installed at the front and rear ends of the traveling body 1 in the traveling direction, respectively, and the upper parts are connected by a frame 3. Reference numeral 5 denotes an elevating body having a displacement *il6, which is guided by the pillar 2 and moves up and down.

Reference numeral 7 denotes a winding device for raising and lowering the elevating body 5.

The elevating body 5 is suspended from the upper frame 3 by a rope U fed out from a drum 7 m of a hoist [7].

Reference numeral 8 denotes a counterweight, which is provided so as to be guided by each column 2 and raised and lowered. counter weight 8
is suspended by a rope Δ fed out from a 7m drum. The rope 11 and the rope (3) are wound around the drum 7a in opposite directions so that when the rope U is wound around the drum 7a, the drum is unwound. Rope 11 is attached to the upper frame 3
．． A sheave is installed to hang 21.

The arrangement of the ropes will be explained with reference to FIG.

The rope U that suspends the elevating body 5 will be explained in detail.

There are two ropes U, each end of which suspends the elevating body 5.

One rope U let out from the drum 7a is a sheep 12
It is fixed to the upper frame 3 via the sheave 13, the sheave 14, and the sheave 15 at one end of the elevating body 5 in this order. The other rope U is connected to the upper frame 3 via the sheave 12b, the sheave 16, and the sheave 15b at the other end of the elevating body 5.
is fixed.

The rope mower that suspends the counterweights 8, 8 will be explained. There are two ropes Δ, each of which suspends the counterweights 8, 8.

The rope mower is attached to the drum 7 in the opposite direction to the rope U (for example, when the rope 11 is wound on the drum, the rope mower is paid out).
It is wrapped around a. One rope mower is fixed to the upper frame 3 via a sheave 22a, a sheave phantom, and a sheave 24b of one counterweight 8 in this order. The other rope a is fixed to the upper frame 3 via the sheave 22b and the sheave 24m of the other counterweight 8 in this order.

One end of the elevating body 5 and the counterweight 8 in its vicinity are connected via a sheave 32a installed on the upper frame 3 with a rope 31a. The other end of the elevating body 5 and the counterweight 8 in its vicinity are connected by a rope phantom a via a sheave 32b installed on the upper frame 3.

These ropes 31a, 3lb are normally installed so that no large tension is applied to them. The ropes 31a, 3lb are provided with covers or the like to prevent them from coming off the sheaves 32a, 32b.

Sheave 12a, 12b, 14, 22a, 22b, 32
a is installed on one end side of the upper frame 3. The sheaves 16, 73, and 32b are installed at the other end of the upper frame 3. The sheave 13 is installed approximately in the middle of the upper frame 3.

In such a structure, when the hoisting device 7 is operated to pick up the rope U, the elevating body 5 rises and the counterweight 8.8 descends. If the hoisting device 7 is reversed, the operation will be reversed. At this time, the ropes 31a, 3lb are connected to the sheave 32a.
, 32b.

The case where the rope breaks will be explained. Now, if the rope Δ suspending the leftmost counterweight 8 in the Nl diagram is cut, the counterweight 8 will try to fall freely. However, this counterweight 8 is attached to the rope 3l b
Since the counterweight 8 is connected to the left end of the elevating body 5 via the counterweight 8, the counterweight 8 cannot freely fall. Therefore, damage caused by free falling of the counterweight 8 can be prevented.

Furthermore, conventionally, the balance of the hoist I7 would be lost at this time, but this does not occur.

The same applies when the rope U for the elevating body 5 breaks. Therefore, a fall prevention device provided between the elevating body 5 and the pillar 2 can be made unnecessary.

The safety ropes 31a and 3lb are normally attached so that no tension is applied to them.

Therefore, its installation is extremely easy, and additional installation to an installed stacker crane or the like is possible. In addition, since tension is not always acting, the rope safety factor does not need to be so high, and a relatively thin rope can be expected to be sufficiently effective.

Note that a chain can be used instead of a rope.

〔Effect of the invention〕

As described above, according to the present invention, even if the counterweight or the rope for suspending the lifting body breaks, it is possible to prevent them from falling freely with a simple structure.

[Brief explanation of the drawing]

FIG. 2 is a rope layout diagram of a stacker crane according to an embodiment of the present invention, and FIG. 2 is a front view of the stacker crane according to an embodiment of the present invention. l... Running body, 2... Pillar, 5...
... Lifting body, 7... Hoisting device, 8... Counterweight, 11. 21・・・・・・n----, 4 ascending FIF fiog

Claims (1)

[Claims] 1. The lifting body and the counterweight, which are installed along the column of the traveling body so that they can be raised and lowered, are connected to the hoisting device via ropes, and when one rope is let out from the hoisting device, the other rope is A stack crane characterized in that the lifting body and the counterweight are connected via a rope that is wound around a sheave installed above the lifting range of the lifting body.