JPH04298496A - Hoisting device - Google Patents

Abstract

PURPOSE:To reduce weight of an upper frame and enable downsizing in a crane used in an automated warehouse. CONSTITUTION:An ascending/descending body 6 is connected to one edges of chains 9 spanned with sprockets 10, 11 and 12 arranged in the upper parts of posts 2, and a rope 14 is connected to the other edges. The rope 14 is connected to a drum 13 driven by means of a motor. The drum 13 is arranged in a position so as not to come into contact with a connecting unit 15 to connect the rope 14 and the chains 9 together. Since diameter of the sprockets 10, 11 and 12 to support the chains 9 can be made small, height of the upper parts of the posts 2 can be made small, so that weight reduction can be realized as compared with a device whose overall length is constituted only of the chains 9.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to hoisting devices for lifting bodies in cranes used in automated warehouses, etc.

0002

2. Description of the Related Art The structure of conventional hoisting devices depends on whether the lifting body is hung by a rope or by a chain. (JP-A-1-110408, JP-A-2-1826)
No. 04) A device using a rope can move the elevating body up and down by rotating a drum and winding up the rope. Generally, the drum is placed below the frame, and the sheave is attached to the top to guide the rope.

[0003] A device using a chain can raise and lower an elevating body by stretching the chain endlessly, setting a driving sprocket at a certain position, and applying drive to the sprocket.

0004

Two types of conventional hoisting devices each have their disadvantages.

[0005] In the rope type, the direction of movement is changed with a sheave and the rope is wound up with a drum, so the life of the rope will be shortened unless the diameter of the sheave or drum and the diameter of the rope are larger than a certain value. There were drawbacks, such as the need to use larger sheaves and drum diameters.

[0006] Generally, the ratio of the rope diameter to the sheave diameter is 2.
It is 0 times to 31.5 times. A rope sheave with a breaking strength of 6.7 tons and a rope diameter of 10 mm has a diameter of 200 mm.
It will be 315mm.

[0007] For this reason, if this rope type was adopted for a stacker crane in an automated warehouse, the height of the stacker crane would be increased.

On the other hand, in the case of the chain type, the sprocket diameter is 91 mm, which is nearly half the diameter of the sheave. Therefore, the height of the stacker crane can be reduced.

[0009] However, in the chain type, since the chain is endless, the length used becomes long and the weight increases. Furthermore, a chain tensioner is required to prevent the chain from slackening, which increases the number of parts.

[0010] An object of the present invention is to provide a hoisting device whose frame size can be made compact while keeping the mechanism simple.

[0011]

[Means for Solving the Problems] The present invention is characterized in that a chain and a rope are connected and used, and one end of the chain hung on a sprocket installed at the top is connected to an elevating body, and the other end of the chain is connected to a lifting body. is connected to a rope, the rope is connected to a drum driven by a motor,
It is characterized in that the connecting portion between the chain and the rope is provided so as to be movable from the upper part to the lower part of the ascending and descending range of the elevating body.

0012

[Operation] When the drum is driven and the rope is wound up, the chain is pulled and the elevating body rises.

As mentioned above, since the diameter of the sprocket is small, the height can be reduced.

[0014]

EXAMPLE An example of the present invention will be explained with reference to FIGS. 1 to 4. The automated warehouse crane consists of frames called a lower frame 1, posts 2, and an upper frame 3. The crane runs on a lower running rail 4 and is guided by an upper guide rail 5. The crane travels on the rails 4 by a traveling device 31.

The hanging device is called a lifting body 6. A fork 7 for transferring a load is attached to the elevating body 6. The elevating body can be moved along the post 2 by guide rollers 8.

A chain 9 suspends the elevating body 6. Sprockets 10, 11, and 12 are attached to the upper frame 3. The drum 13 with a drive motor is
The rope 14 can be wound up. The drum 13 is installed on the lower frame 1. chain 9 and rope 1
4 are connected by metal fittings 15. By winding the rope 14 around the drum 13, the elevating body 6 suspended by the chain 9 can be raised.

FIG. 1 shows a state in which the elevating member 6 is lowered to the lowest position, and FIG. 2 shows a state in which the elevating member 6 is raised to the uppermost position. As is clear from this, the position of the metal fitting 15 that connects the chain 9 and the rope 14 is such that it moves up and down along the post 2 and does not come into contact with the sprocket 12 and the drum 13.

According to this configuration, the members for suspending the elevating body 6 from above include the chain 9 and the sprockets 10, 11,
12, the diameters of the sprockets 10, 11, and 12 can be made small. Therefore, the height of the stacker crane can be reduced by this reduction. That is,
The height distance L3 from the highest elevating body to the highest member of the stacker crane can be reduced.

Note that the amount of elevation (L1) of the elevating body is determined by the amount of elevation (L1) of the elevating body
Since the amount of movement (L2) is smaller than the amount of movement (L2), the connecting fitting 15 between the rope 14 and the chain 9 does not hit the sprocket 12.

If the drum 13 is to be installed on the post 9, the rope 14 may be reversed using a sheave installed at the position of the drum in FIG. 1, for example.

[0021]

[Effects of the Invention] An advantage of the present invention is that a sprocket with small dimensions can be used, so that the upper frame can be made more compact.

[0022] If the upper frame can be made smaller, the weight can be reduced, and furthermore, the uppermost position of the elevating body can be raised, and the overall height can be reduced.

[0023] It has a rectangular frame structure with a high top.
The upper part is vibrating due to the shock when the crane stops. If the upper part is heavy, this vibration will increase, so if the upper frame is made lighter, it is possible to create a crane with less vibration.

Furthermore, since the drive device uses a drum type with a simple structure, it can be made at low cost.

[Brief explanation of the drawing]

FIG. 1 is a front view of a crane according to an embodiment of the present invention.

FIG. 2 is a front view of a crane according to an embodiment of the present invention.

FIG. 3 is an enlarged front view of essential parts of an embodiment of the present invention.

FIG. 4 is a layout diagram of chains and ropes according to an embodiment of the present invention.

[Explanation of symbols]

9...Chain, 10...Sprocket, 13...Drum, 1
4...rope, 15...metal fittings.

Claims (1)

[Claims] Claim 1: One end of the chain hung on the sprocket installed above is connected to an elevating body on which a load is placed, and the other end is connected to a rope, and the rope is connected to a drum driven by a motor. The hoisting device is characterized in that the connecting portion between the chain and the rope is movable from an upper part to a lower part of the ascending and descending range of the elevating body.