JPH0640521A - Lift base driving device for stacker crane - Google Patents

Abstract

PURPOSE:To prevent the generation of collision noises caused by the contact with a mast when a chain for lifting/lowering a lift base is swayed at the portion passing through the interior of the mast and the portion along the outer face of the mast in a stacker crane. CONSTITUTION:The diameter D of a wheel 9 provided at the upper section of a mast 3 is formed into the size to satisfy D>=(B/2+alpha) + (thickness of mast 3) + (b/2+beta), where (B/2) is the maximum amplitude of a chain 5 in the mast 3, (b/2) is the maximum amplitude of the chain 5 outside the mast 3, and alphaand beta are margins respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting platform driving device for a stacker crane provided in an automatic warehouse or the like.

[0002]

Conventional Stacker Cranes Conventionally, the following stacker cranes of this type are known. That is,
It is a stacker crane in which a hollow mast is erected on a traveling base, and an elevating platform is provided to be movable up and down along the mast. This stacker crane lifter drive device is a wire rope, chain, or other hoisting member that suspends the lifter, wound around a rotatable wheel provided on the upper part of the mast, and then passed through the inside of the mast. The structure is such that it is wound around a rotatable wheel provided in the lower part and is further connected to the lower part of the lifting table via a drive wheel attached to a motor or the like.

[0003]

Disadvantages of the Prior Art The conventional lifter drive device of a stacker crane has the following drawbacks. That is, when the suspension cord member is driven to move up and down the lifting platform, or when the stacker crane travels, this suspension cord member will sway inside and outside the mast, and the inner or outer surface of the mast will be swayed. It was bumping and making noise.

[0004]

[Means for Solving the Disadvantages] The present invention adopts the following means in order to eliminate the above disadvantages. That is, at least the wheel provided on the upper portion of the mast is formed to have a diameter capable of holding the distance from the inner surface and the outer surface of the mast to the hanging rope member exceeding the maximum amplitude of the hanging rope member. In this specification, the maximum amplitude refers to half of the total amount when the sling member vibrates most.

[0005]

The present invention has the following functions. The spacing between the sling members that pass through the interior of the mast and the inner surface of the mast, and the spacing between the sling members that pass through the outside of the mast and the outer surface of the mast are greater than the maximum amplitude when the sling members swing. Moreover, since it is held by the wheel, the suspension member does not collide with the inner surface or the outer surface of the mast.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings. As shown in FIG. 1, the stacker crane 1 includes a traveling base 2 that can travel along a rail 20 and two masts 3 that are erected on the traveling base 2 at a predetermined interval.
3 and an elevating table 4 provided so as to be able to move up and down between these masts 3, 3. Reference numeral 7 is a guide roller for lifting guides, 8 is an article transfer device such as a slide fork, and W is an article. The drive device for raising and lowering the lifting table 4 is configured such that the hanging members 5 and 6 (for example, chains) connected to suspend the lifting table 4 are mounted on the traveling base 2 by a motor 12 or the like. The structure is such that the feed drive in the ascending or descending direction is transmitted.

Of the masts 3 and 3, at least the motor 1
The one closer to 2 (the one arranged on the right side in the drawing) has a hollow shape, and the hanging rope members 5 and 6 are passed through the inside thereof. Of these hanging rope members 5 and 6, the lifting table 4
The suspension cord member 5 connected to the portion near the motor 12 in FIG. 1 is wound around a rotatable wheel 9 provided on the upper portion of the mast 3, and then passes through the inside of the mast 3 and is rotatable on the lower portion. Drive wheel 11 wound around a flexible wheel 10 and attached to the motor 12
It is adapted to be connected to the lower part of the lifting table 4 via.

As shown in FIG. 2, the wheel 9 above the mast 3
Is formed to have a diameter D satisfying the following two conditions. (Condition 1) When it is assumed that the sling member 5 is taut between the upper and lower wheels 9 and 10, the distance between the sling member 5 and the inner surface of the mast 3 is A (in the drawing, Since the member 5 is in a state of being slightly inclined from the vertical direction,
A) becomes larger than the maximum amplitude of the suspension rope member 5 (B / 2: B is the total amount of shaking). (Condition 2) When the lifting table 4 is lowered and positioned at the lowest position, and when it is assumed that the hanging member 5 is taut between the upper wheel 9 and the lifting table 4, the hanging member is 5 is the distance between the outer surface of the mast 3 and
However, it becomes larger than the maximum amplitude of the hanging rope member 5 (b / 2: b is the total amount of shaking). That is, the diameter D of the upper wheel 9 is D ≧ (B / 2 + α) + (thickness of the mast 3) +
It is formed in a size that satisfies (b / 2 + β). Here, α and β are respective allowances. In addition,
The lower wheel 10 also preferably has the same size as the upper wheel 9.

Sprocket is used for the upper and lower wheels 9 and 10 when the hanging rope member 5 is a chain,
When it is a wire rope, a V-groove pulley or the like is used. In addition, also in the hanging rope member 6 connected to the portion far from the motor 12 in the lifting table 4, it passes through the mast 3 between the above-mentioned upper and lower wheels 9 and 10 and the corresponding wheels (not shown). The wheels are formed in such a size that they satisfy the above-mentioned two conditions and are arranged in the same position as the wheels 9 and 10. . In addition, the suspension cord member 6 is attached to the other mast 3 (see FIG.
Regarding the wheel 15 used to follow the outer surface of the left side inside), each of the above wheels (9 etc.)
The same size as the above, and the distance between the sling member 6 and the outer surface of the mast 3 is maintained at the same dimension as the above-mentioned a, that is, a value of (b / 2 + β) or more, and the collision at this portion is prevented. I also try to prevent it. By the way, by doing such a thing, the ceiling surface and the suspension line member 6 come close to each other in the upper frame 13 that connects the upper ends of the masts 3 with each other. A guide member 16 as shown in FIGS. 3 and 4 is provided. This guide member 16
Prevents the sling member 6 from colliding with the ceiling surface of the upper frame 13, and when the sling member 6 is a chain, moves in the front-back direction (direction perpendicular to the paper surface of FIG. 1). The structure is provided with the hanging parts 17 and 17 for engagement so as to prevent shaking. It goes without saying that the sling members 5, 6 are displaced in the front-rear direction (direction perpendicular to the paper surface of FIG. 1). The device of the present invention can be applied to a stacker crane (not shown) having only one mast 3.

[0010]

Next, the operation of the embodiment apparatus will be described. When the motor 12 is activated to drive the suspension rope members 5 and 6 by the drive wheel 11 in order to raise or lower the lifting platform 4, or when the stacker crane 1 travels,
Even if the suspension cord members 5 and 6 sway inside and outside the mast 3, the suspension cord members 5 and 6 do not collide with the inner surface and the outer surface of the mast 3, and therefore noise is generated due to this. There is nothing to do.

[0011]

The present invention has the following effects due to the above-described structure. Since the sling member does not collide with the inner surface or the outer surface of the mast, and the generation of noise is prevented, the elevating platform is lifted and the stacker crane travels quietly.

[Brief description of drawings]

FIG. 1 is a side view showing a stacker crane.

FIG. 2 is a schematic cross-sectional view showing the relationship between a mast and a suspension cord member hung between the upper and lower wheels.

FIG. 3 is an enlarged sectional view of an arrow III portion in FIG.

4 is a sectional view taken along line IV-IV of FIG.

[Explanation of symbols]

 1 Stacker crane 2 Traveling base 3 Mast 4 Lifting platform 5 Suspension member 9 Upper wheel 10 Lower wheel

Claims (1)

[Claims] 1. An elevating table is provided to be movable up and down on a hollow mast of a traveling base, and a suspending member of the elevating table is wound around an upper wheel and then passed through the mast to a lower wheel. An elevating platform driving device for a stacker crane, wherein the wheel is wound around and has a diameter capable of holding a distance from an inner surface and an outer surface of a mast to a suspension member exceeding a maximum amplitude of the suspension member.