JPH0725412A - Stacker crane - Google Patents

Abstract

PURPOSE:To carry out storage and taking out of an article efficiently without any movement in the lateral direction by providing a moving platform, which can be freely moved in the lateral direction, and at least two article transfer devices on an elevating platform arranged in front of a rack device freely movably in the lateral direction. CONSTITUTION:A pair of upper and lower guide rails, whose longitudinal directions face the lateral direction, are arranged in a stacker crane passage, and a stacker crane is guided by these guide rails freely movably in the lateral direction. When a supporting column 7 for a shelf is present between right and left slide forks 23 while the stacker crane stops, there is no need to move a laterally moving platform 26. On the other hand, wen a structural supporting column 3 is present between the right and left forks 23 while the stacker crane stops, an article is transferred by the right side slide fork 23, and then, the laterally moving platform 26 is slightly shifted to the left side. In this constitution, two articles can be stored/taken out in/from an article storage shelf 10 quickly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacker crane for an automatic warehouse.

[0002]

2. Description of the Related Art The following are known as conventional automatic warehouses. That is, a pair of front and rear rack devices having a large number of article storage shelves vertically and horizontally provided at predetermined intervals in the front and rear direction, and a stacker crane movably provided between the front and rear rack devices. The stacker crane has a traveling carriage, an elevating stand that can be moved up and down by a mast provided on the traveling carriage, and an article transfer device (for example, a front-back direction) provided on the elevating stand. A slide fork slidably provided in the rack device, and the rack device includes a large number of front structural columns arranged side by side at predetermined intervals, and a predetermined number of space between the front structural columns behind the front structural columns. Rear structural columns lined up at intervals, structural beams passed to these left and right structural columns at predetermined intervals in the height direction, structural beams passed to the front and rear structural columns, and the front structural beams and Rear side Shelf columns that have a smaller cross-sectional shape (smaller left and right width) than the structural columns, and are passed to the beam at predetermined intervals in the left-right direction so that the front and rear ones face each other, and the left and right sides of the shelf columns. And an article supporting member attached at a predetermined interval in the height direction to the side of the structure column that faces the shelf column, and the left and right sides that face each other without the column (structural column and shelf column) interposed therebetween. 2. Description of the Related Art It is known that an article storage shelf is configured by an article support member. In the conventional rack device, the structure supporting the overall strength is constituted by the structure support pillars, the structure beams, and the structure crosspieces, and the support pillars for shelves are attached to the structure, so that the rack device is constructed. There are advantages such as ease of use.

[0003]

OBJECTS OF THE INVENTION In the conventional automatic warehouse, if two article transfer devices are installed side by side on an elevator,
By using the article transfer devices arranged side by side, the articles can be efficiently stored in and taken out from the article storage shelves. However, in the above rack device, since the structural columns and the column columns for shelves having a smaller cross-sectional shape (smaller left-right width) than the structural columns are arranged in the left-right direction, the left and right article storage shelves sandwiching the structural columns can be used. Since the length between the centers in the left-right direction and the length between the centers in the left-right direction of the left and right article storage shelves that sandwich the shelf column are different, the distance between the centers in the left-right direction of the article transfer device is set to any one of the above-mentioned lengths. Even if it is adjusted to the other, it does not match the length of the other, so when storing or taking out the articles from the two article storage shelves that have not been adjusted, the articles are stored into or taken out from one of the article storage shelves. After that, the heavy stacker crane needs to be moved to the left and right to store and remove the articles from the other article storage rack. It is an object of the present invention to efficiently store and take out articles without moving a heavy stacker crane to the left and right.

[0004]

In order to achieve the above object, the present invention employs the following means. According to the present invention, a left and right moving table is provided on a lifting table of a stacker crane that is provided on the front side of a rack device so as to be horizontally movable, and at least two article transfer devices are provided on the left and right moving table. It is a thing.

[0005]

The present invention has the following functions. Since at least two article transfer devices are provided on the left-right movable table provided on the lifting table so as to be movable left and right, the left and right parts of the article transfer device are aligned so that the center of the article transfer device in the left-right direction coincides with the center of the article storage rack in the left-right direction. By moving the moving table to the left or right, that is, without moving the heavy stacker crane to the left or right, all the article transfer devices can store and take out the articles.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings. In this specification, the front means the lower side of FIG. 1, the rear means the upper side of FIG. 1, the left means the left side of FIG. 1, and the right means the right side of FIG.

A pair of front and rear rack devices 1 are erected on the floor so as to open the stacker crane passage 16. The rack device 1 includes a large number of front structural columns 3 arranged on the left and right at predetermined intervals, and rear structural columns 3 arranged behind the front structural columns 3 with a predetermined space therebetween.
A structural beam 4 which is passed over the left and right structural columns 3 at predetermined intervals in the height direction, a structural beam 5 which is passed over the front and rear structural columns 3 at predetermined intervals in the height direction, and the front structural beam Shelf columns 7 having a smaller cross-sectional shape (smaller left-right width) than the structural columns 3 that are passed to the structural beams 4 on the rear side and the rear side at predetermined intervals in the left-right direction so that front and rear members face each other. , The article support members 9 mounted at predetermined intervals via mounting bars 8 on the left and right sides of the shelf column 7 and on the side of the structural column 3 facing the shelf column 7. And the left and right article support members 9 that face each other without the shelf column 3 interposed therebetween.
An article storage shelf 10 is constituted by a pair of left and right article support members 9, and a fork passage gap 11 that allows a slide fork 23, which will be described later, to move in the vertical direction is formed. The access ports 13 of the article storage shelves 10 of the front and rear rack devices 1 face each other. The length from the horizontal center of the shelf column 7 to the horizontal center of the article storage rack 10 is l, and the length from the horizontal center of the structural column 3 to the horizontal center of the article storage rack 10 is L. Has been done.

On the left side of the rack device 1, there is provided a loading / unloading roller conveyor 14 with the carrying direction directed to the left and right. A known article elevator (not shown) is provided on the rack device 1 side of the loading / unloading roller conveyor 14 so as to be paired with a slide fork 23 described later. This article lifter is a lift table that can be lifted and lowered by a known lift device below the rollers of the loading / unloading roller conveyor 14, and a pair of bearings that are installed upright on the lift table and located between the rollers of the loading / unloading roller conveyor 14. And a frame. The article elevator is configured such that the article W is lifted by the support frame to move the article loading / unloading roller conveyor 14
Forming a fork insertion gap between the conveying surface of the article W and the lower surface of the article W, or receiving the article W from the slide fork 23 by the support frame at the elevated position, and then descending the article W to the loading / unloading roller conveyor 14. It is the action of lowering.

A pair of upper and lower guide rails 18 are arranged in the stacker crane passage 16 so that the longitudinal direction thereof is oriented in the left-right direction, and the stacker crane 19 is guided by these guide rails 18 so as to be movable left and right. , The stacker crane 19 has a traveling carriage 20.
And a pair of masts 22 provided on the traveling carriage 20 so as to be able to move up and down, and a left and right moving base 26 provided on the lifting base 22 so as to be movable left and right by an operating device 31 described in detail below. And a pair of left and right slide forks 23 that are horizontally slidable in the front-rear direction by a well-known advance / retreat mechanism on the left / right moving table 26. The length between the left and right centers of the left and right slide forks 23 is 2
1 (the length between the left and right centers of the left and right article storage shelves 10 sandwiching the shelf support 7). The upper surfaces of the left and right slide forks 23 are flush or almost flush. As is well known, the slide fork 23 pulls the article W into the elevating table 22 by performing an operation of projecting the article W downward, lifting the article W by raising the elevating table 22 and retracting the article W to the elevating table 22 side. The article W can be unloaded onto the article storage rack 10 or the like by the reverse operation. Instead of the slide fork 23, another article transfer device may be used.

The actuating device 31 has a motor 32 mounted on the lifting table 22 and capable of rotating in the forward and reverse directions. A pinion 33 is fitted to the rotating shaft of the motor 32, and the pinion 33 is moved to the left and right moving table. Rack 34 provided on 26
Are in mesh. With such a configuration, the left and right moving table 26 can be moved to the left and right by rotating the pinion 33. In this embodiment, the left / right moving table 26
In the normal state, the stacker crane 19 is stopped so that the right-left center of the slide fork 23 is aligned with the left-right center of the article storage shelf 10 in that state. Has been done. Therefore, when the stacker crane 7 is stopped and the shelf columns 7 are provided between the left and right slide forks 23,
It is not necessary to move the left and right moving table 26. On the other hand, when the stacker crane 19 is stopped and the structural support pillar 3 is located between the left and right slide forks 23, after the article W is transferred by the right slide fork 23, the left and right moving base 26 is moved to the left ( Only L-1) will be moved. With such a configuration, the two articles W can be quickly stored in the article storage rack 10 or taken out from the article storage rack 10. Two sets of reflection type photoelectric switches 37, 38, 39, 40 are provided on the front and rear of the left and right moving table 26 in the order listed from the right. When the horizontal center of the right slide fork 23 is aligned with the horizontal center of the article storage shelf 10 on the left side of the structural support column 3, the reflective photoelectric switch 37 is made to face the structural support column 3, and the right slide When the left-right center of the fork 23 is aligned with the left-right center of the article storage shelf 10 of the shelf column 7, the reflection type photoelectric switch 40 is made to face the structural column 3, and the right-side direction of the right slide fork 23 is set. When the center is aligned with the left-right center of the article storage shelf 10 on the right side of the structure column 3, the reflective photoelectric switch 39 is made to face the structure column 3, and in that state, the left slide fork 2
The left and right center of 3 is the article storage shelf 10 on the left side of the structural support column 3.
When the left and right moving table 26 is moved so as to coincide with the center of the left and right direction, the reflection type photoelectric switch 38 faces the structural support 3. In this way, the slide type fork 2 is moved by the reflection type photoelectric switches 37, 38, 39 and 40.
The position of 3 can be confirmed.

[0011]

The present invention has the following effects due to the above-mentioned configuration. Since at least two article transfer devices are provided on the left-right movable table provided on the lifting table so as to be movable left and right, the left and right parts of the article transfer device are aligned so that the center of the article transfer device in the left-right direction coincides with the center of the article storage rack in the left-right direction. By moving the moving table to the left or right, that is, without moving the heavy stacker crane to the left or right, all the article transfer devices can store and take out the articles.

[Brief description of drawings]

FIG. 1 is a simplified plan view with an intermediate omitted, showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view along the line II-II of FIG.

FIG. 3 is an enlarged view of part A of FIG.

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

FIG. 5 is an enlarged cross-sectional view taken along the line VV of FIG. 3 with intermediate portions omitted.

6 is an enlarged sectional view taken along line VI-VI of FIG.

[Explanation of symbols]

 1 Rack device 19 Stacker crane 22 Lifting platform 23 Slide fork 26 Left and right moving platform

Claims (1)

[Claims] 1. A left-right movable table is provided on a lift table of a stacker crane that is provided on the front side of a rack device so as to be movable left and right, and at least two article transfer devices are provided on the left-right movable table. Stacker crane.