JPH11349107A - Cargo base of automatic warehouse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cargo base for an automatic warehouse furnished with a cargo loosening prevention means capable of correcting positional deviation of a cargo in simple structure and without being influenced by frictional resistance. SOLUTION: A plural number of rollers 32 for cargo supporting are provided on a cargo receiving surface 30 of a cargo receiving base 28. Free rollers 34 for cargo loosening prevention are installed on both end edges of the cargo receiving base so as to be positioned above the outside of the cargo receiving surface. Consequently, even wen a cargo 35 is loosened and lowered against the cargo receiving surface, this positional deviation is corrected as the free roller for cargo loosening prevention is rotated by a gravitational component of the cargo, and the cargo is guided onto the cargo receiving surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving tray of an automatic warehouse, and more particularly to a structure for preventing a load from being displaced.

[0002]

2. Description of the Related Art As shown in FIG. 4, in an automatic warehouse 1, racks 2 are erected in a vertical direction, and are placed on rails 4 laid opposite to a loading / unloading opening 3 of these racks 2. The stacker crane 5 runs on its own. The stacker crane 5 is provided with a carriage 6 having a telescopic fork so as to be able to move up and down. Also,
At a position along the rail 4, a load receiving table 8 for transferring the load 7 is provided. That is, the load 7 transferred from the rack 2 to the receiving tray 8 by the carriage 6 is further transported from the receiving tray 8 to another place by a transport device such as a forklift, or is transported to the receiving tray 8 by the transport device. The load 7 was stored in the rack 2 from the load receiving table 8 by the carriage 6.

However, due to the stopping accuracy of the stacker crane 5 and the installation accuracy of the receiving tray 8, the receiving tray 8 is not always able to receive the load 7 at the same position. There is a danger that it will be difficult to carry out the subsequent load receiving work, or that the load 7 may protrude and be placed on the self-propelled route of the stacker crane 5. For this reason, the load receiving stand 8 has conventionally been provided with a load shift preventing means.

A description will now be given, with reference to FIGS. As shown in FIG. 4, fixed guides 9 extending in a direction orthogonal to the self-running direction of the stacker crane 5 are fixed to both ends of the receiving tray 8. This fixed type fixed guide 9
As shown in FIG. 5, it has a plate-like member 11 which is inclined outward as it goes upward. As a result, even if the load 7 placed on the dedicated pallet is lowered outwardly with respect to the loading tray 8, the lower corner 10 of the pallet that is shifted outward slides down while abutting the fixed guide 9. Is guided inward by the plate-like member 11 of the fixed guide 9, and the position thereof is appropriately corrected.

[0005] Further, another conventional load shift preventing means is shown in FIG.
Shown in The load shift prevention means has a movable pallet stopper 12 provided at both ends of the load receiving table 8 so as to be swingable by an electric cylinder 13. The load 7 is open outward until the load 7 is completely unloaded. After the load 7 is completely unloaded on the load receiving surface 14, the load 7 is closed so as to sandwich the load 7 from both sides to correct the position shift of the load 7. Whether the load 7 has been completely unloaded on the load receiving surface 14 is checked by a sensor. In addition, since the load receiving surface 14 is provided with a plurality of rollers 15 extending in a direction orthogonal to the self-running direction of the stacker crane 5, when the pair of left and right pallet stoppers 12 is closed, the load 7 moves in the self-running direction. It can be easily moved.

[0006]

However, in the conventional structure provided with the fixed type load shift preventing means shown in FIG. 5, the lower portion 10 of the pallet on which the load 7 is placed and the fixed type guide 9 are provided. In some cases, the load 7 did not slide down properly due to the generated frictional resistance. Further, when the pallet is formed of a thin iron plate, there is a possibility that the lower corner portion 10 of the pallet may be shaved when sliding down due to the frictional resistance.

On the other hand, in the structure shown in FIG. 6 having a conventional movable load shift preventing means, a load 7 is detected by using a sensor.
It is necessary to determine the presence or absence of the problem, and since there are many movable parts, there is a problem that the mechanism becomes complicated and operation adjustment becomes difficult. Further, a mechanism for synchronizing and operating the left and right pallet stoppers 12 is required.

Accordingly, the present invention has been made in order to solve such a problem of the prior art, and can correct the displacement of a load with a simple structure and without being affected by frictional resistance. An object of the present invention is to provide a receiving tray for an automatic warehouse provided with a load shift preventing means.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention relates to a load receiving table of an automatic warehouse which transfers a load on a load receiving surface by contacting a load which is displaced and placed. A load shift preventing free roller for correcting the position of the load by rotating the load by its own weight is disposed above and outside the edge of the load receiving surface.

It is preferable that the load receiving surface is provided with at least one load supporting free roller parallel to the load shift preventing free roller. Further, a plurality of frusto-conical guide rollers may be provided on both side edges of the load receiving surface such that the diameter thereof becomes smaller toward the top.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a peripheral portion of a receiving table according to an embodiment of the present invention. Automatic warehouse 2
1, racks 22 are erected in a vertical direction, and a stacker crane 25 runs on rails 24 laid opposite the unloading ports 23 of the racks 22. The stacker crane 25 is provided with a carriage 26 having a fork that can be extended and retracted. At a position along the rail 24, a load receiving table 28 on which the load 27 is placed is provided.

As shown in FIG. 2, the receiving tray 28 has a receiving tray frame 29 made of an angle material, C-shaped steel, or the like, and a receiving surface 30 for transferring a load is provided on the upper surface of the receiving tray 28. Are formed. On the receiving surface 30,
Notches 31 are formed at regular intervals to allow the forks of the carriage 26 to escape when loading and unloading the load.
A plurality of load supporting free rollers 32 extending in a direction perpendicular to the longitudinal direction are spaced apart from each other in the longitudinal direction. The load supporting free rollers 32 not only support the load placed on the load receiving surface 30, but also support the load receiving surface 30.
To improve the longitudinal load slip.

A bracket 33 is provided at both end edges of the load receiving frame 29 so as to extend upward and outward of the load receiving surface 30. The upper end of the bracket 33 has a direction perpendicular to the longitudinal direction of the load receiving table 28. Is attached with a free roller 34 for preventing a load from shifting, the rotation axis of which is extended. The load shift preventing free roller 34 is disposed above the position where the load supporting free roller 32 is installed so that the position of the load 35 lowered from above can be corrected.

Further, guide rollers 36 are arranged on both side edges of the load receiving frame 29 so as to be spaced apart from each other in the longitudinal direction of the load receiving table 28. The guide roller 36 has a vertical rotation shaft, and is formed in a truncated conical shape such that the diameter thereof becomes smaller toward the upper part.

According to the cargo receiving stand of the automatic warehouse according to the present embodiment configured as described above, as shown in FIG. 3A, the load 35 transferred by the carriage 26 is placed on the receiving surface. When it is lowered in a state shifted in the longitudinal direction with respect to the load 30, the lower corner portion 37 of the load 35 comes into contact with the load shift preventing free roller 34 as shown in FIG.
The tangential component of the load shift preventing free roller 34 acting on 5 acts on the load shift preventing free roller 34, and the load shift preventing free roller 34 rotates. Thereby, the load 35 is corrected in the longitudinal direction with respect to the load receiving surface 30 while falling.

In such a displacement correction of the load,
Since the load 35 and the slippage preventing free roller 34 do not slide with each other, there is no problem that the load does not slide down due to frictional resistance unlike the conventional case. There is no shaving. In addition, even when a metal pallet is used, no abnormal noise is generated.

Further, since only the free roller 34 for preventing the displacement of the load is used, the structure is simple, and the displacement of the load 35 is corrected only by dropping under its own weight.
Like the structure with the conventional movable type load shift prevention means,
There is no need for a mechanism for determining the position of the load or a dedicated drive mechanism for load shift prevention means. In addition, since it is sufficient if only the load displacement preventing free roller 34 in the direction in which the load 35 is displaced functions, a mechanism for synchronizing the operation of the position displacement preventing means at both ends as in the related art is unnecessary.

When the load 35 is shifted and lowered, one end of the load 35 may be placed on the free roller 33 for prevention and the other end may be positioned on the load receiving surface 30, and the posture of the entire load 35 may be inclined. Even in such a case, the other end of the load 35 is easily slid on the load receiving surface 30 by the function of the load supporting free roller 32 disposed on the load receiving surface 30, so that the load 35 is prevented from slipping. Rotation of the free roller 34 for
The displacement of the entire load 35 is corrected.

Further, when the load 35 is unloaded with the load 35 deviated from the load receiving surface 30 in the direction perpendicular to the longitudinal direction thereof, the load is guided by the frusto-conical inclination of the guide roller 36 to correct the deviation. Is done.

[0020]

As described above, according to the load receiving table of the present invention, it is possible to correct the displacement of the load with a simple structure and without being affected by the frictional resistance. Further, if at least one load supporting free roller is provided on the load receiving surface in parallel with the load shift preventing free roller, the end of the load is easy to slide on the load receiving surface, and the position of the load shift preventing free roller is rotated. The displacement can be more reliably prevented. Furthermore, by providing a plurality of frusto-conical guide rollers in such a manner that the diameter becomes smaller toward the upper side on both side edges of the load receiving surface, the load is shifted with respect to the load receiving surface in the longitudinal direction and the vertical direction. Even when the guide roller is lowered, the guide roller is guided by the frusto-conical inclination of the guide roller to correct the positional deviation.

[Brief description of the drawings]

FIG. 1 is a plan view of the vicinity of a receiving table according to an embodiment of the present invention.

FIG. 2 is a plan view of the receiving table according to the embodiment of the present invention.

FIG. 3 is a front view showing one end of a receiving table according to the embodiment of the present invention, and (a), (b) and (c) are views showing a discharging process, respectively.

FIG. 4 is a plan view of the vicinity of a conventional receiving table.

FIG. 5 is a front view showing a conventional fixed-type load shift preventing unit.

FIG. 6 is a front view showing a conventional movable load shift preventing unit.

[Explanation of symbols]

 28 Load receiving table 30 Load receiving surface 32 Free roller for load support 34 Free roller for preventing load shift 35 Load 36 Guide roller

Claims (3)

[Claims] Claims: 1. In a load receiving table of an automatic warehouse for transferring a load on a load receiving surface, when a load placed in a shifted position comes into contact with the load, the load is rotated by its own weight to correct the position of the load. A cargo receiving stand for an automatic warehouse, wherein a free roller for prevention is arranged on an upper side outside along an edge of the receiving surface. 2. The load receiving table according to claim 1, wherein the load receiving surface is provided with at least one load supporting free roller parallel to the load shift preventing free roller. 3. A frusto-conical guide roller having a plurality of guide rollers whose diameters become smaller toward the upper part thereof are provided on both side edges of the load receiving surface. Receiving platform described in.