JPH07187328A - Stacker crane - Google Patents

Abstract

PURPOSE:To accurately detect the size of a cargo and collapse of a load stack of a small cargo by arranging sensors to detect the size of the cargo mounted on a raising-lowering stand of a crane as well as to detect the collapse of a load stack of the small cargo, on the raising-lowering stand in a stacker crane to handle two kinds of large and small cargoes. CONSTITUTION:The size of a pallet mounted on a raising-lowering stand 3 is detected, and collapse of a load stack of a small cargo W2 mounted on a small pallet P2 is detected. A pair of sensors 10 composed of a light emitting unit 10a and a light receiving unit l0b are respectively arranged at intervals L2 slightly wider than a width dimension L1 of the small pallet P2. That is, the optical axes Y1 and Y2 of the light emitting unit 10a are passed through the vicinity of both side parts of the small cargo W2 mounted on the small pallet P2. After the pallet is mounted, for example, either one of the optical axes Y1 and Y2 is intercepted, and when one sensor 10 is turned off, it is judged such that the small pallet P2 is mounted on the raising-lowering stand 3 and the small cargo W2 of the pallet P2 causes collapse of a load stack.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacker crane capable of handling large and small loads. In particular, the present invention relates to a stacker crane that can confirm the size of a load and the collapse of a small load.

[0002]

2. Description of the Related Art FIG. 4 is a schematic front view showing a conventional stacker crane capable of handling two types of conventional large and small loads. FIG. 5 is a schematic front view of the elevator as well.

In these drawings, reference numeral 1 denotes a traveling body of a crane, which is adapted to travel along a rail R provided on the floor of a building. Reference numerals 2 and 2 denote a pair of masts provided on the traveling body 1. Reference numeral 3 is an elevating table that moves up and down along the pair of masts 2 and 2. Reference numeral 4 is a slide fork provided on the lifting table 3, and moves back and forth with respect to the shelf T to load large and small loads W on two types of pallets P1 and P2 of large and small.
1 and W2 are put in and taken out.

Reference numeral 5 denotes a photoelectric switch provided on the lifting table 3, which is turned on and off to detect the size of the pallets P1 and P2 mounted on the lifting table 3.

Reference numeral 6 is a detection wire for detecting the collapse of the heavy load W1 mounted on the lifting table 3.

The shelf T has two large and small racks R1 and R2 in accordance with the large load W1 and the small load W2.

In such a stacker crane, after the traveling body 1 travels toward the shelf T, the lifting platform 3 reaches a predetermined position.
Is controlled to move up and down, and the slide fork 4 of the lift table 3 moves back and forth to load the load W1 or W with the rack R1 or R2.
It is designed to hand over 2.

When a pallet is mounted on the lift table 3, both the photoelectric switches 5 and 5 are simultaneously turned on or off to detect the size of the pallet and specify the size of the loaded load. .

When the heavy load W1 collapses on the lift table 3, the detection wire 6 detects this and the crane is stopped under the control of a control unit (not shown), which causes the load collapse. Is confirmed.

[0010]

In the conventional stacker crane described above, it was possible to confirm the size of the load mounted on the lifting platform and the collapse of the large load. Since it could not be confirmed, it was not possible to prevent accidents due to collapse of small loads.

An object of the present invention is to solve the above problems and to provide a stacker crane capable of preventing accidents due to collapse of small loads.

[0012]

In order to achieve the above object, the stacker crane of the present invention is a stacker crane that handles two types of loads, large and small, and detects the size of the load mounted on the lifting platform of the crane. A sensor for detecting a collapse of a small load is provided on the lift table.

[0013]

Since the present invention has the above-described structure, the following operational effects are obtained.

That is, since the lifting platform of the crane is provided with a sensor capable of detecting the size of the load mounted on the lifting platform and detecting the collapse of the small load, You can check the collapse of large and small items.

Therefore, according to the stacker crane of the present invention, there is an effect that it is possible to prevent an accident due to a collapse of a small load.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic front view of a lifting platform showing an embodiment of a stacker crane according to the present invention.

In the figure, the stacker crane of this embodiment can detect the size of the pallets mounted on the lifting platform 3 and the collapse of the small load W2 mounted on the small pallet P2. A pair of sensors 10, 10 are provided on the lifting table 3.

As the pair of sensors 10, 10, there is a transmissive photoelectric switch or the like.

Numerals 10a and 10a are light emitters of the sensor 10,
Reference numerals 0b and 10b are also light receivers. The light-emitting device 10a and the light-receiving device 10b are arranged with a space L2 which is slightly wider than the width dimension L1 of the small pallet P2.

As a result, the optical axes Y1 and Y2 of the light emitters 10a and 10a, as shown in FIG.
It is designed to pass near the both sides of the small load W2 mounted on the vehicle 2.

Reference numeral 15 is a control unit, which is a pair of sensors 10,
Based on the detection signal from 10, the size of the pallets mounted on the lift 3 and the collapse of small loads are determined.

The determination of the controller 15 based on the detection signals from the pair of sensors 10, 10 is performed as follows.

When the optical axes Y1 and Y2 are not shielded after the pallet is mounted and both the sensors 10 and 10 are turned on, the small pallet P2 is placed on the lift 3 as shown in FIG. Judge that it is installed.

When both the optical axes Y1 and Y2 are blocked and both the sensors 10 and 10 are turned off, as shown in FIG.
As shown in, it is determined that the large pallet P1 is mounted on the lift table 3.

Further, in the case where one of the optical axes Y1 and Y2 is blocked and one sensor 10 is turned off, FIG.
As shown in (c), it is determined that the small pallet P2 is mounted on the lifting platform 3 and the small load W2 of the pallet P2 has collapsed.

The collapse of the large load W1 is detected by the detection wire 6 as in the conventional case.

According to the stacker crane of this embodiment described above, the sensor 10 provided on the lifting platform 3 of the crane detects the size of the load mounted on the lifting platform 3 and collapses the small load. Is detected, the size of the load and the collapse of the load can be confirmed.

Therefore, according to the stacker crane of this embodiment, it is possible to prevent accidents due to collapse of small loads.

FIG. 3 is a schematic front view of a lift table showing another embodiment of the stacker crane according to the present invention.

This embodiment is different from the above embodiment in that
The sensor 20 for detecting the collapse of the small load W2 and the sensor 30 for detecting the size of the pallet are separately provided.

The sensor 20 is arranged at a distance L2 wider than the width dimension L1 of the small pallet P2 as in the above-described embodiment, and the control unit 15 controls when one of the sensors 20 is turned off. Judge that there was a collapse of a small load.

The sensors 30 are arranged at a distance L3 wider than the distance L2 between the sensors 20, and the control unit 15 causes the large pallet P1 to be activated when both the sensors 30 are turned off.
It is determined that the small pallet P2 is mounted when the sensors 30 are both turned on.

According to the stacker crane having the two sensors 20 and 30 as described above, in addition to the function and effect shown in the above-mentioned embodiment, the sensors 20 and 30 are independently provided, so that the load W2 is There is an effect that a load collapse can be detected with certainty.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention.

[0036]

[Brief description of drawings]

FIG. 1 is a schematic front view of a lifting platform showing an embodiment of a stacker crane according to the present invention.

FIG. 2A to FIG. 2C are explanatory views of the operation.

FIG. 3 is a schematic front view of a lifting platform showing another embodiment of the stacker crane according to the present invention.

FIG. 4 is a schematic front view showing a conventional stacker crane.

FIG. 5 is a schematic front view of the lifting table.

[Explanation of symbols]

 3 Lifting table 10 Sensor

Claims (1)

[Claims] 1. A stacker crane that handles two types of loads, large and small, is provided with a sensor for detecting the size of the load mounted on the lifting platform of the crane and for detecting the collapse of the small load. Characteristic stacker crane.