JPH0585447B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pallet receiver for a multi-level warehouse.

[Conventional technology]

A multi-story warehouse consists of a stacker crane that transports pallets and a large number of shelves installed along the travel path of the stacker crane. The stacker crane transports goods between the storage entrance and the shelves.

In such a multi-storey warehouse, the first floor is used as the loading/unloading area, the second floor and above are used as the storage area, and one
There is one in which a lifter connects the loading/unloading port on the floor and the transfer port in the shelf on the second floor. An example of such a three-dimensional warehouse is Japanese Utility Model Application Publication No. 154903/1983.

[Problem that the invention seeks to solve]

In such a multi-level warehouse, the following configuration may be considered in order to shorten the time required for loading and unloading. For example, in the case of warehousing, when a lifter lifts up a pallet that has been placed in the loading/unloading port for storage, the support member of the support device installed at the loading/unloading port of the shelf protrudes to support the pallet and lift it up. The lifted lifter is lowered to prepare for loading the next pallet. On the other hand, the stacker crane takes in the pallet supported by the support device, conveys it to a predetermined shelf, and stores it.

According to this, when a pallet is lifted by a lifter, even if the stacker crane is not available, the lifter can descend and begin warehousing the next pallet.
On the other hand, stacker cranes can also perform other tasks. Therefore, the warehousing time can be shortened.

The same applies to shipping.

By the way, the pallet at the transfer port is supported by a protruding support member. This command to retreat the support member should be issued when there is no pallet, such as when a stacker crane is used to remove the pallet. However, if the supporting member with the pallet on it retreats due to noise or the like, the pallet will fall, resulting in an accident.

An object of the present invention is to prevent pallets from falling due to malfunction of the support device.

[Means for solving problems]

The present invention provides an engaging portion between the pallet and the support member, and a safety device that stops the operation when a force exceeding a predetermined value is required to retreat the support member is provided in the drive device for the support member. It is characterized by

[Effect]

When a command is given to move the support member backward with a pallet on it, the engaging portion of the support member engages with the pallet, increasing the load on the drive device, activating the safety device, and stopping the drive device. Therefore, the support member stops retreating, and the pallet can be prevented from falling.

In the present invention, a pallet includes a load. In addition, the warehouse entrance means at least one of the warehouse entrance and the warehouse exit.

〔Example〕

The present invention will be explained below with reference to an embodiment shown in the drawings. In FIG. 3, 1 is a shelf group consisting of a large number of shelves, and is installed on the floor 3 on the second floor. A stacker crane (not shown) travels along the shelf group 1 on the floor 3. Floor 3 rests on pillars (not shown) erected on the ground GL. Reference numeral 5 indicates an entry/exit entrance provided on the ground floor GL on the first floor, and is located below the transfer port 6 of the shelf group 1. The loading/unloading port 5 is connected to the transfer port 6 by a lifter 7 that lifts and lowers a pallet 10 thereon.
A support device 20 for supporting the pallet 10 is installed at the bottom of the transfer port 6. The support devices 20 are provided at both ends of the shelf group 1 in the longitudinal direction, that is, in the traveling direction of the stacker crane. two support devices 2
0.20 constitutes one support device. FIG. 3 shows the pallet 1 with the supporting member 21 of the supporting device 20 protruding.
0 is shown, and the distance between the support members 21, 21 of the two support devices is larger than the dimension of the lifter 7 in the same direction. For this reason, the support member 21
The lifter 7 can be raised and lowered in a state where it is protruded.

The configuration of the support device 20 will be explained with reference to FIGS. 1 and 2. The support member 21 is an L-shaped member, and its horizontal piece supports the pallet 10, and its vertical piece supports the shelf group 1.
This serves as a stopper to prevent the pallet 10 from moving in the longitudinal direction. The support member 21 is fixed via a pin 25 to the upper surface of the tips of levers 24a and 24b installed on the shelf view 1 so as to be horizontally rotatable about a pin 23. The levers 24a and 24b are horizontally rotatable with respect to the support member 21. Two pins 23, 23 and two pins 25, 25 constitute a parallelogram link. Reference numeral 27 denotes an electric cylinder as a driving machine for driving the support member 21, and the tip of its telescopic rod is horizontally rotatably connected to the other end of the lever 24a. The electric cylinder 27 is installed in the shelf group 1. The electric cylinder 27 is installed horizontally, and its cylindrical portion is installed on the shelf group 1 so as to be horizontally rotatable. 29a, 29b
A stopper is installed on the upper surface of the support member 21 so as to project upward, and is inclined toward the back surface of the pallet 10.

In the figure, the electric cylinder 27 of the left support device 20 is connected to the lower lever 24a, and the right support device 20 is connected to the upper lever 24a. That is, the configuration of the left and right support devices 20, 20 is a pair in the vertical direction in the figure.

The motor of the electric cylinder 27 is equipped with a current limiting relay, which stops operation due to overload.

When the rod of the electric cylinder 27 is protruded, the support member 21 protrudes as shown by the solid line and can support the pallet 10. When the rod of the electric cylinder 27 is retracted, the support member 21 moves back as shown in the imaginary line.
The distance between the tips of the supporting members 21, 21 is
It will be larger than the length of 0. In this state, the pallet 10 is moving up and down.

Both ends and the center of the pallet 10 in the width direction protrude upward. That is, the pallet 10 has concave grooves 11 along the longitudinal direction near both ends. The bottom of this groove 11 contacts the support member 21 . Two stoppers 29 are provided in the convex portion between the two grooves 11, 11.
a, 29b are located. Stopper 29a, 2
There is a gap between 9b and the groove 11 in its vicinity.

In such a configuration, during warehousing operation, when the pallet 10 to be warehousing is lifted by the lifter 7,
The support member 21 protrudes and the pallet 1 descends.
Support 0. During unloading operation, the pallet 10 that is placed on the forks of the stacker crane and descends is supported.

The support member 21 is moved back while the pallet 10 is being lifted up by a fork or lifter 7.

Now, when a signal for retracting the support member 21 is given to the support devices 20, 20 while the support member 21 is supporting the pallet 10, the electric cylinder 27 attempts to retract the rod. Therefore, in the figure, the left support member 21 moves downward, and the right support member 21 moves upward. Therefore, the lower stopper 29b of the left support member 21 is in the groove 1.
1, and the upper stopper 29a of the right support member 21 hits the slope of the groove 11. For this reason,
Each support member 21 can no longer move, the motor of the electric cylinder 27 is overloaded, and the current limiting relay is activated to stop operation.
Therefore, it is possible to prevent the pallets from falling.

Since the supporting members 21, 21 are moving in opposite directions as described above, overload can easily occur and the operation can be stopped. Even when moving in the same direction, the stoppers 29a, 29b engage with the pallet 10, so overload occurs. stoppa 29
It is certain that a and 29b are inserted into the holes of the pallet 10.

If the electric cylinder is a hydraulic cylinder, overload can be detected and operation can be stopped using the relief setting pressure of a relief valve disposed in the hydraulic circuit.

〔Effect of the invention〕

According to the present invention, even if an attempt is made to malfunction while a pallet is being loaded, the operation is automatically stopped, thereby preventing the pallet from falling.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a pallet support device according to an embodiment of the present invention, FIG. 2 is a - perspective view of FIG. 1, and FIG.
The figure is a vertical sectional view of a multi-story warehouse according to an embodiment of the present invention. 1... Shelf group, 3... Floor, 5... Entrance/exit, 6...
...transfer port, 10...pallet, 20...support device, 21...support member, 27...electric cylinder,
29a, 29b...stoppa.

Claims (1)

[Scope of Claims] 1. A shelf group having a large number of shelves for storing pallets, a conveyance means for carrying pallets and moving along the shelf group, and a shelf of the shelf group on which supporting members for supporting the pallets are installed. On the other hand, in a multi-story warehouse comprising a lifter for vertically conveying pallets, the support member is provided to be movable forward and backward, and the pallet is provided so as to be able to pass vertically when the support member is moved backward. and a stopper that engages with the pallet is provided on the upper surface of the support member, and a safety device is provided in the drive device for advancing and retracting the support member to stop the support member if an overload occurs when the support member is retracted. A distinctive three-dimensional warehouse.