JP3193138B2 - Pallet movement prevention device for work loading platform - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading / unloading operation of a work, which is attached to a storage shelf for placing a work on a pallet and three-dimensionally storing the work, and used for loading / unloading the work to / from the pallet. The present invention relates to a device for preventing movement of a pallet on a table.

[0002]

2. Description of the Related Art Pallets are lifted and lowered by elevator lifters and stored in storage shelves of a three-dimensional warehouse, and the operation of transferring pallets between the lifters and the storage shelves or work loading / unloading tables is provided on the lifters. This is performed by a movable tracker engaging with the engaging recess of the pallet and moving on the lifter. The operation of loading / unloading the work onto / from the pallet on the work loading / unloading platform is performed by a forklift, a crane, or the like.

[0003]

The pallets themselves are made lightweight to facilitate transportation. For this reason, for example, an empty pallet may be displaced and moved with respect to the work loading / unloading table due to a slight external force applied during the loading / unloading operation. When such a pallet shift occurs, the tracker cannot engage with the engaging recess of the pallet, and the pallet cannot be stored in the storage shelf.

An object of the present invention is to provide a pallet movement preventing device which can prevent such a shift movement of a pallet on a work loading / unloading table, and can surely perform an operation for releasing the prevention.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a storage rack in which a tracker is provided so as to be able to travel in a horizontal direction on a lifter which can be raised and lowered in an elevator, and is stepped up and down. A pallet is constructed so that a pallet is taken in and out by a traveling operation of a tracker, and a loading / unloading operation of a work onto / from a pallet is performed at a work loading / unloading table adjacent to the storage shelf. With the transfer operation of the pallet to the pallet, an engaging member that is locked to the pallet and moves together with the pallet, and approaches the pallet in conjunction with the moving operation of the engaging member, and
A pallet movement prevention device having a stopper member that locks and prevents movement of the pallet placed at a predetermined position of the work loading / unloading table is provided, and when the pallet at the predetermined position comes off the work loading / unloading table, The pallet movement preventing device is formed so that the engaging member and the stopper member return to the standby position before the locking.

[0006]

[Function] With the movement of the pallet to the work loading platform,
The engaging member is locked to the pallet and moves together with the pallet, and in conjunction with the movement of the engaging member, the stopper member approaches the pallet, and stops when the pallet reaches a predetermined position. Is locked to prevent the pallet from moving, so that the pallet does not move even if an external force is applied to the pallet.

When the pallet at the predetermined position is detached from the work platform, the engaging member and the stopper member return to the standby position before the locking, and the pallet is prevented from moving.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The three-dimensional warehouse 1 illustrated in FIG. 5 has a structure in which a plurality of storage shelves 5 are vertically set by bridging a plurality of shelves between warehouse frames 3, 3,. The storage shelf 5 is placed on a pallet 7 (described later).
Is stored in

The operation of storing the pallet 7 in the storage shelf 5 or the operation of unloading the pallet 7 from the storage shelf 5 is performed by the elevator 9 installed in the three-dimensional warehouse 1. In order to carry out the operation of loading / unloading the work W on the pallet 7, a work loading / unloading table 11 is provided adjacent to the three-dimensional warehouse 1, as shown in FIGS. The elevator 9 in the illustrated example has a gate-shaped support frame 13 as shown in FIG.
And a lifter 15 that can move up and down along the support frame 13.
And a tracker 17 provided to be able to run on the lifter 15 in the horizontal direction.

The illustrated lifter 15 engages with the support frame 13 via rollers 21, 21,... Which are rotatably supported by the guide blocks 19, 19, and as shown in FIG. Are wound around the winding drums 25, 25, and the winding drums 25, 25 are rotated by a lifting motor 27 driven through a speed change mechanism (not shown), whereby the lifter 15 is moved. It is configured to move up and down.

The lifter 15 has a pair of tracker rails (not shown) which are long in the left-right direction of FIG. 1 and are arranged on each side of the front and back sides of the paper of FIG. 1, and a tracker roller (not shown) which sandwiches these tracker rails from above and below. The endless chain 33 is supported by the tracker 17, and the endless chain 33 is hung on the lower sprocket wheels 29, 31 on the lifter 15 on the left and right sides (the front and back sides in FIG. 1) of the tracker 17. Endless chain 33 is locked to tracker 17 and is driven by tracker drive motor 35 and its transmission mechanism 37.
Is rotated. On the lifter 15, a plurality of rollers 39 as a guide member for the pallet 7 transferred from the storage shelf 5 or the like are supported by a shaft.

Wheels 41, 41 are pivotally supported on the left and right sides (the front and back sides in FIG. 1) of the pallet 7 so that the transfer operation to the storage shelf 5 is performed with low resistance.
As shown in FIG. 2, a gate-shaped steel 43 is fixed to one end of the tracker 17, and locking recesses 47, 47 that can be fitted into the outer edge 45 of the gate-shaped steel 43 from below are provided on the left and right portions of the tracker 17. Each is provided.

With the above configuration, the vertical position of the lifter 15 is adjusted so that the tracker rail of the lifter 15 coincides with the height of the storage shelf 5 on which the pallet 7 is placed. The lifter 15 is slightly lifted up while looking into the locking recess 47 and the locking recess 4 is
7, the tracker drive motor 35 is driven to rotate the endless chain 33 so that the tracker 17 travels on the tracker rail, and the pallet 7 on the storage shelf 5 rides on the rollers 39 to lift the lifter 15. Will be transferred to At the time of this transfer operation, the pallet 7 is moved forward so that the side of the outer edge 45 locked to the tracker 17 is slightly higher than the other side (the rear side in this case) as shown in FIG. Since the vehicle travels while being inclined upward, the resistance at the time of transfer to the lifter 15 is sufficiently small.

In order to transfer the pallet 7 on the lifter 15 to the storage shelf 5, the operation of transferring the pallet 7 from the storage shelf 5 to the pallet 7 is reversed.

As shown in a side view in FIG. 2 and a plan view in FIG. 3, the illustrated work loading / unloading table 11 is provided on the upper surface of a base frame 49 framed in a cubic shape. Guide rails 51 and 51 are provided, and the pallet 7
Are guided by the guide rails 51, 51 so as to ride on predetermined positions of the work loading platform 11 as shown in FIG.

In this embodiment, the work loading / unloading platform 1
A pallet movement prevention device 53 (in the illustrated example, one set in each of the left and right directions of travel of the pallet 7) for preventing movement of the pallet 7 transferred to one predetermined position is provided.

The exemplified pallet movement prevention device 53 will be described. A block-shaped slide portion 61 is provided on an engagement member 59 having an L-shaped engagement portion 57 that can be engaged with the moving-side end portion 55 of the pallet 7, and a front upper surface member (a beam 63 in the illustrated example) of the base frame 49. , 65), the slide hole 69 of the slide portion 61 is fitted to the strip-shaped engagement member guide 67 fixed to the engagement member guide 6.
The pallet 7 is guided by the guide rails 51 and 51 so as to be movable in the same direction as the above-described guide direction (the left-right direction in FIGS. 2 and 3).

The inner edge 7 of the gate-shaped steel 43 of the pallet 7
Stopper member 75 having locking recess 73 that can engage with
To the rear upper surface member of the base frame 49 (the beam 77 in the illustrated example).
The stopper member 75 is guided by the stopper member guide 81 and moves up and down to move up and down the guide rails 51, 51.
The engagement concave portion 73 can be engaged with or separated from the inner edge portion 71 of the pallet 7 on the pallet 7.

The engaging member 59 and the stopper member 75
And a sprocket wheel 8 supported on a beam 77, for example.
It is connected by a chain 85 which is a connecting member around which 3 is wound.

In the illustrated example, the chain 85 is connected to the engaging member 59 via an adjusting bolt 87 for adjusting the tension. The roller 8 is attached to the stopper member 75 made of a flat plate.
9, 89; 89, 89 are pivotally supported to form the stopper member guide 81, the left and right guide plates 91, 91, 91 in FIG.
Rollers 89,... Are sandwiched from right and left in FIG. As shown in FIGS. 2 and 4, a lower end stopper 93 of a stopper member 75 is provided at the lower end of the guide plate 91, and the stopper member 75 is constantly urged downward by a stopper member return spring 95. I have.

With the above configuration, when the pallet 7 on the lifter 15 is transferred to the work loading / unloading table 11, the locking recess 47 of the tracker 17 is engaged with the outer edge 45 of the pallet 7. Then, the tracker 17 travels on the pallet 7 toward the work loading platform 11 to the left in FIG. In this transfer operation, the pallet 7 is moved so that the side of the outer edge 45 locked to the tracker 17 is slightly higher than the other side (the front side in the traveling direction in this case) as shown in FIG. They are running uphill. Wheels 41 of pallet 7,
Are guided by the guide rails 51, and the pallet 7 is gradually transferred to the work loading / unloading base 11.

Since the stopper member 75 is urged downward by the stopper member return spring 95, the stopper member 75 is at the lowest standby position where the lower end portion of the stopper member 75 contacts the lower limit stopper 93, and the locking concave portion 73 is a guide. Rail 51,
Are positioned so as not to protrude near the upper part of.

When the pallet 7 reaches a position near the predetermined position of the work loading / unloading table 11, the engaging portion 57 of the engaging member 59 is engaged with the moving side end 55 of the pallet 7, and the subsequent pallet is moved. With the leftward movement of 7, the engaging member 59 moves together with the pallet 7, and the stopper member 75 connected by the chain 85 is guided by the stopper member guide 81 and rises.

When the pallet 7 reaches a predetermined position on the work loading / unloading table 11, as shown in FIG.
The engaging recess 73 of the stopper member 75 is fitted into the pallet 1, whereby the movement of the pallet 7 is prevented, so that even if an external force is applied to the pallet 7, the pallet 7 does not move off. Pallet 7 is always placed at a predetermined position.

As described above, the pallet 7 is placed at a predetermined position without moving, so that, for example, after the work W is put on the pallet 7, the lifter 15 is moved out of the work loading / unloading table 11 to the storage shelf 5. When the tracker 17 is positioned and engaged with the pallet 7, the locking concave portion 47 of the tracker 17 can easily and reliably engage with the outer edge 45 of the pallet 7. Is completely gone.

Further, in order to transfer the pallet 7 on the work loading / unloading table 11 to the storage shelf 5 as shown in FIG. Immediately below the outer edge 45, the locking recess 4 of the tracker 17 is provided.
7 so that the lifter 15 can be positioned so that the lifter 15 is slightly raised, and then the lifter 15 is slightly raised to engage the locking concave portion 47 with the outer edge 45.
Pallet 7 so that the side of 5 is slightly higher than the other side
Is tilted, the inner edge 71 of the pallet 7 is disengaged from the locking concave portion 73 of the stopper member 75, and the movement inhibition of the pallet 7 is released. Then, the tracker drive motor 35 is driven in a direction in which the pallet 7 moves away from the work loading / unloading base 11 to rotate the endless chain 33, whereby the tracker 17 travels on the tracker rail, and the pallet 7 is moved to the work loading / unloading base 1
1 is transferred to the lifter 15. When the pallet 7 starts to move to the lifter 15 in this way, the stopper member return spring 9
5, the stopper member 75 urged downward moves downward to return to the lowest standby position where the lower end of the stopper member 75 contacts the lower limit stopper 93. At this time, the locking recess 73 is moved to the guide rail 51. Are prevented from protruding near the upper part of the pallet 7, and the operation of preventing the movement of the pallet 7 of the pallet movement preventing device 53 is surely released, so that the structure is simple and a useful pallet movement preventing device.

The present invention is not limited to the above-described embodiment, but can be embodied in other forms by making appropriate changes. For example, work loading platform 1
1. The structures of the engaging member 59, the stopper member 75, and the like, which constitute the pallet movement prevention device 53, can be replaced with various shapes other than the illustrated example.

[0028]

As described above, according to the present invention, with the movement of the pallet to the work loading / unloading table, the engaging member is engaged with the pallet and moves together with the pallet, and the moving of the engaging member is performed. In conjunction with the operation, the stopper member approaches the pallet, and when the pallet arrives at a predetermined position, the stopper member is locked to the pallet to prevent the pallet from moving, and the pallet is displaced even if external force is applied to the pallet. It doesn't move. With this, after the work is put on this pallet, when the tracker of the lifter is aligned with and engaged with this pallet so as to be carried out from the work loading / unloading table to, for example, the storage shelf of the three-dimensional warehouse, the tracker is easily placed on the pallet. And it can engage reliably. When the pallet at the predetermined position is detached from the work loading / unloading table, the engaging member and the stopper member return to the standby position before the locking, the movement preventing operation of the pallet is reliably released, and the structure is simple and useful. It becomes a pallet movement prevention device.

[Brief description of the drawings]

FIG. 1 is a side view showing a crane and a work loading platform to which an embodiment of a pallet movement prevention device according to the present invention is applied.

FIG. 2 is an enlarged side view of the pallet movement prevention device in FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is an enlarged side view showing the operation of the pallet movement prevention device in FIG. 1 during operation.

FIG. 5 is a perspective view showing a three-dimensional warehouse, a crane, and a work loading / unloading table to which the embodiment of the pallet movement prevention device of FIG. 1 is applied;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Three-dimensional warehouse 5 Storage shelf 7 Pallet 9 Elevator 11 Work loading / unloading stand 15 Lifter 17 Tracker 53 Pallet movement prevention device 59 Engagement member 75 Stopper member W Work

Claims (1)

(57) [Claims] 1. A tracker is provided on a lifter which can move up and down in an elevator so as to be able to travel in a horizontal direction, and a pallet is moved in and out of a storage shelf which is stepped up and down by a tracker. The loading / unloading operation of the work is performed at the work loading / unloading table adjacent to the storage shelf, and the pallet is transferred to the work loading / unloading table by the tracker. An engaging member that moves with the pallet, approaches the pallet in conjunction with the above-described movement of the engaging member, and engages with the pallet placed at a predetermined position on the work loading / unloading platform to move the pallet. A pallet movement prevention device having a stopper member for preventing the pallet from moving is provided when the pallet at the predetermined position comes off the work loading / unloading table. A pallet movement prevention device for a work loading platform, wherein the pallet movement prevention device is formed so as to return.