JP2874403B2 - Stacker crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacker crane. In particular, the present invention relates to a stacker crane that can prevent a pallet from floating due to an unbalanced load when the pallet is pulled out.

[0002]

2. Description of the Related Art Heretofore, loading and unloading of a stacker crane has been performed using a slide fork provided on a lifting platform of the crane. For this reason, the shelf must be provided with a space for inserting a slide fork, so that the entire shelf becomes high and the crane becomes large.

As a means for solving this, the present applicant has filed an application for a stacker crane having a drawer on a lift (Japanese Patent Application No. 2-161063).

FIG. 13 is a front view of the stacker crane,
FIG. 14 is a right side view, and FIG. 15 is a plan view.

[0005] The stacker crane includes a lift 15 that moves up and down along the front mast 5 and the rear mast 6,
A pair of drawers 20, 20 provided on the left and right sides of the upper surface of the lift 15, and chain conveyors 30, 30 provided on the lower frame 4 are provided.

As shown in FIG. 15, a pair of drawer portions 20, 20 are provided with drawer main bodies 21, 21 and advance / retreat means 25.
It consists of The drawer bodies 21 and 21 are guided by rails 16 and 16 provided on the elevating platform 15 and move forward and backward on the elevating platform 15 by the advancing and retreating means 25. The pallet is hooked by claws 22 provided on the front and rear of the drawer body 21.

As shown in FIGS. 13 and 15, a pair of chain conveyors 30 are provided before and after the lower frame 4, and include a driving motor 31, chains 32, 32 rotated by the driving motor 31, and these chains. 32,3
2 that drive the sprocket 2.

In the chain conveyor 30 having such a configuration, when the elevator 15 is lowered onto the lower frame 4, the transport surface 30a of the chain conveyor 30 is
5 is located above the upper surface portion 15a, and as a result, the drawer portion 20 of the lifting platform 15 is located below the transport surface 30a of the chain conveyor 30.

The delivery of the pallets from the shelves of the stacker crane having such a structure to the station is performed as follows.

First, the pallet 60 is hooked on the claws 22 of the drawer main body 21, and the pallet 60 is pulled out from the shelf 50 to the lift 15. Then, the lift 15 is moved to the lower frame 4.
The pallet 60 is lowered and transferred to the chain conveyor 30 of the lower frame 4. As a result, the drawer main body 21 becomes lower than the conveying surface 31a of the chain conveyor 30, and the pawls 22 of the drawer main body 21
Get off.

Thereafter, the drive motor 31 of the chain conveyor 30 is driven to rotate the chain 32 and move the pallet 60 to the station side. At the same time, the drawer main body 21 is moved by the reciprocating means 25 of the lift 15.
Is moved to the shelf 50 side, and the claw 22 of the drawer body 21 is moved.
Is engaged with the pallet 60.

Then, the drawer main body 21 is moved to the station side by the advance / retreat means 25. This allows
The pallet 60 moves to the station side and is discharged.

As described above, the pallet 60 pulled out from the shelf 50 passes through the elevating platform 15 and then leaves the station via the chain conveyor 30.

[0014]

As described above, the pallet 60 is hooked on the claw 22 of the drawer portion and pulled out onto the lift 15. Pallet 6
In the case of No. 0, the side of the drawer portion which is hooked on the claw 22 is slightly lifted and pulled out. In such a case,
The pallet 60 was lifted up from the elevating platform, and it was not possible to smoothly draw out the pallet.

An object of the present invention is to provide a stacker crane capable of solving the above problems and preventing the pallet from being lifted due to an unbalanced load when the pallet is pulled out, so that the pallet can be drawn out smoothly. It is in.

[0016]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 comprises a lifting platform that rises and falls along a mast, a conveyor provided on a frame below the mast,
A drawer portion provided on the lift table so as to be able to move forward and backward, and a drawer portion for pulling the pallet into and out of the lift table by hooking the pallet; together but is provided on the lifting platform, Noboru
Lower the platform to the bottom of the mast and
When transferring the unit to the conveyor on the lower frame side,
The roller unit moves to a position where it does not interfere with the pallet . Further, according to the invention of claim 2, when the pallet on the elevator is lowered to the lowermost stage of the mast and the pallet on the elevator is transferred to the conveyor on the lower frame side, the roller is brought into contact with the roller portion. In addition, a rod that pushes the roller unit upward with respect to the lifting platform is provided upright.

[0017]

[Effects] The present invention has the above-described structure, and thus has the following effects.

That is, since the roller unit for holding the pallet and preventing the pallet from being lifted is provided on the elevating platform, the pallet can be prevented from rising even if an unbalanced load is applied to the pallet when the pallet is pulled out.

The roller moves to a position where the roller does not interfere with the pallet when the pallet is moved down to the lowermost stage of the mast and the pallet is transferred to the conveyor on the lower frame side. rather than name can lead to, transfer of pallets from the lifting platform to the conveyor
Loading can be performed smoothly. This also gives
Subsequent transfer of pallets by conveyor is also smooth.
I can. Further, the lower frame is provided with a rod which lowers the elevator to the lowermost stage of the mast, abuts on the roller when transferring the pallet to the conveyor on the lower frame side, and pushes the roller upward with respect to the elevator. , The pressing of the pallet by the roller unit can be released by using the elevating operation of the elevating table.

Therefore, according to the stacker crane of the present invention, there is an effect that the pallet can be smoothly pulled out by preventing the pallet from being lifted due to an unbalanced load when the pallet is pulled out.

[0021]

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

FIG. 1 is a front view showing an embodiment of a stacker crane according to the present invention, FIG. 2 is a right side view thereof, FIG. 3 is a plan view, and FIG. 4 is a view when a lifting platform is lowered onto a lower frame. FIG. 5 is a right side view of FIG.
6 is a partially cut-away enlarged front view of the roller portion, FIG. 7 is a right side view of FIG. 6, FIG. 8 is a plan view of FIG. 7, and FIG. 9 is a view of the rod in FIG. Parts corresponding to those shown in FIGS. 13 to 15 are denoted by the same reference numerals.

In these drawings, reference numeral 40 denotes the elevator 15
2 and 3, as shown in FIGS.
A pair of pallet entrances P1 at one end of the lift 15 are provided facing each other. This pair of roller portions 4
The components 0 and 40 are symmetrically arranged.

As shown in FIGS. 6 to 8, the roller section 40
It comprises a base 41, a lever 42, a guide roller 43, and a weight 44.

The base 41 is fixed to both sides 15c of the lift 15 and is located at a position where it does not interfere with the pallet 60 drawn out to the lift 15 unless the pallet 60 is inclined. As shown in FIG. 6, the lever 42 is formed in a substantially L-shape, and is rotatably supported via a bearing 45 in a hole 41 a formed in the base 41. 7 and 8, reference numeral 46 denotes a stopper for restricting the rotation of the lever protruding from the side surface of the base 41 so as to abut the lever 42 so as to restrict the rotation of the lever 42 in the direction of arrow A in FIG. Has become. The lever 42 is arranged to be inclined by 10 ° from the vertical direction by the stopper 46. As described above, since the lever 42 is tilted in the same direction as the direction in which the pallet 60 is pulled out onto the elevating platform, the lifting of the pallet can be reliably suppressed.

The guide roller 43 is rotatably supported at the end of the lever 42 and protrudes inward of the lift 15. The upper surface 60 of the pallet pulled out on the lifting platform
a small gap m is provided between the guide roller 43 and the guide roller 43.
0a so as not to become a resistance at the time of drawing.

As shown in FIG. 6, the weight portion 44 is fixed to the other end 42b of the lever 42 by a bolt 47. As shown in FIG. 7, the weight portion 44 is
2 is fixed at an acute angle of 70 ° with respect to
Are in contact with the stopper 46 and are inclined 20 ° from the horizontal direction. Reference numeral 48 denotes a weight fixed to the tip of the weight section 44. Reference numeral 49 denotes a rotating roller provided on the weight 44, which is provided closer to the other end 42b of the lever than the center of the weight 44. As shown in FIG. 8, the rotating roller 49 is supported so as to protrude toward the guide roller 43 in a plan view.
When the 5 is lowered onto the lower frame 4, it comes into contact with a tip of a rod described later.

The lever 42 and the weight portion 44 rotate to a position indicated by a chain line in FIG. When the contact of the rod is released, the lever 48 and the weight portion 44 rotate in the direction of arrow A and return to the original position by the action of the weight 48.

Reference numeral 50 denotes a pair of rods erected on the lower frame 4 by angles 4a (see FIG. 5). The rod 50 penetrates a hole 15d (see FIGS. 7 and 8) formed in the elevating platform when the elevating platform 15 is lowered onto the lower frame 4, and comes into contact with the rotating roller 49 of the roller unit. Are located in The distal end portion of the rod 50 is formed in a curved shape so that the rod 50 smoothly contacts the rotating roller 49. When the elevator 15 is lowered to the lowermost stage of the lower frame 4, the lever 42 and the weight portion 44
It is designed to rotate to the uppermost position represented by the dashed line in FIG. Reference numeral 51 denotes an adjusting unit for adjusting the height of the rod 50.

Next, the operation of the stacker crane having the above-described configuration will be described with reference to FIGS.

The elevator 15 is moved to a predetermined position on the shelf, and the pallet 60 is hooked by the claws 22 of the drawer body 21. After that, the drawer main body 21 is moved to the side opposite to the shelf 50, and the pallet 60 is pulled out from the shelf 50 onto the elevator 15. Both ends of the upper surface of the pallet pulled out on the lift 15 pass below the guide rollers 43 of the roller unit. At this time, even if the pallet 60 is lifted due to an uneven load acting on the pallet 60, the guide roller 43 of the roller portion reliably presses the pallet 60 up. As a result, the pallet 60 is smoothly pulled out onto the lift 15.

Thereafter, the lift 15 is lowered onto the lower frame 4. Then, as shown in FIG.
Penetrates through the hole 15d of the elevating table, and the tip of the rod 50 contacts the rotating roller 49. Thereafter, as shown in FIG. 11, the lever 42 and the weight portion 44 are rotated by the rod 50 in the direction of arrow C as the elevator 15 descends.
As the elevator 15 descends, the pallet 60 mounted on the elevator 15 comes into contact with the chain conveyor 30 on the lower frame 4.

Thereafter, as shown in FIG.
Is lowered to the lowest stage of the mast, the lever 42 and the weight portion 44 are pivoted to the uppermost position by the rod 50. At this time, the drawer main body 21 is below the conveying surface 30a of the chain conveyor 30, and the nails of the drawer main body (not shown) are disengaged from the pallet 60, and the pallet 60 is transferred to the chain conveyor 30. Accordingly, the upper surface 60a of the pallet rises to a position indicated by a dashed line in FIG. 12 with respect to the lift 15 and the guide roller 43 also rises with respect to the lift by the rotation of the lever 42 and the weight portion 44. As a result, the guide roller 43 does not interfere with the pallet 60.

Thereafter, the drive motor 31 of the chain conveyor 30 is driven to rotate the chain 32 and move the pallet 60 to the station side. At the same time, the pawl 22 of the lifting drawer main body 21 is engaged with the pallet 60. Then, the drawer main body 21 is moved by the reciprocating means 25.
To the station side.

As described above, the pallet 60 pulled out from the shelf 50 passes through the elevating platform 15 and is then delivered to the station via the chain conveyor 30.

As described above, according to the stacker crane of the present embodiment, it is possible to prevent the pallet 60 from lifting due to an uneven load when the pallet is pulled out, and to smoothly pull out the pallet 60. In addition, when the chain conveyor 30 is transferred, the pressing of the pallet 60 is
It can be automatically canceled by 0.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be appropriately modified. For example, the roller section 40 and the rod 50 are not limited to the above-described shapes, and may have other shapes.

[Brief description of the drawings]

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

FIG. 2 is a right side view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is an enlarged front view of an essential part showing a state when the elevator is lowered onto a lower frame.

FIG. 5 is a right side view of FIG. 4;

FIG. 6 is a partially enlarged front view of a roller section.

FIG. 7 is a right side view of FIG. 6;

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is a view of the rod in FIG.

FIG. 10 is an operation explanatory view when the lifting platform is lowered onto the lower frame.

FIG. 11 is an explanatory view of the operation.

FIG. 12 is an explanatory view of the operation.

FIG. 13 is a front view of a stacker crane according to Japanese Patent Application No. 2-161063.

FIG. 14 is a right side view of the same.

FIG. 15 is a plan view of the same.

[Explanation of symbols]

 4 Lower frame 15 Elevator 20 Drawer 30 Chain conveyor 50 Rod 60 Pallet

Claims (2)

(57) [Claims] An elevator that moves up and down along a mast, a conveyor that is provided on a frame below the mast, and that is provided to move up and down on the elevator, and pulls a pallet in and out of the elevator by hooking a pallet. A stacker crane provided with a drawer unit, wherein a roller unit for holding up the pallet when the pallet is pulled out by the drawer unit is provided on the elevator, and
The pallet on the elevator
When transferring to the conveyor on the frame side,
A stacker crane characterized in that a part moves to a position where it does not interfere with a pallet . 2. A lower frame, wherein the elevator is lowered to the lowermost stage of the mast, and when the pallet on the elevator is transferred to the conveyor on the lower frame side, the roller comes into contact with the roller, and the roller is brought into contact with the roller. stacker crane according to claim 1, wherein the rod pushes upwardly against the lifting platform is characterized in that it is erected.