JPH05221599A - Stacker crane - Google Patents

Abstract

PURPOSE:To provide a stacker crane which is free from elongation like a chain and whose stop position precision of an elevating platform has been improved. CONSTITUTION:A stacker crane provided with an elevating platform 9 elevated along a pair of left and right masts 5 and 6 is characterized in provision with a rack 20 or a ball screw arranged along the masts 5 and 6, and a pinion 30 or a ball nut arranged on the elevating platform 9 and engaged with the rack 20 or the ball screw.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a stacker crane. In particular, the present invention relates to a stacker crane that can improve the stopping accuracy of the lifting platform.

[0002]

2. Description of the Related Art FIG. 5 is a front view showing a conventional stacker crane.

In the figure, 1 is a traveling rail, 2 is a guide rail, and 3 is a traveling machine body traveling along these traveling rails 1 and 2. The traveling machine body 3 includes a lower frame 4 that travels on the traveling rail 1, and a front mast 5 and a rear mast 6 that are erected on the lower frame 4.
And an upper frame 8 fixed to the upper parts of the masts 5 and 6 and moving along the guide rails 2, an elevating table 9 elevating and lowering along the masts 5 and 6, and mounted on the elevating table 9. And a slide fork 9a.

Reference numeral 10 is a traveling device mounted on the lower frame 4, 11 is a lifting device, and 12 is a control panel. Lifting device 1
1 has two chains 1 whose ends are connected to the lifting table 9.
There is a winding mechanism for winding the chains 13 and 14, and a winding mechanism for winding the chains 13 and 14 by the winding mechanism.

Such a stacker crane travels along the traveling rail 1 and the guide rail 2 in parallel with the rack T. Then, the elevating table 9 is moved up and down, and the slide fork 9
A is used to transfer the load to and from the rack T.

[0006]

The above-mentioned conventional stacker crane has the following problems.

The elevating table 9 was suspended from the upper frame 8 by the two chains 13 and 14 and moved up and down by the elevating device 11. Therefore, if the chains 13 and 14 are stretched due to changes over time,
There is a problem that the accuracy of the stop position of the lift 9 is lowered.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a stacker crane which can improve the accuracy of the stop position of the lifting table without causing elongation like a chain.

[0009]

In order to achieve the above-mentioned object, the present invention is a stacker crane provided with an elevating platform that ascends and descends along a pair of left and right masts, and a rack or a rack provided along the masts. A ball screw and a pinion or a ball nut provided on the elevating table and meshing with the rack or the ball screw are provided.

[0010]

Since the stacker crane of the present invention has the above-mentioned structure, it has the following effects.

That is, since the mast is provided with a rack or a ball screw, and the elevating table is provided with a pinion or a ball nut which meshes with the rack or the ball screw, the elevating table is positioned on the mast by these meshing. Will be done.

Therefore, according to the stacker crane of the present invention, it is possible to surely stop the lifting platform at a predetermined position without causing elongation like the chain used conventionally, and to stop the lifting platform. There is an effect that the position accuracy can be improved.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment 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 an enlarged view of a main part of FIG. 1, and FIG. 3 is a view taken in the direction of arrow A in FIG.

In these drawings, the stacker crane of this embodiment is a rack 2 provided along the masts 5 and 6.
0, and a pinion 30 provided on the lifting table 9 and meshing with the rack 20.

The racks 20 are provided along both sides of the masts 5 and 6, respectively. The pinion 30 is arranged so as to sandwich the rack 20 from both sides.

Reference numeral 31 is a motor for driving the pinion 30, which is rotated by a drive signal from the controller 12. Reference numeral 32 is a speed reducer connected to the motor 31. The output shaft 33 of the speed reducer 32 has a sprocket 34,
34 is attached and connected to the sprockets 36, 36 via a chain 35. Sprocket 36,3
6 is connected to the pinion 30 via gearboxes 37, 37.

Therefore, when the motor 31 rotates, the speed reducer 32, the output shaft 33, the sprocket 34, and the chain 3
5, the pinion 30 rotates through the sprocket 36, and the gear box 37, and according to the rotation direction,
The lift base 9 is adapted to move up and down. The speed reducer 32 is provided with a brake (not shown) so that the rotation of the output shaft 33 is fixed when the motor 31 is stopped so that the lift base 9 is not displaced.

As described above, according to the stacker crane of this embodiment, the rack 20 provided on the masts 5 and 6 and the pinion 30 provided on the lifting table 9 mesh with each other.
Since the lift 9 is positioned on the masts 5 and 6, the lift 9 can be stopped at a predetermined position on the shelf.

Therefore, according to the stacker crane of the present embodiment, the elevator 9 can be reliably stopped at a predetermined position without the elongation of the conventionally used chain occurring, and The stop position accuracy can be improved.

FIG. 4 shows another embodiment. In this embodiment, a ball screw 40 is provided along the left and right masts 5 and 6, a ball nut 50 that meshes with the ball screw 40 is provided on the lift table 9, and a drive motor 60 for rotating the ball nut 50 is provided on the lift table 9. It was installed in.

Also in this case, by rotating the ball nut 50 by the drive motor 60, the lifting table 9 can be moved up and down according to the rotation direction, and the accuracy of the stop position of the lifting table 9 can be improved.

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.

[Brief description of drawings]

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

FIG. 2 is an enlarged front view of a main part of FIG.

FIG. 3 is a view on arrow A of FIG.

FIG. 4 is an enlarged front view of essential parts showing another embodiment.

FIG. 5 is a front view showing a conventional stacker crane.

[Explanation of symbols]

 5,6 Mast 9 Lifting table 20 Rack 30 Pinion 40 Ball screw 50 Ball nut

Claims (1)

[Claims] 1. A stacker crane having an elevating table that moves up and down along a pair of left and right masts, wherein the rack or ball screw is provided along the mast, and the rack or ball provided on the elevating table. A stacker crane provided with a pinion or a ball nut that meshes with a screw.