JPH061308U - Stacker crane mast - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the mast is tilted due to the lifting of the lift table, the lift table moves up and down vertically to the floor surface, preventing the storage positions of the lower and upper racks from shifting. To do. [Structure] The guide rail 15 is fixed to the mast 14 while inclining the guide rail 15 in the direction opposite to the direction in which the mast 14 is inclined by the load applied by the elevating table 16. As the lift table 16 rises, the mast 14 bends by δ due to the lifting load and moment load of the lift table, but the guide rail 15 also bends in the same direction, so the lift table 16 moves vertically to the floor surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a single-mast type stacker crane.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, for example, loading and unloading of a load to and from a rack of an automated warehouse is performed by a stacker crane traveling along rails provided in parallel with the rack. The mast of the stacker crane supports a lifting platform so that it can be raised and lowered, and the lifting platform is provided with a slide fork for supporting a load. The lifting platform rises to a predetermined height position of the rack, and at this position, the slide fork projects from the lifting platform to load the load into the rack or take out the load stored in the rack from the rack.

[0003]

[Problems to be solved by the device]

 Especially in the case of a single-mast type stacker crane, when a load is stored in the storage location located on the upper stage of the rack, the moment load due to the weight of the lifting platform increases and the mast bends as the lifting platform of the crane rises. , The loading position of the cargo is displaced from the lower level. When such a load shift occurs, it is necessary to increase the width of the rack or the width of the load receiving member by this amount. In the present invention, even if the mast is tilted because the lift is raised to the upper position of the rack, the lift moves up and down vertically with respect to the floor surface, and the load storage positions in the lower and upper racks are displaced. The purpose is to prevent.

[0004]

[Means for Solving the Problems]

 The mast of the stacker crane according to the present invention is characterized in that the guide rail for guiding the lifting platform is fixed to the mast in a state in which it is tilted in the direction opposite to the direction in which the mast is tilted by the load applied by the lifting platform. .

[0005]

Embodiments The present invention will be described below with reference to illustrated embodiments. FIG. 1 shows a schematic configuration of a single-mast type stacker crane to which an embodiment of the present invention is applied.

The floor rail 11 and the ceiling rail 12 are provided parallel to the rack and guide the stacker lane 13 in the left-right direction in the drawing. That is, the stacker crane 13 travels along the rails 11 and 12, transports the load, and loads and unloads the rack. A guide rail 15 is provided on the mast 14, and the elevating table 16 is supported by the guide rail 15 so as to be vertically movable. The lift 16 is provided with a slide fork 17 for supporting a load. The lift 16 is elevated to a predetermined height position of the rack. At this position, the slide fork 17 projects from the elevating table 16 in a direction perpendicular to the plane of the drawing, and loads / unloads a load into / from a predetermined rack storage location. Although the guide rails 15 appear to extend perpendicularly to the horizontal plane in FIG. 1, as will be described later, strictly speaking, the guide rails 15 are inclined to the opposite side of the lift table 16.

FIG. 2 schematically shows the inclination of the mast 14 due to the load acting by the weight of the lifting platform 16. As shown in this figure, when the lifting platform 16 is at a predetermined height position, the suspension load W and the moment load M of the lifting platform 14 cause the mast 14 to bend by δ as shown by the broken line. Such a bending amount δ becomes larger as the position of the lifting table 16 is higher. Therefore, in this embodiment, the guide rail 15 is tilted in the direction opposite to the bending of the mast 16.

FIG. 3 shows the inclination of the guide rail 15 in this embodiment in an exaggerated manner. As shown in this figure, the guide rail 15 is fixed while being inclined in the direction opposite to the direction in which the lifting platform 16 projects with respect to the mast 14, that is, in the right direction in the figure. Since the rigidity of the mast 14 and the lifting load of the lifting table 16 are known, the amount of deflection δ due to the lifting table lifting load W and the moment load M at each height position of the mast 14 can be obtained by theoretical calculation. That is, the guide rail 15 is provided so as to incline by the bending amount δ in the direction opposite to the bending of the mast 14 by the lifting table 16.

The lift table 16 is supported on the guide rail 15 via four guide rollers 18 so as to be able to move up and down. As the lift base 16 is guided by the guide rails 15 and ascends, the mast 14 bends in the left direction in the figure, but the guide rail 15 also bends in the same manner. However, there is substantially no change from the state in which the lift table 16 is in the lower stage, that is, the lift table 16 moves up and down vertically to the floor surface. Therefore, the storage position of the load does not deviate between the lower and upper racks.

As described above, the present embodiment is constructed by inclining the guide rail 15 in the direction opposite to the direction in which the mast 14 is tilted by the load applied by the lifting platform 16. Therefore, the elevating table 16 is always moved vertically to the floor surface, so that the loading / unloading position of the load with respect to the rack can be prevented from shifting.

[0011]

[Effect of device]

 As described above, according to the present invention, even if the mast is tilted because the lift base is raised to the upper position of the rack, the lift base moves up and down perpendicularly to the floor surface. It is possible to prevent the occurrence of displacement of the storage position of the.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration of a stacker crane to which an embodiment of the present invention is applied.

FIG. 2 is a diagram schematically showing the inclination of the mast due to the load applied by the lifting platform.

FIG. 3 is an exaggerated view showing an inclination of a guide rail according to an embodiment of the present invention.

[Explanation of symbols]

 13 Stacker crane 14 Mast 15 Guide rail 16 Lifting platform

Claims (1)

[Scope of utility model registration request] 1. In a mast of a stacker crane having a guide rail for guiding a lifting platform, the guide rail comprises:
A stacker crane mast that is fixed to the mast in a state in which the mast is tilted in a direction opposite to the direction in which the mast is tilted due to the load applied by the lift.